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476 lines
19 KiB
ObjectPascal
476 lines
19 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998 by Florian Klaempfl
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Reads typed constants
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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 ptconst;
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interface
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uses symtable;
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{ this procedure reads typed constants }
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{ sym is only needed for ansi strings }
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{ the assembler label is in the middle (PM) }
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procedure readtypedconst(def : pdef;sym : ptypedconstsym);
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implementation
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uses
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cobjects,globals,scanner,aasm,tree,pass_1,
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hcodegen,types,verbose
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{ parser specific stuff }
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,pbase,pexpr
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{ processor specific stuff }
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{$ifdef i386}
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,i386
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{$endif}
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{$ifdef m68k}
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,m68k
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{$endif}
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;
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{ this procedure reads typed constants }
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procedure readtypedconst(def : pdef;sym : ptypedconstsym);
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var
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p : ptree;
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i,l,strlength : longint;
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ll : plabel;
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s : string;
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ca : pchar;
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aktpos : longint;
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pd : pprocdef;
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hp1,hp2 : pdefcoll;
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value : bestreal;
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{problem with fldt !!
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anyway .valued is not extended !!
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value : double; }
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procedure check_range;
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begin
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if ((p^.value>porddef(def)^.high) or
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(p^.value<porddef(def)^.low)) then
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Message(parser_e_range_check_error);
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end;
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{$R-} {Range check creates problem with init_8bit(-1) !!}
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begin
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case def^.deftype of
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orddef:
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begin
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p:=comp_expr(true);
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do_firstpass(p);
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case porddef(def)^.typ of
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s8bit,
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u8bit : begin
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if not is_constintnode(p) then
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{ is't an int expected }
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Message(cg_e_illegal_expression)
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else
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begin
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datasegment^.concat(new(pai_const,init_8bit(p^.value)));
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check_range;
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end;
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end;
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s32bit : begin
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if not is_constintnode(p) then
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Message(cg_e_illegal_expression)
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else
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begin
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datasegment^.concat(new(pai_const,init_32bit(p^.value)));
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check_range;
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end;
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end;
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u32bit : begin
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if not is_constintnode(p) then
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Message(cg_e_illegal_expression)
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else
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datasegment^.concat(new(pai_const,init_32bit(p^.value)));
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end;
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bool8bit : begin
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if not is_constboolnode(p) then
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Message(cg_e_illegal_expression);
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datasegment^.concat(new(pai_const,init_8bit(p^.value)));
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end;
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uchar : begin
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if not is_constcharnode(p) then
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Message(cg_e_illegal_expression);
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datasegment^.concat(new(pai_const,init_8bit(p^.value)));
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end;
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u16bit,
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s16bit : begin
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if not is_constintnode(p) then
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Message(cg_e_illegal_expression);
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datasegment^.concat(new(pai_const,init_16bit(p^.value)));
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check_range;
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end;
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end;
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disposetree(p);
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end;
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floatdef:
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begin
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p:=comp_expr(true);
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do_firstpass(p);
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if is_constrealnode(p) then
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value:=p^.valued
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else if is_constintnode(p) then
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value:=p^.value
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else
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Message(cg_e_illegal_expression);
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case pfloatdef(def)^.typ of
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s64real : datasegment^.concat(new(pai_double,init(value)));
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s32real : datasegment^.concat(new(pai_single,init(value)));
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s80real : datasegment^.concat(new(pai_extended,init(value)));
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s64bit : datasegment^.concat(new(pai_comp,init(value)));
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f32bit : datasegment^.concat(new(pai_const,init_32bit(trunc(value*65536))));
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else internalerror(18);
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end;
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disposetree(p);
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end;
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pointerdef:
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begin
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p:=comp_expr(true);
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do_firstpass(p);
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{ nil pointer ? }
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if p^.treetype=niln then
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datasegment^.concat(new(pai_const,init_32bit(0)))
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{ maybe pchar ? }
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else
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if (ppointerdef(def)^.definition^.deftype=orddef) and
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(porddef(ppointerdef(def)^.definition)^.typ=uchar) then
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begin
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getlabel(ll);
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datasegment^.concat(new(pai_const,init_symbol(strpnew(lab2str(ll)))));
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datasegment^.concat(new(pai_label,init(ll)));
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{ insert string at the begin }
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if p^.treetype=stringconstn then
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datasegment^.concat(new(pai_string,init(p^.values^+#0)))
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else
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if is_constcharnode(p) then
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datasegment^.concat(new(pai_string,init(char(byte(p^.value))+#0)))
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else
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Message(cg_e_illegal_expression);
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{ insert label }
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end
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else
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if p^.treetype=addrn then
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begin
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if (is_equal(ppointerdef(p^.resulttype)^.definition,ppointerdef(def)^.definition) or
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(is_equal(ppointerdef(p^.resulttype)^.definition,voiddef)) or
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(is_equal(ppointerdef(def)^.definition,voiddef))) and
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(p^.left^.treetype = loadn) then
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begin
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datasegment^.concat(new(pai_const,init_symbol(
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strpnew(p^.left^.symtableentry^.mangledname))));
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maybe_concat_external(p^.left^.symtableentry^.owner,
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p^.left^.symtableentry^.mangledname);
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end
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else
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Message(cg_e_illegal_expression);
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end
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else
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{ allow typeof(Object type)}
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if (p^.treetype=inlinen) and
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(p^.inlinenumber=in_typeof_x) then
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begin
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if (p^.left^.treetype=typen) then
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begin
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datasegment^.concat(new(pai_const,init_symbol(
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strpnew(pobjectdef(p^.left^.resulttype)^.vmt_mangledname))));
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if pobjectdef(p^.left^.resulttype)^.owner^.symtabletype=unitsymtable then
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concat_external(pobjectdef(p^.left^.resulttype)^.vmt_mangledname,EXT_NEAR);
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end
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else
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Message(cg_e_illegal_expression);
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end
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else
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Message(cg_e_illegal_expression);
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disposetree(p);
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end;
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setdef:
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begin
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p:=comp_expr(true);
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do_firstpass(p);
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if p^.treetype=setconstrn then
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begin
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{ we only allow const sets }
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if assigned(p^.left) then
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Message(cg_e_illegal_expression)
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else
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begin
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for l:=0 to def^.savesize-1 do
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datasegment^.concat(new(pai_const,init_8bit(p^.constset^[l])));
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end;
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end
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else
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Message(cg_e_illegal_expression);
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disposetree(p);
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end;
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enumdef:
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begin
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p:=comp_expr(true);
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do_firstpass(p);
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if p^.treetype=ordconstn then
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begin
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if is_equal(p^.resulttype,def) then
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datasegment^.concat(new(pai_const,init_32bit(p^.value)))
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else
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Message(cg_e_illegal_expression);
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end
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else
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Message(cg_e_illegal_expression);
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disposetree(p);
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end;
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stringdef:
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begin
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p:=comp_expr(true);
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do_firstpass(p);
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{ first take care of prefixes for long and ansi strings }
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{$ifdef UseLongString}
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if pstringdef(def)^.string_typ=longstring then
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begin
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{ first write the maximum size }
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datasegment^.concat(new(pai_const,init_32bit(p^.length)))));
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end else
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{$endif UseLongString}
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{$ifdef UseAnsiString}
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if pstringdef(def)^.string_typ=ansistring then
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begin
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{$ifdef debug}
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datasegment^.concat(new(pai_asm_comment,init('Header of ansistring')));
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{$endif debug}
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{ first write the maximum size }
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datasegment^.concat(new(pai_const,init_32bit(pstringdef(def)^.len)));
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{ second write the real length }
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datasegment^.concat(new(pai_const,init_32bit(p^.length)));
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{ redondent with maxlength but who knows ... (PM) }
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{ third write use count (set to -1 for safety ) }
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datasegment^.concat(new(pai_const,init_32bit(-1)));
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if assigned(sym) then
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sym^.really_insert_in_data;
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end;
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{$endif UseAnsiString}
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{ the actual write is independent of the string_typ }
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if p^.treetype=stringconstn then
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begin
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{$ifdef UseAnsiString}
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if p^.length>=def^.size then
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strlength:=def^.size-1
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else
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strlength:=p^.length;
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{ this can also handle longer strings }
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generate_pascii(p^.values,strlength);
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{$else UseAnsiString}
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if length(p^.values^)>=def^.size then
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strlength:=def^.size-1
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else
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strlength:=length(p^.values^);
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generate_ascii(char(strlength)+p^.values^);
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{$endif UseAnsiString}
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end
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else if is_constcharnode(p) then
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begin
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datasegment^.concat(new(pai_string,init(#1+char(byte(p^.value)))));
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strlength:=1;
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end
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else Message(cg_e_illegal_expression);
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if def^.size>strlength then
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begin
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getmem(ca,def^.size-strlength);
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fillchar(ca[0],def^.size-strlength-1,' ');
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ca[def^.size-strlength-1]:=#0;
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{$ifdef UseAnsiString}
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{ this can also handle longer strings }
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generate_pascii(ca,def^.size-strlength);
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{$else UseAnsiString}
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datasegment^.concat(new(pai_string,init_pchar(ca)));
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{$endif UseAnsiString}
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disposetree(p);
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end;
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end;
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arraydef:
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begin
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if token=LKLAMMER then
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begin
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consume(LKLAMMER);
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for l:=parraydef(def)^.lowrange to parraydef(def)^.highrange-1 do
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begin
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readtypedconst(parraydef(def)^.definition,nil);
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consume(COMMA);
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end;
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readtypedconst(parraydef(def)^.definition,nil);
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consume(RKLAMMER);
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end
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else
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begin
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p:=comp_expr(true);
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do_firstpass(p);
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if p^.treetype=stringconstn then
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s:=p^.values^
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else if is_constcharnode(p) then
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s:=char(byte(p^.value))
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else Message(cg_e_illegal_expression);
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l:=length(s);
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for i:=Parraydef(def)^.lowrange to Parraydef(def)^.highrange do
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begin
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if i+1-Parraydef(def)^.lowrange<=l then
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begin
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datasegment^.concat(new(pai_const,init_8bit(byte(s[1]))));
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delete(s,1,1);
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end
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else
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{Fill the remaining positions with #0.}
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datasegment^.concat(new(pai_const,init_8bit(0)));
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end;
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if length(s)>0 then
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Message(parser_e_string_too_long);
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end;
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end;
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procvardef:
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begin
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{ Procvars and pointers are no longer compatible. }
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{ under tp: =nil or =var under fpc: =nil or =@var }
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if token=_NIL then
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begin
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datasegment^.concat(new(pai_const,init_32bit(0)));
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consume(_NIL);
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exit;
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end
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else
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if not(cs_tp_compatible in aktswitches) then
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if token=KLAMMERAFFE then
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consume(KLAMMERAFFE);
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getsym(pattern,true);
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consume(ID);
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if srsym^.typ=unitsym then
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begin
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consume(POINT);
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getsymonlyin(punitsym(srsym)^.unitsymtable,pattern);
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consume(ID);
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end;
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if srsym^.typ<>procsym then
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Message(cg_e_illegal_expression)
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else
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begin
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pd:=pprocsym(srsym)^.definition;
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if assigned(pd^.nextoverloaded) then
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Message(parser_e_no_overloaded_procvars);
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if not((pprocvardef(def)^.options=pd^.options)) or
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not(is_equal(pprocvardef(def)^.retdef,pd^.retdef)) then
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Message(sym_e_type_mismatch)
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else
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begin
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hp1:=pprocvardef(def)^.para1;
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hp2:=pd^.para1;
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while assigned(hp1) and assigned(hp2) do
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begin
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if not(is_equal(hp1^.data,hp2^.data)) or
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not(hp1^.paratyp=hp2^.paratyp) then
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begin
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Message(sym_e_type_mismatch);
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break;
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end;
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hp1:=hp1^.next;
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hp2:=hp2^.next;
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end;
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if not((hp1=nil) and (hp2=nil)) then
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Message(sym_e_type_mismatch);
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end;
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datasegment^.concat(new(pai_const,init_symbol(strpnew(pd^.mangledname))));
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if pd^.owner^.symtabletype=unitsymtable then
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concat_external(pd^.mangledname,EXT_NEAR);
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end;
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end;
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{ reads a typed constant record }
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recorddef:
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begin
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consume(LKLAMMER);
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aktpos:=0;
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while token<>RKLAMMER do
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begin
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s:=pattern;
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consume(ID);
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consume(COLON);
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srsym:=precdef(def)^.symtable^.search(s);
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if srsym=nil then
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begin
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Message1(sym_e_id_not_found,s);
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consume_all_until(SEMICOLON);
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end
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else
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begin
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{ check position }
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if pvarsym(srsym)^.address<aktpos then
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Message(parser_e_invalid_record_const);
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{ if needed fill }
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if pvarsym(srsym)^.address>aktpos then
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for i:=1 to pvarsym(srsym)^.address-aktpos do
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datasegment^.concat(new(pai_const,init_8bit(0)));
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{ new position }
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aktpos:=pvarsym(srsym)^.address+pvarsym(srsym)^.definition^.size;
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{ read the data }
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readtypedconst(pvarsym(srsym)^.definition,nil);
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if token=SEMICOLON then
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consume(SEMICOLON)
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else break;
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end;
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end;
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for i:=1 to def^.size-aktpos do
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datasegment^.concat(new(pai_const,init_8bit(0)));
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consume(RKLAMMER);
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end;
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else Message(parser_e_type_const_not_possible);
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end;
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end;
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end.
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{
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$Log$
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Revision 1.6 1998-06-08 22:59:52 peter
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* smartlinking works for win32
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* some defines to exclude some compiler parts
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Revision 1.5 1998/06/03 22:49:01 peter
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+ wordbool,longbool
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* rename bis,von -> high,low
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* moved some systemunit loading/creating to psystem.pas
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Revision 1.4 1998/05/05 12:05:42 florian
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* problems with properties fixed
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* crash fixed: i:=l when i and l are undefined, was a problem with
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implementation of private/protected
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Revision 1.3 1998/04/29 10:34:00 pierre
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+ added some code for ansistring (not complete nor working yet)
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* corrected operator overloading
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* corrected nasm output
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+ started inline procedures
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+ added starstarn : use ** for exponentiation (^ gave problems)
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+ started UseTokenInfo cond to get accurate positions
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}
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