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1035 lines
37 KiB
ObjectPascal
1035 lines
37 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998-2000 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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{$i defines.inc}
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interface
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uses
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tokens,
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node,
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symtype,symdef;
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type
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Ttok2nodeRec=record
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tok : ttoken;
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nod : tnodetype;
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op_overloading_supported : boolean;
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end;
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const
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tok2nodes=25;
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tok2node:array[1..tok2nodes] of ttok2noderec=(
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(tok:_PLUS ;nod:addn;op_overloading_supported:true), { binary overloading supported }
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(tok:_MINUS ;nod:subn;op_overloading_supported:true), { binary and unary overloading supported }
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(tok:_STAR ;nod:muln;op_overloading_supported:true), { binary overloading supported }
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(tok:_SLASH ;nod:slashn;op_overloading_supported:true), { binary overloading supported }
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(tok:_EQUAL ;nod:equaln;op_overloading_supported:true), { binary overloading supported }
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(tok:_GT ;nod:gtn;op_overloading_supported:true), { binary overloading supported }
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(tok:_LT ;nod:ltn;op_overloading_supported:true), { binary overloading supported }
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(tok:_GTE ;nod:gten;op_overloading_supported:true), { binary overloading supported }
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(tok:_LTE ;nod:lten;op_overloading_supported:true), { binary overloading supported }
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(tok:_SYMDIF ;nod:symdifn;op_overloading_supported:true), { binary overloading supported }
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(tok:_STARSTAR;nod:starstarn;op_overloading_supported:true), { binary overloading supported }
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(tok:_OP_AS ;nod:asn;op_overloading_supported:false), { binary overloading NOT supported }
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(tok:_OP_IN ;nod:inn;op_overloading_supported:false), { binary overloading NOT supported }
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(tok:_OP_IS ;nod:isn;op_overloading_supported:false), { binary overloading NOT supported }
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(tok:_OP_OR ;nod:orn;op_overloading_supported:true), { binary overloading supported }
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(tok:_OP_AND ;nod:andn;op_overloading_supported:true), { binary overloading supported }
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(tok:_OP_DIV ;nod:divn;op_overloading_supported:true), { binary overloading supported }
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(tok:_OP_NOT ;nod:notn;op_overloading_supported:true), { unary overloading supported }
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(tok:_OP_MOD ;nod:modn;op_overloading_supported:true), { binary overloading supported }
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(tok:_OP_SHL ;nod:shln;op_overloading_supported:true), { binary overloading supported }
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(tok:_OP_SHR ;nod:shrn;op_overloading_supported:true), { binary overloading supported }
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(tok:_OP_XOR ;nod:xorn;op_overloading_supported:true), { binary overloading supported }
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(tok:_ASSIGNMENT;nod:assignn;op_overloading_supported:true), { unary overloading supported }
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(tok:_CARET ;nod:caretn;op_overloading_supported:false), { binary overloading NOT supported }
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(tok:_UNEQUAL ;nod:unequaln;op_overloading_supported:false) { binary overloading NOT supported overload = instead }
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);
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const
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{ firstcallparan without varspez we don't count the ref }
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{$ifdef extdebug}
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count_ref : boolean = true;
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{$endif def extdebug}
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get_para_resulttype : boolean = false;
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allow_array_constructor : boolean = false;
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{ is overloading of this operator allowed for this
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binary operator }
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function isbinaryoperatoroverloadable(ld, rd,dd : tdef;
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treetyp : tnodetype) : boolean;
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{ is overloading of this operator allowed for this
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unary operator }
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function isunaryoperatoroverloadable(rd,dd : tdef;
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treetyp : tnodetype) : boolean;
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{ check operator args and result type }
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function isoperatoracceptable(pf : tprocdef; optoken : ttoken) : boolean;
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function isbinaryoverloaded(var t : tnode) : boolean;
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{ Register Allocation }
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procedure make_not_regable(p : tnode);
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procedure calcregisters(p : tbinarynode;r32,fpu,mmx : word);
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{ subroutine handling }
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procedure test_protected_sym(sym : tsym);
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procedure test_protected(p : tnode);
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function is_procsym_load(p:tnode):boolean;
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function is_procsym_call(p:tnode):boolean;
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procedure test_local_to_procvar(from_def:tprocvardef;to_def:tdef);
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{
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type
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tvarstaterequire = (vsr_can_be_undefined,vsr_must_be_valid,
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vsr_is_used_after,vsr_must_be_valid_and_is_used_after); }
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{ sets varsym varstate field correctly }
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procedure unset_varstate(p : tnode);
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procedure set_varstate(p : tnode;must_be_valid : boolean);
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{ sets the callunique flag, if the node is a vecn, }
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{ takes care of type casts etc. }
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procedure set_unique(p : tnode);
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{ sets funcret_is_valid to true, if p contains a funcref node }
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procedure set_funcret_is_valid(p : tnode);
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function valid_for_formal_var(p : tnode) : boolean;
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function valid_for_formal_const(p : tnode) : boolean;
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function valid_for_var(p:tnode):boolean;
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function valid_for_assignment(p:tnode):boolean;
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implementation
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uses
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globtype,systems,
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cutils,verbose,globals,
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symconst,symsym,symtable,
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types,cpubase,
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ncnv,nld,
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nmem,ncal,nmat,
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{$ifdef newcg}
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cgbase
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{$else}
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hcodegen
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{$endif}
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;
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type
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TValidAssign=(Valid_Property,Valid_Void);
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TValidAssigns=set of TValidAssign;
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{ ld is the left type definition
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rd the right type definition
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dd the result type definition or voiddef if unkown }
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function isbinaryoperatoroverloadable(ld, rd, dd : tdef;
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treetyp : tnodetype) : boolean;
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begin
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isbinaryoperatoroverloadable:=
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(treetyp=starstarn) or
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(ld.deftype=recorddef) or
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(rd.deftype=recorddef) or
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(ld.deftype=variantdef) or
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(rd.deftype=variantdef) or
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((rd.deftype=pointerdef) and
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not(is_pchar(rd) and
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(is_chararray(ld) or
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(ld.deftype=stringdef) or
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(treetyp=addn))) and
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(not(ld.deftype in [pointerdef,objectdef,classrefdef,procvardef]) or
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not (treetyp in [equaln,unequaln,gtn,gten,ltn,lten,subn])
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) and
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(not is_integer(ld) or not (treetyp in [addn,subn]))
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) or
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((ld.deftype=pointerdef) and
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not(is_pchar(ld) and
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(is_chararray(rd) or
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(rd.deftype=stringdef) or
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(treetyp=addn))) and
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(not(rd.deftype in [stringdef,pointerdef,objectdef,classrefdef,procvardef]) and
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((not is_integer(rd) and (rd.deftype<>objectdef)
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and (rd.deftype<>classrefdef)) or
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not (treetyp in [equaln,unequaln,gtn,gten,ltn,lten,addn,subn])
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)
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)
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) or
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{ array def, but not mmx or chararray+[char,string,chararray] }
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((ld.deftype=arraydef) and
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not((cs_mmx in aktlocalswitches) and
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is_mmx_able_array(ld)) and
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not(is_chararray(ld) and
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(is_char(rd) or
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is_pchar(rd) or
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{ char array + int = pchar + int, fix for web bug 1377 (JM) }
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is_integer(rd) or
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(rd.deftype=stringdef) or
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is_chararray(rd)))
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) or
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((rd.deftype=arraydef) and
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not((cs_mmx in aktlocalswitches) and
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is_mmx_able_array(rd)) and
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not(is_chararray(rd) and
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(is_char(ld) or
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is_pchar(ld) or
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(ld.deftype=stringdef) or
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is_chararray(ld)))
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) or
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{ <> and = are defined for classes }
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(
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(ld.deftype=objectdef) and
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not((treetyp in [equaln,unequaln]) and is_class_or_interface(ld))
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) or
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(
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(rd.deftype=objectdef) and
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not((treetyp in [equaln,unequaln]) and is_class_or_interface(rd))
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)
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or
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{ allow other operators that + on strings }
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(
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(is_char(rd) or
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is_pchar(rd) or
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(rd.deftype=stringdef) or
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is_chararray(rd) or
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is_char(ld) or
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is_pchar(ld) or
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(ld.deftype=stringdef) or
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is_chararray(ld)
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) and
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not(treetyp in [addn,equaln,unequaln,gtn,gten,ltn,lten]) and
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not(is_pchar(ld) and
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(is_integer(rd) or (rd.deftype=pointerdef)) and
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(treetyp=subn)
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)
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);
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end;
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function isunaryoperatoroverloadable(rd,dd : tdef;
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treetyp : tnodetype) : boolean;
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begin
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isunaryoperatoroverloadable:=false;
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{ what assignment overloading should be allowed ?? }
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if (treetyp=assignn) then
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begin
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isunaryoperatoroverloadable:=true;
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{ this already get tbs0261 to fail
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isunaryoperatoroverloadable:=not is_equal(rd,dd); PM }
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end
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{ should we force that rd and dd are equal ?? }
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else if (treetyp=subn { unaryminusn }) then
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begin
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isunaryoperatoroverloadable:=
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not is_integer(rd) and not (rd.deftype=floatdef)
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{$ifdef SUPPORT_MMX}
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and not ((cs_mmx in aktlocalswitches) and
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is_mmx_able_array(rd))
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{$endif SUPPORT_MMX}
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;
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end
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else if (treetyp=notn) then
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begin
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isunaryoperatoroverloadable:=not is_integer(rd) and not is_boolean(rd)
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{$ifdef SUPPORT_MMX}
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and not ((cs_mmx in aktlocalswitches) and
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is_mmx_able_array(rd))
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{$endif SUPPORT_MMX}
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;
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end;
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end;
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function isoperatoracceptable(pf : tprocdef; optoken : ttoken) : boolean;
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var
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ld,rd,dd : tdef;
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i : longint;
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begin
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case pf.parast.symindex.count of
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2 : begin
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isoperatoracceptable:=false;
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for i:=1 to tok2nodes do
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if tok2node[i].tok=optoken then
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begin
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ld:=tvarsym(pf.parast.symindex.first).vartype.def;
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rd:=tvarsym(pf.parast.symindex.first.indexnext).vartype.def;
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dd:=pf.rettype.def;
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isoperatoracceptable:=
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tok2node[i].op_overloading_supported and
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isbinaryoperatoroverloadable(ld,rd,dd,tok2node[i].nod);
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break;
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end;
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end;
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1 : begin
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rd:=tvarsym(pf.parast.symindex.first).vartype.def;
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dd:=pf.rettype.def;
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for i:=1 to tok2nodes do
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if tok2node[i].tok=optoken then
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begin
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isoperatoracceptable:=
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tok2node[i].op_overloading_supported and
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isunaryoperatoroverloadable(rd,dd,tok2node[i].nod);
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break;
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end;
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end;
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else
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isoperatoracceptable:=false;
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end;
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end;
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function isbinaryoverloaded(var t : tnode) : boolean;
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var
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rd,ld : tdef;
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optoken : ttoken;
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ht : tnode;
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begin
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isbinaryoverloaded:=false;
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{ overloaded operator ? }
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{ load easier access variables }
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rd:=tbinarynode(t).right.resulttype.def;
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ld:=tbinarynode(t).left.resulttype.def;
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if isbinaryoperatoroverloadable(ld,rd,voidtype.def,t.nodetype) then
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begin
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isbinaryoverloaded:=true;
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{!!!!!!!!! handle paras }
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case t.nodetype of
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addn:
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optoken:=_PLUS;
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subn:
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optoken:=_MINUS;
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muln:
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optoken:=_STAR;
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starstarn:
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optoken:=_STARSTAR;
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slashn:
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optoken:=_SLASH;
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ltn:
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optoken:=tokens._lt;
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gtn:
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optoken:=tokens._gt;
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lten:
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optoken:=_lte;
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gten:
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optoken:=_gte;
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equaln,unequaln :
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optoken:=_EQUAL;
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symdifn :
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optoken:=_SYMDIF;
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modn :
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optoken:=_OP_MOD;
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orn :
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optoken:=_OP_OR;
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xorn :
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optoken:=_OP_XOR;
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andn :
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optoken:=_OP_AND;
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divn :
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optoken:=_OP_DIV;
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shln :
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optoken:=_OP_SHL;
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shrn :
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optoken:=_OP_SHR;
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else
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exit;
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end;
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{ the nil as symtable signs firstcalln that this is
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an overloaded operator }
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ht:=ccallnode.create(nil,overloaded_operators[optoken],nil,nil);
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{ we have to convert p^.left and p^.right into
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callparanodes }
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if tcallnode(ht).symtableprocentry=nil then
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begin
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CGMessage(parser_e_operator_not_overloaded);
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ht.free;
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isbinaryoverloaded:=false;
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exit;
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end;
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inc(tcallnode(ht).symtableprocentry.refs);
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{ we need copies, because the originals will be destroyed when we give a }
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{ changed node back to firstpass! (JM) }
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if assigned(tbinarynode(t).left) then
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if assigned(tbinarynode(t).right) then
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tcallnode(ht).left :=
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ccallparanode.create(tbinarynode(t).right.getcopy,
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ccallparanode.create(tbinarynode(t).left.getcopy,nil))
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else
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tcallnode(ht).left :=
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ccallparanode.create(nil,
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ccallparanode.create(tbinarynode(t).left.getcopy,nil))
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else if assigned(tbinarynode(t).right) then
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tcallnode(ht).left :=
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ccallparanode.create(tbinarynode(t).right.getcopy,
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ccallparanode.create(nil,nil));
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if t.nodetype=unequaln then
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ht:=cnotnode.create(ht);
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t:=ht;
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end;
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end;
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{****************************************************************************
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Register Calculation
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****************************************************************************}
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{ marks an lvalue as "unregable" }
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procedure make_not_regable(p : tnode);
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begin
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case p.nodetype of
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typeconvn :
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make_not_regable(ttypeconvnode(p).left);
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loadn :
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if tloadnode(p).symtableentry.typ=varsym then
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tvarsym(tloadnode(p).symtableentry).varoptions:=tvarsym(tloadnode(p).symtableentry).varoptions-[vo_regable,vo_fpuregable];
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end;
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end;
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{ calculates the needed registers for a binary operator }
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procedure calcregisters(p : tbinarynode;r32,fpu,mmx : word);
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begin
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p.left_right_max;
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{ Only when the difference between the left and right registers < the
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wanted registers allocate the amount of registers }
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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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if (abs(p.left.registers32-p.right.registers32)<r32) then
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inc(p.registers32,r32);
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if (abs(p.left.registersfpu-p.right.registersfpu)<fpu) then
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inc(p.registersfpu,fpu);
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{$ifdef SUPPORT_MMX}
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if (abs(p.left.registersmmx-p.right.registersmmx)<mmx) then
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inc(p.registersmmx,mmx);
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{$endif SUPPORT_MMX}
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{ the following is a little bit guessing but I think }
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{ it's the only way to solve same internalerrors: }
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{ if the left and right node both uses registers }
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{ and return a mem location, but the current node }
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{ doesn't use an integer register we get probably }
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{ trouble when restoring a node }
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if (p.left.registers32=p.right.registers32) and
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(p.registers32=p.left.registers32) and
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(p.registers32>0) and
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(p.left.location.loc in [LOC_REFERENCE,LOC_MEM]) and
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(p.right.location.loc in [LOC_REFERENCE,LOC_MEM]) then
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inc(p.registers32);
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end
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else
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begin
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if (p.left.registers32<r32) then
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inc(p.registers32,r32);
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if (p.left.registersfpu<fpu) then
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inc(p.registersfpu,fpu);
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{$ifdef SUPPORT_MMX}
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if (p.left.registersmmx<mmx) then
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inc(p.registersmmx,mmx);
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{$endif SUPPORT_MMX}
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end;
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end;
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|
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{ error CGMessage, if more than 8 floating point }
|
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{ registers are needed }
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if p.registersfpu>maxfpuregs then
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CGMessage(cg_e_too_complex_expr);
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end;
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|
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{****************************************************************************
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Subroutine Handling
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****************************************************************************}
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|
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{ protected field handling
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protected field can not appear in
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var parameters of function !!
|
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this can only be done after we have determined the
|
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overloaded function
|
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this is the reason why it is not in the parser, PM }
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|
|
procedure test_protected_sym(sym : tsym);
|
|
begin
|
|
if (sp_protected in sym.symoptions) and
|
|
(
|
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(
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(sym.owner.symtabletype=globalsymtable) and
|
|
(sym.owner.unitid<>0)
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) or
|
|
(
|
|
(sym.owner.symtabletype=objectsymtable) and
|
|
(tobjectdef(sym.owner.defowner).owner.symtabletype=globalsymtable) and
|
|
(tobjectdef(sym.owner.defowner).owner.unitid<>0)
|
|
)
|
|
) then
|
|
CGMessage(parser_e_cant_access_protected_member);
|
|
end;
|
|
|
|
|
|
procedure test_protected(p : tnode);
|
|
begin
|
|
case p.nodetype of
|
|
loadn : test_protected_sym(tloadnode(p).symtableentry);
|
|
typeconvn : test_protected(ttypeconvnode(p).left);
|
|
derefn : test_protected(tderefnode(p).left);
|
|
subscriptn : begin
|
|
{ test_protected(p.left);
|
|
Is a field of a protected var
|
|
also protected ??? PM }
|
|
test_protected_sym(tsubscriptnode(p).vs);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
function is_procsym_load(p:tnode):boolean;
|
|
begin
|
|
is_procsym_load:=((p.nodetype=loadn) and (tloadnode(p).symtableentry.typ=procsym)) or
|
|
((p.nodetype=addrn) and (taddrnode(p).left.nodetype=loadn)
|
|
and (tloadnode(taddrnode(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:tnode):boolean;
|
|
begin
|
|
is_procsym_call:=(p.nodetype=calln) and (tcallnode(p).left=nil) and
|
|
(((tcallnode(p).symtableprocentry.typ=procsym) and (tcallnode(p).right=nil)) or
|
|
(assigned(tcallnode(p).right) and (tcallnode(tcallnode(p).right).symtableprocentry.typ=varsym)));
|
|
end;
|
|
|
|
|
|
{ local routines can't be assigned to procvars }
|
|
procedure test_local_to_procvar(from_def:tprocvardef;to_def:tdef);
|
|
begin
|
|
if (from_def.symtablelevel>1) and (to_def.deftype=procvardef) then
|
|
CGMessage(type_e_cannot_local_proc_to_procvar);
|
|
end;
|
|
|
|
|
|
procedure set_varstate(p : tnode;must_be_valid : boolean);
|
|
var
|
|
hsym : tvarsym;
|
|
begin
|
|
while assigned(p) do
|
|
begin
|
|
if (nf_varstateset in p.flags) then
|
|
exit;
|
|
include(p.flags,nf_varstateset);
|
|
case p.nodetype of
|
|
typeconvn :
|
|
begin
|
|
case ttypeconvnode(p).convtype of
|
|
tc_cchar_2_pchar,
|
|
tc_cstring_2_pchar,
|
|
tc_array_2_pointer :
|
|
must_be_valid:=false;
|
|
tc_pchar_2_string,
|
|
tc_pointer_2_array :
|
|
must_be_valid:=true;
|
|
end;
|
|
p:=tunarynode(p).left;
|
|
end;
|
|
subscriptn :
|
|
p:=tunarynode(p).left;
|
|
vecn:
|
|
begin
|
|
set_varstate(tbinarynode(p).right,true);
|
|
if not(tunarynode(p).left.resulttype.def.deftype in [stringdef,arraydef]) then
|
|
must_be_valid:=true;
|
|
p:=tunarynode(p).left;
|
|
end;
|
|
{ do not parse calln }
|
|
calln :
|
|
break;
|
|
callparan :
|
|
begin
|
|
set_varstate(tbinarynode(p).right,must_be_valid);
|
|
p:=tunarynode(p).left;
|
|
end;
|
|
loadn :
|
|
begin
|
|
if (tloadnode(p).symtableentry.typ=varsym) then
|
|
begin
|
|
hsym:=tvarsym(tloadnode(p).symtableentry);
|
|
if must_be_valid and (nf_first in p.flags) then
|
|
begin
|
|
if (hsym.varstate=vs_declared_and_first_found) or
|
|
(hsym.varstate=vs_set_but_first_not_passed) then
|
|
begin
|
|
if (assigned(hsym.owner) and
|
|
assigned(aktprocsym) and
|
|
(hsym.owner = aktprocsym.definition.localst)) then
|
|
begin
|
|
if tloadnode(p).symtable.symtabletype=localsymtable then
|
|
CGMessage1(sym_n_uninitialized_local_variable,hsym.realname)
|
|
else
|
|
CGMessage1(sym_n_uninitialized_variable,hsym.realname);
|
|
end;
|
|
end;
|
|
end;
|
|
if (nf_first in p.flags) then
|
|
begin
|
|
if hsym.varstate=vs_declared_and_first_found then
|
|
begin
|
|
{ this can only happen at left of an assignment, no ? PM }
|
|
if (parsing_para_level=0) and not must_be_valid then
|
|
hsym.varstate:=vs_assigned
|
|
else
|
|
hsym.varstate:=vs_used;
|
|
end
|
|
else
|
|
if hsym.varstate=vs_set_but_first_not_passed then
|
|
hsym.varstate:=vs_used;
|
|
exclude(p.flags,nf_first);
|
|
end
|
|
else
|
|
begin
|
|
if (hsym.varstate=vs_assigned) and
|
|
(must_be_valid or (parsing_para_level>0) or
|
|
(p.resulttype.def.deftype=procvardef)) then
|
|
hsym.varstate:=vs_used;
|
|
if (hsym.varstate=vs_declared_and_first_found) and
|
|
(must_be_valid or (parsing_para_level>0) or
|
|
(p.resulttype.def.deftype=procvardef)) then
|
|
hsym.varstate:=vs_set_but_first_not_passed;
|
|
end;
|
|
end;
|
|
break;
|
|
end;
|
|
funcretn:
|
|
begin
|
|
{ no claim if setting higher return value_str }
|
|
if must_be_valid and
|
|
(procinfo=pprocinfo(tfuncretnode(p).funcretprocinfo)) and
|
|
((procinfo^.funcret_state=vs_declared) or
|
|
((nf_is_first_funcret in p.flags) and
|
|
(procinfo^.funcret_state=vs_declared_and_first_found))) then
|
|
begin
|
|
CGMessage(sym_w_function_result_not_set);
|
|
{ avoid multiple warnings }
|
|
procinfo^.funcret_state:=vs_assigned;
|
|
end;
|
|
if (nf_is_first_funcret in p.flags) and not must_be_valid then
|
|
pprocinfo(tfuncretnode(p).funcretprocinfo)^.funcret_state:=vs_assigned;
|
|
break;
|
|
end;
|
|
else
|
|
break;
|
|
end;{case }
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure unset_varstate(p : tnode);
|
|
begin
|
|
while assigned(p) do
|
|
begin
|
|
exclude(p.flags,nf_varstateset);
|
|
case p.nodetype of
|
|
typeconvn,
|
|
subscriptn,
|
|
vecn :
|
|
p:=tunarynode(p).left;
|
|
else
|
|
break;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure set_unique(p : tnode);
|
|
begin
|
|
while assigned(p) do
|
|
begin
|
|
case p.nodetype of
|
|
vecn:
|
|
begin
|
|
include(p.flags,nf_callunique);
|
|
break;
|
|
end;
|
|
typeconvn,
|
|
subscriptn,
|
|
derefn:
|
|
p:=tunarynode(p).left;
|
|
else
|
|
break;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure set_funcret_is_valid(p:tnode);
|
|
begin
|
|
while assigned(p) do
|
|
begin
|
|
case p.nodetype of
|
|
funcretn:
|
|
begin
|
|
if (nf_is_first_funcret in p.flags) then
|
|
pprocinfo(tfuncretnode(p).funcretprocinfo)^.funcret_state:=vs_assigned;
|
|
break;
|
|
end;
|
|
vecn,
|
|
{derefn,}
|
|
typeconvn,
|
|
subscriptn:
|
|
p:=tunarynode(p).left;
|
|
else
|
|
break;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
function valid_for_assign(p:tnode;opts:TValidAssigns):boolean;
|
|
var
|
|
hp : tnode;
|
|
gotwith,
|
|
gotsubscript,
|
|
gotpointer,
|
|
gotclass,
|
|
gotderef : boolean;
|
|
begin
|
|
valid_for_assign:=false;
|
|
gotsubscript:=false;
|
|
gotderef:=false;
|
|
gotclass:=false;
|
|
gotpointer:=false;
|
|
gotwith:=false;
|
|
hp:=p;
|
|
if not(valid_void in opts) and
|
|
is_void(hp.resulttype.def) then
|
|
begin
|
|
CGMessagePos(hp.fileinfo,type_e_argument_cant_be_assigned);
|
|
exit;
|
|
end;
|
|
while assigned(hp) do
|
|
begin
|
|
{ property allowed? calln has a property check itself }
|
|
if (nf_isproperty in hp.flags) then
|
|
begin
|
|
if (valid_property in opts) then
|
|
valid_for_assign:=true
|
|
else
|
|
begin
|
|
{ check return type }
|
|
case hp.resulttype.def.deftype of
|
|
pointerdef :
|
|
gotpointer:=true;
|
|
objectdef :
|
|
gotclass:=is_class_or_interface(hp.resulttype.def);
|
|
recorddef, { handle record like class it needs a subscription }
|
|
classrefdef :
|
|
gotclass:=true;
|
|
end;
|
|
{ 1. if it returns a pointer and we've found a deref,
|
|
2. if it returns a class or record and a subscription or with is found }
|
|
if (gotpointer and gotderef) or
|
|
(gotclass and (gotsubscript or gotwith)) then
|
|
valid_for_assign:=true
|
|
else
|
|
CGMessagePos(hp.fileinfo,type_e_argument_cant_be_assigned);
|
|
end;
|
|
exit;
|
|
end;
|
|
case hp.nodetype of
|
|
derefn :
|
|
begin
|
|
gotderef:=true;
|
|
hp:=tderefnode(hp).left;
|
|
end;
|
|
typeconvn :
|
|
begin
|
|
case hp.resulttype.def.deftype of
|
|
pointerdef :
|
|
gotpointer:=true;
|
|
objectdef :
|
|
gotclass:=is_class_or_interface(hp.resulttype.def);
|
|
classrefdef :
|
|
gotclass:=true;
|
|
arraydef :
|
|
begin
|
|
{ pointer -> array conversion is done then we need to see it
|
|
as a deref, because a ^ is then not required anymore }
|
|
if (ttypeconvnode(hp).left.resulttype.def.deftype=pointerdef) then
|
|
gotderef:=true;
|
|
end;
|
|
end;
|
|
hp:=ttypeconvnode(hp).left;
|
|
end;
|
|
vecn,
|
|
asn :
|
|
hp:=tunarynode(hp).left;
|
|
subscriptn :
|
|
begin
|
|
gotsubscript:=true;
|
|
{ a class/interface access is an implicit }
|
|
{ dereferencing }
|
|
hp:=tsubscriptnode(hp).left;
|
|
if is_class_or_interface(hp.resulttype.def) then
|
|
gotderef:=true;
|
|
end;
|
|
subn,
|
|
addn :
|
|
begin
|
|
{ Allow add/sub operators on a pointer, or an integer
|
|
and a pointer typecast and deref has been found }
|
|
if (hp.resulttype.def.deftype=pointerdef) or
|
|
(is_integer(hp.resulttype.def) and gotpointer and gotderef) then
|
|
valid_for_assign:=true
|
|
else
|
|
CGMessagePos(hp.fileinfo,type_e_variable_id_expected);
|
|
exit;
|
|
end;
|
|
addrn :
|
|
begin
|
|
if gotderef or
|
|
(nf_procvarload in hp.flags) then
|
|
valid_for_assign:=true
|
|
else
|
|
CGMessagePos(hp.fileinfo,type_e_no_assign_to_addr);
|
|
exit;
|
|
end;
|
|
selfn,
|
|
funcretn :
|
|
begin
|
|
valid_for_assign:=true;
|
|
exit;
|
|
end;
|
|
calln :
|
|
begin
|
|
{ check return type }
|
|
case hp.resulttype.def.deftype of
|
|
pointerdef :
|
|
gotpointer:=true;
|
|
objectdef :
|
|
gotclass:=is_class_or_interface(hp.resulttype.def);
|
|
recorddef, { handle record like class it needs a subscription }
|
|
classrefdef :
|
|
gotclass:=true;
|
|
end;
|
|
{ 1. if it returns a pointer and we've found a deref,
|
|
2. if it returns a class or record and a subscription or with is found }
|
|
if (gotpointer and gotderef) or
|
|
(gotclass and (gotsubscript or gotwith)) then
|
|
valid_for_assign:=true
|
|
else
|
|
CGMessagePos(hp.fileinfo,type_e_argument_cant_be_assigned);
|
|
exit;
|
|
end;
|
|
loadn :
|
|
begin
|
|
case tloadnode(hp).symtableentry.typ of
|
|
absolutesym,
|
|
varsym :
|
|
begin
|
|
if (tvarsym(tloadnode(hp).symtableentry).varspez=vs_const) then
|
|
begin
|
|
{ allow p^:= constructions with p is const parameter }
|
|
if gotderef then
|
|
valid_for_assign:=true
|
|
else
|
|
CGMessagePos(tloadnode(hp).fileinfo,type_e_no_assign_to_const);
|
|
exit;
|
|
end;
|
|
{ Are we at a with symtable, then we need to process the
|
|
withrefnode also to check for maybe a const load }
|
|
if (tloadnode(hp).symtable.symtabletype=withsymtable) then
|
|
begin
|
|
{ continue with processing the withref node }
|
|
hp:=tnode(twithsymtable(tloadnode(hp).symtable).withrefnode);
|
|
gotwith:=true;
|
|
end
|
|
else
|
|
begin
|
|
{ set the assigned flag for varsyms }
|
|
if (tvarsym(tloadnode(hp).symtableentry).varstate=vs_declared) then
|
|
tvarsym(tloadnode(hp).symtableentry).varstate:=vs_assigned;
|
|
valid_for_assign:=true;
|
|
exit;
|
|
end;
|
|
end;
|
|
funcretsym,
|
|
typedconstsym :
|
|
begin
|
|
valid_for_assign:=true;
|
|
exit;
|
|
end;
|
|
end;
|
|
end;
|
|
else
|
|
begin
|
|
CGMessagePos(hp.fileinfo,type_e_variable_id_expected);
|
|
exit;
|
|
end;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
function valid_for_var(p:tnode):boolean;
|
|
begin
|
|
valid_for_var:=valid_for_assign(p,[]);
|
|
end;
|
|
|
|
|
|
function valid_for_formal_var(p : tnode) : boolean;
|
|
begin
|
|
valid_for_formal_var:=valid_for_assign(p,[valid_void]);
|
|
end;
|
|
|
|
|
|
function valid_for_formal_const(p : tnode) : boolean;
|
|
var
|
|
v : boolean;
|
|
begin
|
|
{ p must have been firstpass'd before }
|
|
{ accept about anything but not a statement ! }
|
|
case p.nodetype of
|
|
calln,
|
|
statementn,
|
|
addrn :
|
|
begin
|
|
{ addrn is not allowed as this generate a constant value,
|
|
but a tp procvar are allowed (PFV) }
|
|
if nf_procvarload in p.flags then
|
|
v:=true
|
|
else
|
|
v:=false;
|
|
end;
|
|
else
|
|
v:=true;
|
|
end;
|
|
valid_for_formal_const:=v;
|
|
end;
|
|
|
|
|
|
function valid_for_assignment(p:tnode):boolean;
|
|
begin
|
|
valid_for_assignment:=valid_for_assign(p,[valid_property]);
|
|
end;
|
|
|
|
end.
|
|
{
|
|
$Log$
|
|
Revision 1.29 2001-06-04 18:04:36 peter
|
|
* fixes to valid_for_assign for properties
|
|
|
|
Revision 1.28 2001/06/04 11:48:02 peter
|
|
* better const to var checking
|
|
|
|
Revision 1.27 2001/05/18 22:57:08 peter
|
|
* replace constant by cpu dependent value (merged)
|
|
|
|
Revision 1.26 2001/05/08 08:52:05 jonas
|
|
* fix from Peter to avoid excessive number of warnings
|
|
|
|
Revision 1.25 2001/04/22 22:46:49 florian
|
|
* more variant support
|
|
|
|
Revision 1.24 2001/04/13 01:22:08 peter
|
|
* symtable change to classes
|
|
* range check generation and errors fixed, make cycle DEBUG=1 works
|
|
* memory leaks fixed
|
|
|
|
Revision 1.23 2001/04/02 21:20:29 peter
|
|
* resulttype rewrite
|
|
|
|
Revision 1.22 2001/02/20 21:46:26 peter
|
|
* don't allow assign to void type (merged)
|
|
|
|
Revision 1.21 2001/02/04 11:12:17 jonas
|
|
* fixed web bug 1377 & const pointer arithmtic
|
|
|
|
Revision 1.20 2000/12/09 13:04:05 florian
|
|
* web bug 1207 fixed: field and properties of const classes can be
|
|
changed
|
|
|
|
Revision 1.19 2000/11/29 00:30:31 florian
|
|
* unused units removed from uses clause
|
|
* some changes for widestrings
|
|
|
|
Revision 1.18 2000/11/28 17:14:33 jonas
|
|
* fixed crash when trying to use an overloaded operator which is nowhere
|
|
defined
|
|
|
|
Revision 1.17 2000/11/28 14:04:03 jonas
|
|
* fixed operator overloading problems
|
|
|
|
Revision 1.16 2000/11/13 11:30:54 florian
|
|
* some bugs with interfaces and NIL fixed
|
|
|
|
Revision 1.15 2000/11/12 22:20:37 peter
|
|
* create generic toutputsection for binary writers
|
|
|
|
Revision 1.14 2000/11/04 14:25:19 florian
|
|
+ merged Attila's changes for interfaces, not tested yet
|
|
|
|
Revision 1.13 2000/10/31 22:02:47 peter
|
|
* symtable splitted, no real code changes
|
|
|
|
Revision 1.12 2000/10/14 10:14:47 peter
|
|
* moehrendorf oct 2000 rewrite
|
|
|
|
Revision 1.11 2000/10/01 19:48:23 peter
|
|
* lot of compile updates for cg11
|
|
|
|
Revision 1.10 2000/09/29 15:45:23 florian
|
|
* make cycle fixed
|
|
|
|
Revision 1.9 2000/09/28 19:49:51 florian
|
|
*** empty log message ***
|
|
|
|
Revision 1.8 2000/09/27 18:14:31 florian
|
|
* fixed a lot of syntax errors in the n*.pas stuff
|
|
|
|
Revision 1.7 2000/09/26 20:06:13 florian
|
|
* hmm, still a lot of work to get things compilable
|
|
|
|
Revision 1.6 2000/09/24 15:06:17 peter
|
|
* use defines.inc
|
|
|
|
Revision 1.5 2000/08/27 16:11:51 peter
|
|
* moved some util functions from globals,cobjects to cutils
|
|
* splitted files into finput,fmodule
|
|
|
|
Revision 1.4 2000/08/16 18:33:53 peter
|
|
* splitted namedobjectitem.next into indexnext and listnext so it
|
|
can be used in both lists
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* don't allow "word = word" type definitions (merged)
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Revision 1.3 2000/08/07 11:31:04 jonas
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* fixed bug in type conversions between enum subranges (it didn't take
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the packenum directive into account)
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+ define PACKENUMFIXED symbol in options.pas
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(merged from fixes branch)
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Revision 1.2 2000/07/13 11:32:41 michael
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+ removed logs
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}
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