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30ee3416e8
(the latter via a type cast) variables from which only fields are
read
git-svn-id: trunk@4181 -
2289 lines
85 KiB
ObjectPascal
2289 lines
85 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 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 fpcdefs.inc}
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interface
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uses
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tokens,cpuinfo,
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node,globals,
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symconst,symtype,symdef,symsym,symbase;
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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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pcandidate = ^tcandidate;
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tcandidate = record
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next : pcandidate;
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data : tprocdef;
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wrongparaidx,
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firstparaidx : integer;
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exact_count,
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equal_count,
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cl1_count,
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cl2_count,
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cl3_count,
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coper_count : integer; { should be signed }
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ordinal_distance : bestreal;
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invalid : boolean;
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wrongparanr : byte;
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end;
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tcallcandidates = class
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private
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FProcSym : tprocsym;
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FProcs : pcandidate;
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FProcVisibleCnt,
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FProcCnt : integer;
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FParaNode : tnode;
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FParaLength : smallint;
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FAllowVariant : boolean;
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function proc_add(pd:tprocdef):pcandidate;
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public
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constructor create(sym:tprocsym;st:tsymtable;ppn:tnode;isprop,ignorevis : boolean);
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constructor create_operator(op:ttoken;ppn:tnode);
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destructor destroy;override;
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procedure list(all:boolean);
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{$ifdef EXTDEBUG}
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procedure dump_info(lvl:longint);
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{$endif EXTDEBUG}
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procedure get_information;
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function choose_best(var bestpd:tabstractprocdef):integer;
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procedure find_wrong_para;
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property Count:integer read FProcCnt;
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property VisibleCount:integer read FProcVisibleCnt;
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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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allow_array_constructor : boolean = false;
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function node2opstr(nt:tnodetype):string;
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{ check operator args and result type }
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function isbinaryoperatoroverloadable(treetyp:tnodetype;ld:tdef;lt:tnodetype;rd:tdef;rt:tnodetype) : boolean;
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function isoperatoracceptable(pf : tprocdef; optoken : ttoken) : boolean;
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function isunaryoverloaded(var t : tnode) : 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; how: tvarregable);
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procedure calcregisters(p : tbinarynode;r32,fpu,mmx : word);
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{ procvar handling }
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function is_procvar_load(p:tnode):boolean;
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procedure test_local_to_procvar(from_def:tprocvardef;to_def:tdef);
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{ sets varsym varstate field correctly }
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type
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tvarstateflag = (vsf_must_be_valid,vsf_use_hints);
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tvarstateflags = set of tvarstateflag;
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procedure set_varstate(p:tnode;newstate:tvarstate;varstateflags:tvarstateflags);
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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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function valid_for_formal_var(p : tnode; report_errors: boolean) : boolean;
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function valid_for_formal_const(p : tnode; report_errors: boolean) : boolean;
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function valid_for_var(p:tnode; report_errors: boolean):boolean;
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function valid_for_assignment(p:tnode; report_errors: boolean):boolean;
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function valid_for_addr(p : tnode; report_errors: boolean) : boolean;
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function allowenumop(nt:tnodetype):boolean;
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procedure check_hints(const srsym: tsym; const symoptions: tsymoptions);
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procedure check_ranges(const location: tfileposinfo; source: tnode; destdef: tdef);
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implementation
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uses
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globtype,systems,
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cutils,verbose,
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symtable,
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defutil,defcmp,
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nbas,ncnv,nld,nmem,ncal,nmat,ninl,nutils,
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cgbase,procinfo
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;
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type
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TValidAssign=(Valid_Property,Valid_Void,Valid_Const,Valid_Addr);
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TValidAssigns=set of TValidAssign;
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function node2opstr(nt:tnodetype):string;
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var
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i : integer;
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begin
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result:='<unknown>';
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for i:=1 to tok2nodes do
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if tok2node[i].nod=nt then
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begin
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result:=tokeninfo^[tok2node[i].tok].str;
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break;
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end;
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end;
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function isbinaryoperatoroverloadable(treetyp:tnodetype;ld:tdef;lt:tnodetype;rd:tdef;rt:tnodetype) : boolean;
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function internal_check(treetyp:tnodetype;ld:tdef;lt:tnodetype;rd:tdef;rt:tnodetype;var allowed:boolean):boolean;
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begin
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internal_check:=true;
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case ld.deftype of
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formaldef,
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recorddef,
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variantdef :
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begin
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allowed:=true;
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end;
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procvardef :
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begin
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if (rd.deftype in [pointerdef,procdef,procvardef]) then
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begin
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allowed:=false;
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exit;
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end;
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allowed:=true;
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end;
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pointerdef :
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begin
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if ((rd.deftype in [orddef,enumdef,pointerdef,classrefdef,procvardef]) or
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is_class_or_interface(rd)) then
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begin
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allowed:=false;
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exit;
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end;
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{ don't allow pchar+string }
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if (is_pchar(ld) or is_pwidechar(ld)) and
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((rd.deftype=stringdef) or
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is_pchar(rd) or
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is_pwidechar(rd) or
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is_chararray(rd) or
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is_widechararray(rd)) then
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begin
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allowed:=false;
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exit;
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end;
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allowed:=true;
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end;
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arraydef :
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begin
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{ not mmx }
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if (cs_mmx in aktlocalswitches) and
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is_mmx_able_array(ld) then
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begin
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allowed:=false;
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exit;
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end;
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{ not chararray+[(wide)char,(wide)string,(wide)chararray] }
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if (is_chararray(ld) or is_widechararray(ld) or
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is_open_chararray(ld) or is_open_widechararray(ld))
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and
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((rd.deftype in [stringdef,orddef,enumdef]) or
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is_pchar(rd) or
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is_pwidechar(rd) or
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is_chararray(rd) or
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is_widechararray(rd) or
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is_open_chararray(rd) or
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is_open_widechararray(rd) or
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(rt=niln)) then
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begin
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allowed:=false;
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exit;
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end;
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{ dynamic array compare with niln }
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if ((is_dynamic_array(ld) and
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(rt=niln)) or
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(is_dynamic_array(ld) and is_dynamic_array(rd)))
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and
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(treetyp in [equaln,unequaln]) then
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begin
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allowed:=false;
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exit;
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end;
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allowed:=true;
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end;
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objectdef :
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begin
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{ <> and = are defined for classes }
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if (treetyp in [equaln,unequaln]) and
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is_class_or_interface(ld) then
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begin
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allowed:=false;
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exit;
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end;
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allowed:=true;
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end;
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stringdef :
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begin
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if (rd.deftype in [orddef,enumdef,stringdef]) or
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is_pchar(rd) or
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is_pwidechar(rd) or
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is_chararray(rd) or
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is_widechararray(rd) or
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is_open_chararray(rd) or
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is_open_widechararray(rd) then
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begin
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allowed:=false;
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exit;
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end;
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allowed:=true;
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end;
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else
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internal_check:=false;
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end;
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end;
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var
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allowed : boolean;
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begin
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{ power ** is always possible }
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if (treetyp=starstarn) then
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begin
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isbinaryoperatoroverloadable:=true;
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exit;
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end;
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{ order of arguments does not matter so we have to check also
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the reversed order }
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allowed:=false;
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if not internal_check(treetyp,ld,lt,rd,rt,allowed) then
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internal_check(treetyp,rd,rt,ld,lt,allowed);
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isbinaryoperatoroverloadable:=allowed;
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end;
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function isunaryoperatoroverloadable(treetyp : tnodetype;ld : tdef) : boolean;
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begin
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result:=false;
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case treetyp of
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subn,
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unaryminusn :
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begin
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if (ld.deftype in [orddef,enumdef,floatdef]) then
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exit;
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{$ifdef SUPPORT_MMX}
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if (cs_mmx in aktlocalswitches) and
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is_mmx_able_array(ld) then
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exit;
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{$endif SUPPORT_MMX}
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result:=true;
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end;
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notn :
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begin
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if (ld.deftype in [orddef,enumdef,floatdef]) then
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exit;
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{$ifdef SUPPORT_MMX}
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if (cs_mmx in aktlocalswitches) and
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is_mmx_able_array(ld) then
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exit;
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{$endif SUPPORT_MMX}
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result:=true;
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end;
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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 : tdef;
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i : longint;
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eq : tequaltype;
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conv : tconverttype;
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pd : tprocdef;
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begin
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result:=false;
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case pf.parast.symindex.count of
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1 : begin
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ld:=tparavarsym(pf.parast.symindex.first).vartype.def;
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{ assignment is a special case }
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if optoken=_ASSIGNMENT then
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begin
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eq:=compare_defs_ext(ld,pf.rettype.def,nothingn,conv,pd,[cdo_explicit]);
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result:=(eq=te_incompatible);
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end
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else
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begin
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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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result:=
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tok2node[i].op_overloading_supported and
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isunaryoperatoroverloadable(tok2node[i].nod,ld);
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break;
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end;
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end;
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end;
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2 : begin
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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:=tparavarsym(pf.parast.symindex.first).vartype.def;
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rd:=tparavarsym(pf.parast.symindex.first.indexnext).vartype.def;
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result:=
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tok2node[i].op_overloading_supported and
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isbinaryoperatoroverloadable(tok2node[i].nod,ld,nothingn,rd,nothingn);
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break;
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end;
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end;
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end;
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end;
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function isunaryoverloaded(var t : tnode) : boolean;
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var
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ld : tdef;
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optoken : ttoken;
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operpd : tprocdef;
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ppn : tcallparanode;
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candidates : tcallcandidates;
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cand_cnt : integer;
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begin
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result:=false;
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operpd:=nil;
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{ load easier access variables }
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ld:=tunarynode(t).left.resulttype.def;
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if not isunaryoperatoroverloadable(t.nodetype,ld) then
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exit;
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{ operator overload is possible }
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result:=true;
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case t.nodetype of
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notn:
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optoken:=_OP_NOT;
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unaryminusn:
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optoken:=_MINUS;
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else
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begin
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CGMessage(parser_e_operator_not_overloaded);
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t:=cnothingnode.create;
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exit;
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end;
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end;
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{ generate parameter nodes }
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ppn:=ccallparanode.create(tunarynode(t).left.getcopy,nil);
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ppn.get_paratype;
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candidates:=tcallcandidates.create_operator(optoken,ppn);
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{ stop when there are no operators found }
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if candidates.count=0 then
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begin
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CGMessage(parser_e_operator_not_overloaded);
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candidates.free;
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ppn.free;
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t:=cnothingnode.create;
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exit;
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end;
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|
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{ Retrieve information about the candidates }
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candidates.get_information;
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{$ifdef EXTDEBUG}
|
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{ Display info when multiple candidates are found }
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candidates.dump_info(V_Debug);
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{$endif EXTDEBUG}
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cand_cnt:=candidates.choose_best(operpd);
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{ exit when no overloads are found }
|
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if cand_cnt=0 then
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begin
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CGMessage(parser_e_operator_not_overloaded);
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candidates.free;
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ppn.free;
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t:=cnothingnode.create;
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exit;
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end;
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|
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{ Multiple candidates left? }
|
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if cand_cnt>1 then
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begin
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CGMessage(type_e_cant_choose_overload_function);
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{$ifdef EXTDEBUG}
|
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candidates.dump_info(V_Hint);
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{$else EXTDEBUG}
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candidates.list(false);
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{$endif EXTDEBUG}
|
|
{ we'll just use the first candidate to make the
|
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call }
|
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end;
|
|
candidates.free;
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|
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addsymref(operpd.procsym);
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|
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{ the nil as symtable signs firstcalln that this is
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an overloaded operator }
|
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t:=ccallnode.create(ppn,Tprocsym(operpd.procsym),nil,nil,[]);
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|
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{ we already know the procdef to use, so it can
|
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skip the overload choosing in callnode.det_resulttype }
|
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tcallnode(t).procdefinition:=operpd;
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end;
|
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|
|
|
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function isbinaryoverloaded(var t : tnode) : boolean;
|
|
var
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rd,ld : tdef;
|
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optoken : ttoken;
|
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operpd : tprocdef;
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ht : tnode;
|
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ppn : tcallparanode;
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candidates : tcallcandidates;
|
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cand_cnt : integer;
|
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begin
|
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isbinaryoverloaded:=false;
|
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operpd:=nil;
|
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{ load easier access variables }
|
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ld:=tbinarynode(t).left.resulttype.def;
|
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rd:=tbinarynode(t).right.resulttype.def;
|
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if not isbinaryoperatoroverloadable(t.nodetype,ld,tbinarynode(t).left.nodetype,rd,tbinarynode(t).right.nodetype) then
|
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exit;
|
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|
|
{ operator overload is possible }
|
|
result:=true;
|
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|
|
case t.nodetype of
|
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equaln,
|
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unequaln :
|
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optoken:=_EQUAL;
|
|
addn:
|
|
optoken:=_PLUS;
|
|
subn:
|
|
optoken:=_MINUS;
|
|
muln:
|
|
optoken:=_STAR;
|
|
starstarn:
|
|
optoken:=_STARSTAR;
|
|
slashn:
|
|
optoken:=_SLASH;
|
|
ltn:
|
|
optoken:=_LT;
|
|
gtn:
|
|
optoken:=_GT;
|
|
lten:
|
|
optoken:=_LTE;
|
|
gten:
|
|
optoken:=_GTE;
|
|
symdifn :
|
|
optoken:=_SYMDIF;
|
|
modn :
|
|
optoken:=_OP_MOD;
|
|
orn :
|
|
optoken:=_OP_OR;
|
|
xorn :
|
|
optoken:=_OP_XOR;
|
|
andn :
|
|
optoken:=_OP_AND;
|
|
divn :
|
|
optoken:=_OP_DIV;
|
|
shln :
|
|
optoken:=_OP_SHL;
|
|
shrn :
|
|
optoken:=_OP_SHR;
|
|
else
|
|
begin
|
|
CGMessage(parser_e_operator_not_overloaded);
|
|
t:=cnothingnode.create;
|
|
exit;
|
|
end;
|
|
end;
|
|
|
|
{ generate parameter nodes }
|
|
ppn:=ccallparanode.create(tbinarynode(t).right.getcopy,ccallparanode.create(tbinarynode(t).left.getcopy,nil));
|
|
ppn.get_paratype;
|
|
candidates:=tcallcandidates.create_operator(optoken,ppn);
|
|
|
|
{ for commutative operators we can swap arguments and try again }
|
|
if (candidates.count=0) and
|
|
not(optoken in [_OP_SHL,_OP_SHR,_OP_DIV,_OP_MOD,_STARSTAR,_SLASH,_MINUS]) then
|
|
begin
|
|
candidates.free;
|
|
reverseparameters(ppn);
|
|
{ reverse compare operators }
|
|
case optoken of
|
|
_LT:
|
|
optoken:=_GTE;
|
|
_GT:
|
|
optoken:=_LTE;
|
|
_LTE:
|
|
optoken:=_GT;
|
|
_GTE:
|
|
optoken:=_LT;
|
|
end;
|
|
candidates:=tcallcandidates.create_operator(optoken,ppn);
|
|
end;
|
|
|
|
{ stop when there are no operators found }
|
|
if candidates.count=0 then
|
|
begin
|
|
CGMessage(parser_e_operator_not_overloaded);
|
|
candidates.free;
|
|
ppn.free;
|
|
t:=cnothingnode.create;
|
|
exit;
|
|
end;
|
|
|
|
{ Retrieve information about the candidates }
|
|
candidates.get_information;
|
|
{$ifdef EXTDEBUG}
|
|
{ Display info when multiple candidates are found }
|
|
candidates.dump_info(V_Debug);
|
|
{$endif EXTDEBUG}
|
|
cand_cnt:=candidates.choose_best(operpd);
|
|
|
|
{ exit when no overloads are found }
|
|
if cand_cnt=0 then
|
|
begin
|
|
CGMessage(parser_e_operator_not_overloaded);
|
|
candidates.free;
|
|
ppn.free;
|
|
t:=cnothingnode.create;
|
|
exit;
|
|
end;
|
|
|
|
{ Multiple candidates left? }
|
|
if cand_cnt>1 then
|
|
begin
|
|
CGMessage(type_e_cant_choose_overload_function);
|
|
{$ifdef EXTDEBUG}
|
|
candidates.dump_info(V_Hint);
|
|
{$else EXTDEBUG}
|
|
candidates.list(false);
|
|
{$endif EXTDEBUG}
|
|
{ we'll just use the first candidate to make the
|
|
call }
|
|
end;
|
|
candidates.free;
|
|
|
|
addsymref(operpd.procsym);
|
|
|
|
{ the nil as symtable signs firstcalln that this is
|
|
an overloaded operator }
|
|
ht:=ccallnode.create(ppn,Tprocsym(operpd.procsym),nil,nil,[]);
|
|
|
|
{ we already know the procdef to use, so it can
|
|
skip the overload choosing in callnode.det_resulttype }
|
|
tcallnode(ht).procdefinition:=operpd;
|
|
|
|
if t.nodetype=unequaln then
|
|
ht:=cnotnode.create(ht);
|
|
t:=ht;
|
|
end;
|
|
|
|
|
|
{****************************************************************************
|
|
Register Calculation
|
|
****************************************************************************}
|
|
|
|
{ marks an lvalue as "unregable" }
|
|
procedure make_not_regable_intern(p : tnode; how: tvarregable; records_only: boolean);
|
|
begin
|
|
case p.nodetype of
|
|
subscriptn:
|
|
make_not_regable_intern(tsubscriptnode(p).left,how,true);
|
|
typeconvn :
|
|
if (ttypeconvnode(p).resulttype.def.deftype = recorddef) then
|
|
make_not_regable_intern(ttypeconvnode(p).left,how,false)
|
|
else
|
|
make_not_regable_intern(ttypeconvnode(p).left,how,records_only);
|
|
loadn :
|
|
if (tloadnode(p).symtableentry.typ in [globalvarsym,localvarsym,paravarsym]) and
|
|
(tabstractvarsym(tloadnode(p).symtableentry).varregable <> vr_none) and
|
|
((not records_only) or
|
|
(tabstractvarsym(tloadnode(p).symtableentry).vartype.def.deftype = recorddef)) then
|
|
if (tloadnode(p).symtableentry.typ = paravarsym) then
|
|
tabstractvarsym(tloadnode(p).symtableentry).varregable:=how
|
|
else
|
|
tabstractvarsym(tloadnode(p).symtableentry).varregable:=vr_none;
|
|
end;
|
|
end;
|
|
|
|
procedure make_not_regable(p : tnode; how: tvarregable);
|
|
begin
|
|
make_not_regable_intern(p,how,false);
|
|
end;
|
|
|
|
{ calculates the needed registers for a binary operator }
|
|
procedure calcregisters(p : tbinarynode;r32,fpu,mmx : word);
|
|
|
|
begin
|
|
p.left_right_max;
|
|
|
|
{ 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
|
|
{ the location must be already filled in because we need it to }
|
|
{ calculate the necessary number of registers (JM) }
|
|
if p.expectloc = LOC_INVALID then
|
|
internalerror(200110101);
|
|
|
|
if (abs(p.left.registersint-p.right.registersint)<r32) or
|
|
((p.expectloc = LOC_FPUREGISTER) and
|
|
(p.right.registersfpu <= p.left.registersfpu) and
|
|
((p.right.registersfpu <> 0) or (p.left.registersfpu <> 0)) and
|
|
(p.left.registersint < p.right.registersint)) then
|
|
inc(p.registersint,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);
|
|
{$endif SUPPORT_MMX}
|
|
{ the following is a little bit guessing but I think }
|
|
{ it's the only way to solve same internalerrors: }
|
|
{ if the left and right node both uses registers }
|
|
{ and return a mem location, but the current node }
|
|
{ doesn't use an integer register we get probably }
|
|
{ trouble when restoring a node }
|
|
if (p.left.registersint=p.right.registersint) and
|
|
(p.registersint=p.left.registersint) and
|
|
(p.registersint>0) and
|
|
(p.left.expectloc in [LOC_REFERENCE,LOC_CREFERENCE]) and
|
|
(p.right.expectloc in [LOC_REFERENCE,LOC_CREFERENCE]) then
|
|
inc(p.registersint);
|
|
end
|
|
else
|
|
begin
|
|
if (p.left.registersint<r32) then
|
|
inc(p.registersint,r32);
|
|
if (p.left.registersfpu<fpu) then
|
|
inc(p.registersfpu,fpu);
|
|
{$ifdef SUPPORT_MMX}
|
|
if (p.left.registersmmx<mmx) then
|
|
inc(p.registersmmx,mmx);
|
|
{$endif SUPPORT_MMX}
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
{****************************************************************************
|
|
Subroutine Handling
|
|
****************************************************************************}
|
|
|
|
function is_procvar_load(p:tnode):boolean;
|
|
begin
|
|
result:=false;
|
|
{ remove voidpointer typecast for tp procvars }
|
|
if ((m_tp_procvar in aktmodeswitches) or
|
|
(m_mac_procvar in aktmodeswitches)) and
|
|
(p.nodetype=typeconvn) and
|
|
is_voidpointer(p.resulttype.def) then
|
|
p:=tunarynode(p).left;
|
|
result:=(p.nodetype=typeconvn) and
|
|
(ttypeconvnode(p).convtype=tc_proc_2_procvar);
|
|
end;
|
|
|
|
|
|
{ local routines can't be assigned to procvars }
|
|
procedure test_local_to_procvar(from_def:tprocvardef;to_def:tdef);
|
|
begin
|
|
if (from_def.parast.symtablelevel>normal_function_level) and
|
|
(to_def.deftype=procvardef) then
|
|
CGMessage(type_e_cannot_local_proc_to_procvar);
|
|
end;
|
|
|
|
|
|
procedure set_varstate(p:tnode;newstate:tvarstate;varstateflags:tvarstateflags);
|
|
const
|
|
vstrans: array[tvarstate,tvarstate] of tvarstate = (
|
|
{ vs_none -> ... }
|
|
(vs_none,vs_declared,vs_initialised,vs_read,vs_read_not_warned,vs_written,vs_readwritten),
|
|
{ vs_declared -> ... }
|
|
(vs_none,vs_declared,vs_initialised,vs_read,vs_read_not_warned,vs_written,vs_readwritten),
|
|
{ vs_initialised -> ... }
|
|
(vs_none,vs_initialised,vs_initialised,vs_read,vs_read,vs_written,vs_readwritten),
|
|
{ vs_read -> ... }
|
|
(vs_none,vs_read,vs_read,vs_read,vs_read_not_warned,vs_readwritten,vs_readwritten),
|
|
{ vs_read_not_warned -> ... }
|
|
(vs_none,vs_read_not_warned,vs_read,vs_read,vs_read_not_warned,vs_readwritten,vs_readwritten),
|
|
{ vs_written -> ... }
|
|
(vs_none,vs_written,vs_written,vs_readwritten,vs_readwritten,vs_written,vs_readwritten),
|
|
{ vs_readwritten -> ... }
|
|
(vs_none,vs_readwritten,vs_readwritten,vs_readwritten,vs_readwritten,vs_readwritten,vs_readwritten));
|
|
var
|
|
hsym : tabstractvarsym;
|
|
begin
|
|
while assigned(p) do
|
|
begin
|
|
case p.nodetype of
|
|
typeconvn :
|
|
begin
|
|
case ttypeconvnode(p).convtype of
|
|
tc_cchar_2_pchar,
|
|
tc_cstring_2_pchar,
|
|
tc_array_2_pointer :
|
|
exclude(varstateflags,vsf_must_be_valid);
|
|
tc_pchar_2_string,
|
|
tc_pointer_2_array :
|
|
include(varstateflags,vsf_must_be_valid);
|
|
end;
|
|
p:=tunarynode(p).left;
|
|
end;
|
|
subscriptn :
|
|
begin
|
|
if is_class_or_interface(tunarynode(p).left.resulttype.def) then
|
|
newstate := vs_read;
|
|
p:=tunarynode(p).left;
|
|
end;
|
|
vecn:
|
|
begin
|
|
set_varstate(tbinarynode(p).right,vs_read,[vsf_must_be_valid]);
|
|
if (newstate in [vs_read,vs_readwritten]) or
|
|
not(tunarynode(p).left.resulttype.def.deftype in [stringdef,arraydef]) then
|
|
include(varstateflags,vsf_must_be_valid)
|
|
else if (newstate = vs_written) then
|
|
exclude(varstateflags,vsf_must_be_valid);
|
|
p:=tunarynode(p).left;
|
|
end;
|
|
{ do not parse calln }
|
|
calln :
|
|
break;
|
|
loadn :
|
|
begin
|
|
if (tloadnode(p).symtableentry.typ in [localvarsym,paravarsym,globalvarsym]) then
|
|
begin
|
|
hsym:=tabstractvarsym(tloadnode(p).symtableentry);
|
|
if (vsf_must_be_valid in varstateflags) and
|
|
(hsym.varstate in [vs_declared,vs_read_not_warned]) then
|
|
begin
|
|
{ Give warning/note for uninitialized locals }
|
|
if assigned(hsym.owner) and
|
|
not(vo_is_external in hsym.varoptions) and
|
|
(hsym.owner.symtabletype in [parasymtable,localsymtable,staticsymtable]) and
|
|
((hsym.owner=current_procinfo.procdef.localst) or
|
|
(hsym.owner=current_procinfo.procdef.parast)) then
|
|
begin
|
|
if (vo_is_funcret in hsym.varoptions) then
|
|
begin
|
|
if (vsf_use_hints in varstateflags) then
|
|
CGMessage(sym_h_function_result_uninitialized)
|
|
else
|
|
CGMessage(sym_w_function_result_uninitialized)
|
|
end
|
|
else
|
|
begin
|
|
if tloadnode(p).symtable.symtabletype=localsymtable then
|
|
begin
|
|
if (vsf_use_hints in varstateflags) then
|
|
CGMessage1(sym_h_uninitialized_local_variable,hsym.realname)
|
|
else
|
|
CGMessage1(sym_w_uninitialized_local_variable,hsym.realname);
|
|
end
|
|
else
|
|
begin
|
|
if (vsf_use_hints in varstateflags) then
|
|
CGMessage1(sym_h_uninitialized_variable,hsym.realname)
|
|
else
|
|
CGMessage1(sym_w_uninitialized_variable,hsym.realname);
|
|
end;
|
|
end;
|
|
end
|
|
else if (newstate = vs_read) then
|
|
newstate := vs_read_not_warned;
|
|
end;
|
|
hsym.varstate := vstrans[hsym.varstate,newstate];
|
|
end;
|
|
break;
|
|
end;
|
|
callparan :
|
|
internalerror(200310081);
|
|
else
|
|
break;
|
|
end;{case }
|
|
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;
|
|
|
|
|
|
function valid_for_assign(p:tnode;opts:TValidAssigns; report_errors: boolean):boolean;
|
|
var
|
|
hp : tnode;
|
|
gotstring,
|
|
gotsubscript,
|
|
gotrecord,
|
|
gotpointer,
|
|
gotvec,
|
|
gotclass,
|
|
gotdynarray,
|
|
gotderef : boolean;
|
|
fromdef,
|
|
todef : tdef;
|
|
errmsg : longint;
|
|
begin
|
|
if valid_const in opts then
|
|
errmsg:=type_e_variable_id_expected
|
|
else
|
|
errmsg:=type_e_argument_cant_be_assigned;
|
|
result:=false;
|
|
gotsubscript:=false;
|
|
gotvec:=false;
|
|
gotderef:=false;
|
|
gotrecord:=false;
|
|
gotclass:=false;
|
|
gotpointer:=false;
|
|
gotdynarray:=false;
|
|
gotstring:=false;
|
|
hp:=p;
|
|
if not(valid_void in opts) and
|
|
is_void(hp.resulttype.def) then
|
|
begin
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,errmsg);
|
|
exit;
|
|
end;
|
|
while assigned(hp) do
|
|
begin
|
|
{ property allowed? calln has a property check itself }
|
|
if (nf_isproperty in hp.flags) then
|
|
begin
|
|
if (hp.nodetype=calln) then
|
|
begin
|
|
{ check return type }
|
|
case hp.resulttype.def.deftype of
|
|
pointerdef :
|
|
gotpointer:=true;
|
|
objectdef :
|
|
gotclass:=is_class_or_interface(hp.resulttype.def);
|
|
recorddef :
|
|
gotrecord:=true;
|
|
classrefdef :
|
|
gotclass:=true;
|
|
stringdef :
|
|
gotstring:=true;
|
|
end;
|
|
if (valid_property in opts) then
|
|
begin
|
|
{ don't allow writing to calls that will create
|
|
temps like calls that return a structure and we
|
|
are assigning to a member }
|
|
if (valid_const in opts) or
|
|
not(
|
|
(gotsubscript and gotrecord) or
|
|
(gotstring and gotvec)
|
|
) then
|
|
result:=true
|
|
else
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,errmsg);
|
|
end
|
|
else
|
|
begin
|
|
{ 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
|
|
3. if the address is needed of a field (subscriptn) }
|
|
if (gotpointer and gotderef) or
|
|
(gotstring and gotvec) or
|
|
(
|
|
(gotclass or gotrecord) and
|
|
(gotsubscript)
|
|
) or
|
|
(
|
|
(gotvec and gotdynarray)
|
|
) or
|
|
(
|
|
(Valid_Addr in opts) and
|
|
(hp.nodetype=subscriptn)
|
|
) then
|
|
result:=true
|
|
else
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,errmsg);
|
|
end;
|
|
end
|
|
else
|
|
result:=true;
|
|
exit;
|
|
end;
|
|
if (Valid_Const in opts) and is_constnode(hp) then
|
|
begin
|
|
result:=true;
|
|
exit;
|
|
end;
|
|
case hp.nodetype of
|
|
temprefn :
|
|
begin
|
|
valid_for_assign := true;
|
|
exit;
|
|
end;
|
|
derefn :
|
|
begin
|
|
gotderef:=true;
|
|
hp:=tderefnode(hp).left;
|
|
end;
|
|
typeconvn :
|
|
begin
|
|
{ typecast sizes must match, exceptions:
|
|
- implicit typecast made by absolute
|
|
- from formaldef
|
|
- from void
|
|
- from/to open array
|
|
- typecast from pointer to array }
|
|
fromdef:=ttypeconvnode(hp).left.resulttype.def;
|
|
todef:=hp.resulttype.def;
|
|
if not((nf_absolute in ttypeconvnode(hp).flags) or
|
|
(fromdef.deftype=formaldef) or
|
|
is_void(fromdef) or
|
|
is_open_array(fromdef) or
|
|
is_open_array(todef) or
|
|
((fromdef.deftype=pointerdef) and (todef.deftype=arraydef)) or
|
|
((fromdef.deftype = objectdef) and (todef.deftype = objectdef) and
|
|
(tobjectdef(fromdef).is_related(tobjectdef(todef))))) and
|
|
(fromdef.size<>todef.size) then
|
|
begin
|
|
{ in TP it is allowed to typecast to smaller types. But the variable can't
|
|
be in a register }
|
|
if (m_tp7 in aktmodeswitches) or
|
|
(todef.size<fromdef.size) then
|
|
make_not_regable(hp,vr_addr)
|
|
else
|
|
if report_errors then
|
|
CGMessagePos2(hp.fileinfo,type_e_typecast_wrong_size_for_assignment,tostr(fromdef.size),tostr(todef.size));
|
|
end;
|
|
{ don't allow assignments to typeconvs that need special code }
|
|
if not(gotsubscript or gotvec or gotderef) and
|
|
not(ttypeconvnode(hp).assign_allowed) then
|
|
begin
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,errmsg);
|
|
exit;
|
|
end;
|
|
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 :
|
|
begin
|
|
gotvec:=true;
|
|
{ accesses to dyn. arrays override read only access in delphi }
|
|
if (m_delphi in aktmodeswitches) and is_dynamic_array(tunarynode(hp).left.resulttype.def) then
|
|
gotdynarray:=true;
|
|
hp:=tunarynode(hp).left;
|
|
end;
|
|
asn :
|
|
begin
|
|
{ asn can't be assigned directly, it returns the value in a register instead
|
|
of reference. }
|
|
if not(gotsubscript or gotderef or gotvec) then
|
|
begin
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,errmsg);
|
|
exit;
|
|
end;
|
|
hp:=tunarynode(hp).left;
|
|
end;
|
|
subscriptn :
|
|
begin
|
|
gotsubscript:=true;
|
|
{ loop counter? }
|
|
if not(Valid_Const in opts) and
|
|
(vo_is_loop_counter in tsubscriptnode(hp).vs.varoptions) then
|
|
begin
|
|
if report_errors then
|
|
CGMessage1(parser_e_illegal_assignment_to_count_var,tsubscriptnode(hp).vs.realname)
|
|
else
|
|
exit;
|
|
end;
|
|
{ a class/interface access is an implicit }
|
|
{ dereferencing }
|
|
hp:=tsubscriptnode(hp).left;
|
|
if is_class_or_interface(hp.resulttype.def) then
|
|
gotderef:=true;
|
|
end;
|
|
muln,
|
|
divn,
|
|
andn,
|
|
xorn,
|
|
orn,
|
|
notn,
|
|
subn,
|
|
addn :
|
|
begin
|
|
{ Allow 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
|
|
result:=true
|
|
else
|
|
{ Temp strings are stored in memory, for compatibility with
|
|
delphi only }
|
|
if (m_delphi in aktmodeswitches) and
|
|
((valid_addr in opts) or
|
|
(valid_const in opts)) and
|
|
(hp.resulttype.def.deftype=stringdef) then
|
|
result:=true
|
|
else
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,type_e_variable_id_expected);
|
|
exit;
|
|
end;
|
|
niln,
|
|
pointerconstn :
|
|
begin
|
|
{ to support e.g. @tmypointer(0)^.data; see tests/tbs/tb0481 }
|
|
if gotderef then
|
|
result:=true
|
|
else
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,type_e_no_assign_to_addr);
|
|
exit;
|
|
end;
|
|
addrn :
|
|
begin
|
|
if gotderef then
|
|
result:=true
|
|
else
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,type_e_no_assign_to_addr);
|
|
exit;
|
|
end;
|
|
calln :
|
|
begin
|
|
{ check return type }
|
|
case hp.resulttype.def.deftype of
|
|
arraydef :
|
|
begin
|
|
{ dynamic arrays are allowed when there is also a
|
|
vec node }
|
|
if is_dynamic_array(hp.resulttype.def) and
|
|
gotvec then
|
|
begin
|
|
gotderef:=true;
|
|
gotpointer:=true;
|
|
end;
|
|
end;
|
|
pointerdef :
|
|
gotpointer:=true;
|
|
objectdef :
|
|
gotclass:=is_class_or_interface(hp.resulttype.def);
|
|
recorddef, { handle record like class it needs a subscription }
|
|
classrefdef :
|
|
gotclass:=true;
|
|
stringdef :
|
|
gotstring:=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
|
|
3. string is returned }
|
|
if (gotstring and gotvec) or
|
|
(gotpointer and gotderef) or
|
|
(gotclass and gotsubscript) then
|
|
result:=true
|
|
else
|
|
{ Temp strings are stored in memory, for compatibility with
|
|
delphi only }
|
|
if (m_delphi in aktmodeswitches) and
|
|
(valid_addr in opts) and
|
|
(hp.resulttype.def.deftype=stringdef) then
|
|
result:=true
|
|
else
|
|
if ([valid_const,valid_addr] * opts = [valid_const]) then
|
|
result:=true
|
|
else
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,errmsg);
|
|
exit;
|
|
end;
|
|
inlinen :
|
|
begin
|
|
if ((valid_const in opts) and
|
|
(tinlinenode(hp).inlinenumber in [in_typeof_x]))
|
|
{$ifdef SUPPORT_UNALIGNED}
|
|
or (tinlinenode(hp).inlinenumber in [in_unaligned_x])
|
|
{$endif SUPPORT_UNALIGNED}
|
|
then
|
|
result:=true
|
|
else
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,type_e_variable_id_expected);
|
|
exit;
|
|
end;
|
|
loadn :
|
|
begin
|
|
case tloadnode(hp).symtableentry.typ of
|
|
absolutevarsym,
|
|
globalvarsym,
|
|
localvarsym,
|
|
paravarsym :
|
|
begin
|
|
{ loop counter? }
|
|
if not(Valid_Const in opts) and
|
|
not gotderef and
|
|
(vo_is_loop_counter in tabstractvarsym(tloadnode(hp).symtableentry).varoptions) then
|
|
if report_errors then
|
|
CGMessage1(parser_e_illegal_assignment_to_count_var,tloadnode(hp).symtableentry.realname)
|
|
else
|
|
exit;
|
|
{ derefed pointer }
|
|
if (tabstractvarsym(tloadnode(hp).symtableentry).varspez=vs_const) then
|
|
begin
|
|
{ allow p^:= constructions with p is const parameter }
|
|
if gotderef or gotdynarray or (Valid_Const in opts) then
|
|
result:=true
|
|
else
|
|
if report_errors then
|
|
CGMessagePos(tloadnode(hp).fileinfo,type_e_no_assign_to_const);
|
|
exit;
|
|
end;
|
|
result:=true;
|
|
exit;
|
|
end;
|
|
typedconstsym :
|
|
begin
|
|
if ttypedconstsym(tloadnode(hp).symtableentry).is_writable or
|
|
(valid_addr in opts) or
|
|
(valid_const in opts) then
|
|
result:=true
|
|
else
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,type_e_no_assign_to_const);
|
|
exit;
|
|
end;
|
|
procsym :
|
|
begin
|
|
if (Valid_Const in opts) then
|
|
result:=true
|
|
else
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,type_e_variable_id_expected);
|
|
exit;
|
|
end;
|
|
labelsym :
|
|
begin
|
|
if (Valid_Addr in opts) then
|
|
result:=true
|
|
else
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,type_e_variable_id_expected);
|
|
exit;
|
|
end;
|
|
constsym:
|
|
begin
|
|
if (tconstsym(tloadnode(hp).symtableentry).consttyp=constresourcestring) and
|
|
(valid_addr in opts) then
|
|
result:=true
|
|
else
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,type_e_variable_id_expected);
|
|
exit;
|
|
end;
|
|
else
|
|
begin
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,type_e_variable_id_expected);
|
|
exit;
|
|
end;
|
|
end;
|
|
end;
|
|
else
|
|
begin
|
|
if report_errors then
|
|
CGMessagePos(hp.fileinfo,type_e_variable_id_expected);
|
|
exit;
|
|
end;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
function valid_for_var(p:tnode; report_errors: boolean):boolean;
|
|
begin
|
|
valid_for_var:=valid_for_assign(p,[],report_errors);
|
|
end;
|
|
|
|
|
|
function valid_for_formal_var(p : tnode; report_errors: boolean) : boolean;
|
|
begin
|
|
valid_for_formal_var:=valid_for_assign(p,[valid_void],report_errors);
|
|
end;
|
|
|
|
|
|
function valid_for_formal_const(p : tnode; report_errors: boolean) : boolean;
|
|
begin
|
|
valid_for_formal_const:=(p.resulttype.def.deftype=formaldef) or
|
|
valid_for_assign(p,[valid_void,valid_const],report_errors);
|
|
end;
|
|
|
|
|
|
function valid_for_assignment(p:tnode; report_errors: boolean):boolean;
|
|
begin
|
|
valid_for_assignment:=valid_for_assign(p,[valid_property],report_errors);
|
|
end;
|
|
|
|
|
|
function valid_for_addr(p : tnode; report_errors: boolean) : boolean;
|
|
begin
|
|
result:=valid_for_assign(p,[valid_const,valid_addr,valid_void],report_errors);
|
|
end;
|
|
|
|
|
|
procedure var_para_allowed(var eq:tequaltype;def_from,def_to:Tdef);
|
|
begin
|
|
{ Note: eq must be already valid, it will only be updated! }
|
|
case def_to.deftype of
|
|
formaldef :
|
|
begin
|
|
{ all types can be passed to a formaldef }
|
|
eq:=te_equal;
|
|
end;
|
|
orddef :
|
|
begin
|
|
{ allows conversion from word to integer and
|
|
byte to shortint, but only for TP7 compatibility }
|
|
if (m_tp7 in aktmodeswitches) and
|
|
(def_from.deftype=orddef) and
|
|
(def_from.size=def_to.size) then
|
|
eq:=te_convert_l1;
|
|
end;
|
|
arraydef :
|
|
begin
|
|
if is_open_array(def_to) then
|
|
begin
|
|
if is_dynamic_array(def_from) and
|
|
equal_defs(tarraydef(def_from).elementtype.def,tarraydef(def_to).elementtype.def) then
|
|
eq:=te_convert_l2
|
|
else
|
|
if equal_defs(def_from,tarraydef(def_to).elementtype.def) then
|
|
eq:=te_convert_l2;
|
|
end;
|
|
end;
|
|
pointerdef :
|
|
begin
|
|
{ an implicit pointer conversion is allowed }
|
|
if (def_from.deftype=pointerdef) then
|
|
eq:=te_convert_l1;
|
|
end;
|
|
stringdef :
|
|
begin
|
|
{ all shortstrings are allowed, size is not important }
|
|
if is_shortstring(def_from) and
|
|
is_shortstring(def_to) then
|
|
eq:=te_equal;
|
|
end;
|
|
objectdef :
|
|
begin
|
|
{ child objects can be also passed }
|
|
{ in non-delphi mode, otherwise }
|
|
{ they must match exactly, except }
|
|
{ if they are objects }
|
|
if (def_from.deftype=objectdef) and
|
|
(
|
|
not(m_delphi in aktmodeswitches) or
|
|
(
|
|
(tobjectdef(def_from).objecttype=odt_object) and
|
|
(tobjectdef(def_to).objecttype=odt_object)
|
|
)
|
|
) and
|
|
(tobjectdef(def_from).is_related(tobjectdef(def_to))) then
|
|
eq:=te_convert_l1;
|
|
end;
|
|
filedef :
|
|
begin
|
|
{ an implicit file conversion is also allowed }
|
|
{ from a typed file to an untyped one }
|
|
if (def_from.deftype=filedef) and
|
|
(tfiledef(def_from).filetyp = ft_typed) and
|
|
(tfiledef(def_to).filetyp = ft_untyped) then
|
|
eq:=te_convert_l1;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure para_allowed(var eq:tequaltype;p:tcallparanode;def_to:tdef);
|
|
begin
|
|
{ Note: eq must be already valid, it will only be updated! }
|
|
case def_to.deftype of
|
|
formaldef :
|
|
begin
|
|
{ all types can be passed to a formaldef }
|
|
eq:=te_equal;
|
|
end;
|
|
stringdef :
|
|
begin
|
|
{ to support ansi/long/wide strings in a proper way }
|
|
{ string and string[10] are assumed as equal }
|
|
{ when searching the correct overloaded procedure }
|
|
if (p.resulttype.def.deftype=stringdef) and
|
|
(tstringdef(def_to).string_typ=tstringdef(p.resulttype.def).string_typ) then
|
|
eq:=te_equal
|
|
else
|
|
{ Passing a constant char to ansistring or shortstring or
|
|
a widechar to widestring then handle it as equal. }
|
|
if (p.left.nodetype=ordconstn) and
|
|
(
|
|
is_char(p.resulttype.def) and
|
|
(is_shortstring(def_to) or is_ansistring(def_to))
|
|
) or
|
|
(
|
|
is_widechar(p.resulttype.def) and
|
|
is_widestring(def_to)
|
|
) then
|
|
eq:=te_equal
|
|
end;
|
|
setdef :
|
|
begin
|
|
{ set can also be a not yet converted array constructor }
|
|
if (p.resulttype.def.deftype=arraydef) and
|
|
is_array_constructor(p.resulttype.def) and
|
|
not is_variant_array(p.resulttype.def) then
|
|
eq:=te_equal;
|
|
end;
|
|
procvardef :
|
|
begin
|
|
{ in tp7 mode proc -> procvar is allowed }
|
|
if ((m_tp_procvar in aktmodeswitches) or
|
|
(m_mac_procvar in aktmodeswitches)) and
|
|
(p.left.nodetype=calln) and
|
|
(proc_to_procvar_equal(tprocdef(tcallnode(p.left).procdefinition),tprocvardef(def_to))>=te_equal) then
|
|
eq:=te_equal
|
|
else
|
|
if (m_mac_procvar in aktmodeswitches) and
|
|
is_procvar_load(p.left) then
|
|
eq:=te_convert_l2;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
function allowenumop(nt:tnodetype):boolean;
|
|
begin
|
|
result:=(nt in [equaln,unequaln,ltn,lten,gtn,gten]) or
|
|
((cs_allow_enum_calc in aktlocalswitches) and
|
|
(nt in [addn,subn]));
|
|
end;
|
|
|
|
|
|
{****************************************************************************
|
|
TCallCandidates
|
|
****************************************************************************}
|
|
|
|
constructor tcallcandidates.create(sym:tprocsym;st:tsymtable;ppn:tnode;isprop,ignorevis : boolean);
|
|
var
|
|
j : integer;
|
|
pd : tprocdef;
|
|
hp : pcandidate;
|
|
found,
|
|
has_overload_directive : boolean;
|
|
topclassh : tobjectdef;
|
|
srsymtable : tsymtable;
|
|
srprocsym : tprocsym;
|
|
pt : tcallparanode;
|
|
checkstack : psymtablestackitem;
|
|
begin
|
|
if not assigned(sym) then
|
|
internalerror(200411015);
|
|
|
|
FProcSym:=sym;
|
|
FProcs:=nil;
|
|
FProccnt:=0;
|
|
FProcvisiblecnt:=0;
|
|
FParanode:=ppn;
|
|
FAllowVariant:=true;
|
|
|
|
{ determine length of parameter list }
|
|
pt:=tcallparanode(ppn);
|
|
FParalength:=0;
|
|
while assigned(pt) do
|
|
begin
|
|
inc(FParalength);
|
|
pt:=tcallparanode(pt.right);
|
|
end;
|
|
|
|
{ when the definition has overload directive set, we search for
|
|
overloaded definitions in the class, this only needs to be done once
|
|
for class entries as the tree keeps always the same }
|
|
if (not sym.overloadchecked) and
|
|
(sym.owner.symtabletype=objectsymtable) and
|
|
(po_overload in sym.first_procdef.procoptions) then
|
|
search_class_overloads(sym);
|
|
|
|
{ when the class passed is defined in this unit we
|
|
need to use the scope of that class. This is a trick
|
|
that can be used to access protected members in other
|
|
units. At least kylix supports it this way (PFV) }
|
|
if assigned(st) and
|
|
(
|
|
(st.symtabletype=objectsymtable) or
|
|
((st.symtabletype=withsymtable) and
|
|
(st.defowner.deftype=objectdef))
|
|
) and
|
|
(st.defowner.owner.symtabletype in [globalsymtable,staticsymtable]) and
|
|
st.defowner.owner.iscurrentunit then
|
|
topclassh:=tobjectdef(st.defowner)
|
|
else
|
|
begin
|
|
if assigned(current_procinfo) then
|
|
topclassh:=current_procinfo.procdef._class
|
|
else
|
|
topclassh:=nil;
|
|
end;
|
|
|
|
{ link all procedures which have the same # of parameters }
|
|
for j:=1 to sym.procdef_count do
|
|
begin
|
|
pd:=sym.procdef[j];
|
|
{ Is the procdef visible? This needs to be checked on
|
|
procdef level since a symbol can contain both private and
|
|
public declarations. But the check should not be done
|
|
when the callnode is generated by a property
|
|
|
|
inherited overrides invisible anonymous inherited (FK) }
|
|
|
|
if isprop or ignorevis or
|
|
(pd.owner.symtabletype<>objectsymtable) or
|
|
pd.is_visible_for_object(topclassh) then
|
|
begin
|
|
{ we have at least one procedure that is visible }
|
|
inc(FProcvisiblecnt);
|
|
{ only when the # of parameter are supported by the
|
|
procedure }
|
|
if (FParalength>=pd.minparacount) and
|
|
((po_varargs in pd.procoptions) or { varargs }
|
|
(FParalength<=pd.maxparacount)) then
|
|
proc_add(pd);
|
|
end;
|
|
end;
|
|
|
|
{ remember if the procedure is declared with the overload directive,
|
|
it's information is still needed also after all procs are removed }
|
|
has_overload_directive:=(po_overload in sym.first_procdef.procoptions);
|
|
|
|
{ when the definition has overload directive set, we search for
|
|
overloaded definitions in the symtablestack. The found
|
|
entries are only added to the procs list and not the procsym, because
|
|
the list can change in every situation }
|
|
if has_overload_directive and
|
|
(sym.owner.symtabletype<>objectsymtable) then
|
|
begin
|
|
srsymtable:=sym.owner;
|
|
checkstack:=symtablestack.stack;
|
|
while assigned(checkstack) and
|
|
(checkstack^.symtable<>srsymtable) do
|
|
checkstack:=checkstack^.next;
|
|
{ we've already processed the current symtable, start with
|
|
the next symtable in the stack }
|
|
if assigned(checkstack) then
|
|
checkstack:=checkstack^.next;
|
|
while assigned(checkstack) do
|
|
begin
|
|
srsymtable:=checkstack^.symtable;
|
|
if srsymtable.symtabletype in [localsymtable,staticsymtable,globalsymtable] then
|
|
begin
|
|
srprocsym:=tprocsym(srsymtable.speedsearch(sym.name,sym.speedvalue));
|
|
if assigned(srprocsym) and
|
|
(srprocsym.typ=procsym) then
|
|
begin
|
|
{ if this visible procedure doesn't have overload we can stop
|
|
searching }
|
|
if not(po_overload in srprocsym.first_procdef.procoptions) and
|
|
srprocsym.first_procdef.is_visible_for_object(topclassh) then
|
|
break;
|
|
{ process all overloaded definitions }
|
|
for j:=1 to srprocsym.procdef_count do
|
|
begin
|
|
pd:=srprocsym.procdef[j];
|
|
{ only visible procedures need to be added }
|
|
if pd.is_visible_for_object(topclassh) then
|
|
begin
|
|
{ only when the # of parameter are supported by the
|
|
procedure }
|
|
if (FParalength>=pd.minparacount) and
|
|
((po_varargs in pd.procoptions) or { varargs }
|
|
(FParalength<=pd.maxparacount)) then
|
|
begin
|
|
found:=false;
|
|
hp:=FProcs;
|
|
while assigned(hp) do
|
|
begin
|
|
{ Only compare visible parameters for the user }
|
|
if compare_paras(hp^.data.paras,pd.paras,cp_value_equal_const,[cpo_ignorehidden])>=te_equal then
|
|
begin
|
|
found:=true;
|
|
break;
|
|
end;
|
|
hp:=hp^.next;
|
|
end;
|
|
if not found then
|
|
proc_add(pd);
|
|
end;
|
|
end;
|
|
end;
|
|
end;
|
|
end;
|
|
checkstack:=checkstack^.next;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
constructor tcallcandidates.create_operator(op:ttoken;ppn:tnode);
|
|
var
|
|
j : integer;
|
|
pd : tprocdef;
|
|
hp : pcandidate;
|
|
found : boolean;
|
|
srsymtable : tsymtable;
|
|
srprocsym : tprocsym;
|
|
pt : tcallparanode;
|
|
sv : cardinal;
|
|
checkstack : psymtablestackitem;
|
|
begin
|
|
FProcSym:=nil;
|
|
FProcs:=nil;
|
|
FProccnt:=0;
|
|
FProcvisiblecnt:=0;
|
|
FParanode:=ppn;
|
|
FAllowVariant:=false;
|
|
|
|
{ determine length of parameter list }
|
|
pt:=tcallparanode(ppn);
|
|
FParalength:=0;
|
|
while assigned(pt) do
|
|
begin
|
|
if pt.resulttype.def.deftype=variantdef then
|
|
FAllowVariant:=true;
|
|
inc(FParalength);
|
|
pt:=tcallparanode(pt.right);
|
|
end;
|
|
|
|
{ we search all overloaded operator definitions in the symtablestack. The found
|
|
entries are only added to the procs list and not the procsym, because
|
|
the list can change in every situation }
|
|
sv:=getspeedvalue(overloaded_names[op]);
|
|
checkstack:=symtablestack.stack;
|
|
while assigned(checkstack) do
|
|
begin
|
|
srsymtable:=checkstack^.symtable;
|
|
if srsymtable.symtabletype in [localsymtable,staticsymtable,globalsymtable] then
|
|
begin
|
|
srprocsym:=tprocsym(srsymtable.speedsearch(overloaded_names[op],sv));
|
|
if assigned(srprocsym) and
|
|
(srprocsym.typ=procsym) then
|
|
begin
|
|
{ Store first procsym found }
|
|
if not assigned(FProcsym) then
|
|
FProcsym:=srprocsym;
|
|
|
|
{ process all overloaded definitions }
|
|
for j:=1 to srprocsym.procdef_count do
|
|
begin
|
|
pd:=srprocsym.procdef[j];
|
|
{ only when the # of parameter are supported by the
|
|
procedure }
|
|
if (FParalength>=pd.minparacount) and
|
|
(FParalength<=pd.maxparacount) then
|
|
begin
|
|
found:=false;
|
|
hp:=FProcs;
|
|
while assigned(hp) do
|
|
begin
|
|
{ Only compare visible parameters for the user }
|
|
if compare_paras(hp^.data.paras,pd.paras,cp_value_equal_const,[cpo_ignorehidden])>=te_equal then
|
|
begin
|
|
found:=true;
|
|
break;
|
|
end;
|
|
hp:=hp^.next;
|
|
end;
|
|
if not found then
|
|
proc_add(pd);
|
|
end;
|
|
end;
|
|
end;
|
|
end;
|
|
checkstack:=checkstack^.next;
|
|
end;
|
|
end;
|
|
|
|
|
|
destructor tcallcandidates.destroy;
|
|
var
|
|
hpnext,
|
|
hp : pcandidate;
|
|
begin
|
|
hp:=FProcs;
|
|
while assigned(hp) do
|
|
begin
|
|
hpnext:=hp^.next;
|
|
dispose(hp);
|
|
hp:=hpnext;
|
|
end;
|
|
end;
|
|
|
|
|
|
function tcallcandidates.proc_add(pd:tprocdef):pcandidate;
|
|
var
|
|
defaultparacnt : integer;
|
|
begin
|
|
{ generate new candidate entry }
|
|
new(result);
|
|
fillchar(result^,sizeof(tcandidate),0);
|
|
result^.data:=pd;
|
|
result^.next:=FProcs;
|
|
FProcs:=result;
|
|
inc(FProccnt);
|
|
{ Find last parameter, skip all default parameters
|
|
that are not passed. Ignore this skipping for varargs }
|
|
result^.firstparaidx:=pd.paras.count-1;
|
|
if not(po_varargs in pd.procoptions) then
|
|
begin
|
|
{ ignore hidden parameters }
|
|
while (result^.firstparaidx>=0) and (vo_is_hidden_para in tparavarsym(pd.paras[result^.firstparaidx]).varoptions) do
|
|
dec(result^.firstparaidx);
|
|
defaultparacnt:=pd.maxparacount-FParalength;
|
|
if defaultparacnt>0 then
|
|
begin
|
|
if defaultparacnt>result^.firstparaidx+1 then
|
|
internalerror(200401141);
|
|
dec(result^.firstparaidx,defaultparacnt);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure tcallcandidates.list(all:boolean);
|
|
var
|
|
hp : pcandidate;
|
|
begin
|
|
hp:=FProcs;
|
|
while assigned(hp) do
|
|
begin
|
|
if all or
|
|
(not hp^.invalid) then
|
|
MessagePos1(hp^.data.fileinfo,sym_h_param_list,hp^.data.fullprocname(false));
|
|
hp:=hp^.next;
|
|
end;
|
|
end;
|
|
|
|
|
|
{$ifdef EXTDEBUG}
|
|
procedure tcallcandidates.dump_info(lvl:longint);
|
|
|
|
function ParaTreeStr(p:tcallparanode):string;
|
|
begin
|
|
result:='';
|
|
while assigned(p) do
|
|
begin
|
|
if result<>'' then
|
|
result:=','+result;
|
|
result:=p.resulttype.def.typename+result;
|
|
p:=tcallparanode(p.right);
|
|
end;
|
|
end;
|
|
|
|
var
|
|
hp : pcandidate;
|
|
i : integer;
|
|
currpara : tparavarsym;
|
|
begin
|
|
if not CheckVerbosity(lvl) then
|
|
exit;
|
|
Comment(lvl+V_LineInfo,'Overloaded callnode: '+FProcSym.name+'('+ParaTreeStr(tcallparanode(FParaNode))+')');
|
|
hp:=FProcs;
|
|
while assigned(hp) do
|
|
begin
|
|
Comment(lvl,' '+hp^.data.fullprocname(false));
|
|
if (hp^.invalid) then
|
|
Comment(lvl,' invalid')
|
|
else
|
|
begin
|
|
Comment(lvl,' ex: '+tostr(hp^.exact_count)+
|
|
' eq: '+tostr(hp^.equal_count)+
|
|
' l1: '+tostr(hp^.cl1_count)+
|
|
' l2: '+tostr(hp^.cl2_count)+
|
|
' l3: '+tostr(hp^.cl3_count)+
|
|
' oper: '+tostr(hp^.coper_count)+
|
|
' ord: '+realtostr(hp^.ordinal_distance));
|
|
{ Print parameters in left-right order }
|
|
for i:=0 to hp^.data.paras.count-1 do
|
|
begin
|
|
currpara:=tparavarsym(hp^.data.paras[i]);
|
|
if (vo_is_hidden_para in currpara.varoptions) then
|
|
Comment(lvl,' - '+currpara.vartype.def.typename+' : '+EqualTypeName[currpara.eqval]);
|
|
end;
|
|
end;
|
|
hp:=hp^.next;
|
|
end;
|
|
end;
|
|
{$endif EXTDEBUG}
|
|
|
|
|
|
procedure tcallcandidates.get_information;
|
|
var
|
|
hp : pcandidate;
|
|
currpara : tparavarsym;
|
|
paraidx : integer;
|
|
currparanr : byte;
|
|
rfh,rth : bestreal;
|
|
objdef : tobjectdef;
|
|
def_from,
|
|
def_to : tdef;
|
|
currpt,
|
|
pt : tcallparanode;
|
|
eq : tequaltype;
|
|
convtype : tconverttype;
|
|
pdtemp,
|
|
pdoper : tprocdef;
|
|
releasecurrpt : boolean;
|
|
cdoptions : tcompare_defs_options;
|
|
begin
|
|
cdoptions:=[cdo_check_operator];
|
|
if FAllowVariant then
|
|
include(cdoptions,cdo_allow_variant);
|
|
{ process all procs }
|
|
hp:=FProcs;
|
|
while assigned(hp) do
|
|
begin
|
|
{ We compare parameters in reverse order (right to left),
|
|
the firstpara is already pointing to the last parameter
|
|
were we need to start comparing }
|
|
currparanr:=FParalength;
|
|
paraidx:=hp^.firstparaidx;
|
|
while (paraidx>=0) and (vo_is_hidden_para in tparavarsym(hp^.data.paras[paraidx]).varoptions) do
|
|
dec(paraidx);
|
|
pt:=tcallparanode(FParaNode);
|
|
while assigned(pt) and (paraidx>=0) do
|
|
begin
|
|
currpara:=tparavarsym(hp^.data.paras[paraidx]);
|
|
{ currpt can be changed from loadn to calln when a procvar
|
|
is passed. This is to prevent that the change is permanent }
|
|
currpt:=pt;
|
|
releasecurrpt:=false;
|
|
{ retrieve current parameter definitions to compares }
|
|
eq:=te_incompatible;
|
|
def_from:=currpt.resulttype.def;
|
|
def_to:=currpara.vartype.def;
|
|
if not(assigned(def_from)) then
|
|
internalerror(200212091);
|
|
if not(
|
|
assigned(def_to) or
|
|
((po_varargs in hp^.data.procoptions) and
|
|
(currparanr>hp^.data.minparacount))
|
|
) then
|
|
internalerror(200212092);
|
|
|
|
{ Convert tp procvars when not expecting a procvar }
|
|
if (def_to.deftype<>procvardef) and
|
|
(currpt.left.resulttype.def.deftype=procvardef) then
|
|
begin
|
|
releasecurrpt:=true;
|
|
currpt:=tcallparanode(pt.getcopy);
|
|
if maybe_call_procvar(currpt.left,true) then
|
|
begin
|
|
currpt.resulttype:=currpt.left.resulttype;
|
|
def_from:=currpt.left.resulttype.def;
|
|
end;
|
|
end;
|
|
|
|
{ If we expect a procvar and the left is loadnode that
|
|
returns a procdef we need to find the correct overloaded
|
|
procdef that matches the expected procvar. The loadnode
|
|
temporary returned the first procdef (PFV) }
|
|
if (def_to.deftype=procvardef) and
|
|
(currpt.left.nodetype=loadn) and
|
|
(currpt.left.resulttype.def.deftype=procdef) then
|
|
begin
|
|
pdtemp:=tprocsym(Tloadnode(currpt.left).symtableentry).search_procdef_byprocvardef(Tprocvardef(def_to));
|
|
if assigned(pdtemp) then
|
|
begin
|
|
tloadnode(currpt.left).procdef:=pdtemp;
|
|
currpt.left.resulttype.setdef(tloadnode(currpt.left).procdef);
|
|
currpt.resulttype:=currpt.left.resulttype;
|
|
def_from:=currpt.left.resulttype.def;
|
|
end;
|
|
end;
|
|
|
|
{ varargs are always equal, but not exact }
|
|
if (po_varargs in hp^.data.procoptions) and
|
|
(currparanr>hp^.data.minparacount) then
|
|
begin
|
|
eq:=te_equal;
|
|
end
|
|
else
|
|
{ same definition -> exact }
|
|
if (def_from=def_to) then
|
|
begin
|
|
eq:=te_exact;
|
|
end
|
|
else
|
|
{ for value and const parameters check if a integer is constant or
|
|
included in other integer -> equal and calc ordinal_distance }
|
|
if not(currpara.varspez in [vs_var,vs_out]) and
|
|
is_integer(def_from) and
|
|
is_integer(def_to) and
|
|
is_in_limit(def_from,def_to) then
|
|
begin
|
|
eq:=te_equal;
|
|
hp^.ordinal_distance:=hp^.ordinal_distance+
|
|
abs(bestreal(torddef(def_from).low)-bestreal(torddef(def_to).low));
|
|
if (torddef(def_to).typ=u64bit) then
|
|
rth:=bestreal(qword(torddef(def_to).high))
|
|
else
|
|
rth:=bestreal(torddef(def_to).high);
|
|
if (torddef(def_from).typ=u64bit) then
|
|
rfh:=bestreal(qword(torddef(def_from).high))
|
|
else
|
|
rfh:=bestreal(torddef(def_from).high);
|
|
hp^.ordinal_distance:=hp^.ordinal_distance+abs(rth-rfh);
|
|
{ Give wrong sign a small penalty, this is need to get a diffrence
|
|
from word->[longword,longint] }
|
|
if is_signed(def_from)<>is_signed(def_to) then
|
|
hp^.ordinal_distance:=hp^.ordinal_distance+1.0;
|
|
end
|
|
else
|
|
{ for value and const parameters check precision of real, give
|
|
penalty for loosing of precision. var and out parameters must match exactly }
|
|
if not(currpara.varspez in [vs_var,vs_out]) and
|
|
is_real(def_from) and
|
|
is_real(def_to) then
|
|
begin
|
|
eq:=te_equal;
|
|
if is_extended(def_to) then
|
|
rth:=bestreal(4)
|
|
else
|
|
if is_double (def_to) then
|
|
rth:=bestreal(2)
|
|
else
|
|
rth:=bestreal(1);
|
|
if is_extended(def_from) then
|
|
rfh:=bestreal(4)
|
|
else
|
|
if is_double (def_from) then
|
|
rfh:=bestreal(2)
|
|
else
|
|
rfh:=bestreal(1);
|
|
{ penalty for shrinking of precision }
|
|
if rth<rfh then
|
|
rfh:=(rfh-rth)*16
|
|
else
|
|
rfh:=rth-rfh;
|
|
hp^.ordinal_distance:=hp^.ordinal_distance+rfh;
|
|
end
|
|
else
|
|
{ related object parameters also need to determine the distance between the current
|
|
object and the object we are comparing with. var and out parameters must match exactly }
|
|
if not(currpara.varspez in [vs_var,vs_out]) and
|
|
(def_from.deftype=objectdef) and
|
|
(def_to.deftype=objectdef) and
|
|
(tobjectdef(def_from).objecttype=tobjectdef(def_to).objecttype) and
|
|
tobjectdef(def_from).is_related(tobjectdef(def_to)) then
|
|
begin
|
|
eq:=te_convert_l1;
|
|
objdef:=tobjectdef(def_from);
|
|
while assigned(objdef) do
|
|
begin
|
|
if objdef=def_to then
|
|
break;
|
|
hp^.ordinal_distance:=hp^.ordinal_distance+1;
|
|
objdef:=objdef.childof;
|
|
end;
|
|
end
|
|
else
|
|
{ generic type comparision }
|
|
begin
|
|
eq:=compare_defs_ext(def_from,def_to,currpt.left.nodetype,convtype,pdoper,cdoptions);
|
|
|
|
{ when the types are not equal we need to check
|
|
some special case for parameter passing }
|
|
if (eq<te_equal) then
|
|
begin
|
|
if currpara.varspez in [vs_var,vs_out] then
|
|
begin
|
|
{ para requires an equal type so the previous found
|
|
match was not good enough, reset to incompatible }
|
|
eq:=te_incompatible;
|
|
{ var_para_allowed will return te_equal and te_convert_l1 to
|
|
make a difference for best matching }
|
|
var_para_allowed(eq,currpt.resulttype.def,currpara.vartype.def)
|
|
end
|
|
else
|
|
para_allowed(eq,currpt,def_to);
|
|
end;
|
|
end;
|
|
|
|
{ when a procvar was changed to a call an exact much is
|
|
downgraded to equal. This way an overload call with the
|
|
procvar is choosen. See tb0471 (PFV) }
|
|
if (pt<>currpt) and (eq=te_exact) then
|
|
eq:=te_equal;
|
|
|
|
{ increase correct counter }
|
|
case eq of
|
|
te_exact :
|
|
inc(hp^.exact_count);
|
|
te_equal :
|
|
inc(hp^.equal_count);
|
|
te_convert_l1 :
|
|
inc(hp^.cl1_count);
|
|
te_convert_l2 :
|
|
inc(hp^.cl2_count);
|
|
te_convert_l3 :
|
|
inc(hp^.cl3_count);
|
|
te_convert_operator :
|
|
inc(hp^.coper_count);
|
|
te_incompatible :
|
|
hp^.invalid:=true;
|
|
else
|
|
internalerror(200212072);
|
|
end;
|
|
|
|
{ stop checking when an incompatible parameter is found }
|
|
if hp^.invalid then
|
|
begin
|
|
{ store the current parameter info for
|
|
a nice error message when no procedure is found }
|
|
hp^.wrongparaidx:=paraidx;
|
|
hp^.wrongparanr:=currparanr;
|
|
break;
|
|
end;
|
|
|
|
{$ifdef EXTDEBUG}
|
|
{ store equal in node tree for dump }
|
|
currpara.eqval:=eq;
|
|
{$endif EXTDEBUG}
|
|
|
|
{ maybe release temp currpt }
|
|
if releasecurrpt then
|
|
currpt.free;
|
|
|
|
{ next parameter in the call tree }
|
|
pt:=tcallparanode(pt.right);
|
|
|
|
{ next parameter for definition, only goto next para
|
|
if we're out of the varargs }
|
|
if not(po_varargs in hp^.data.procoptions) or
|
|
(currparanr<=hp^.data.maxparacount) then
|
|
begin
|
|
{ Ignore vs_hidden parameters }
|
|
repeat
|
|
dec(paraidx);
|
|
until (paraidx<0) or not(vo_is_hidden_para in tparavarsym(hp^.data.paras[paraidx]).varoptions);
|
|
end;
|
|
dec(currparanr);
|
|
end;
|
|
if not(hp^.invalid) and
|
|
(assigned(pt) or (paraidx>=0) or (currparanr<>0)) then
|
|
internalerror(200212141);
|
|
{ next candidate }
|
|
hp:=hp^.next;
|
|
end;
|
|
end;
|
|
|
|
|
|
function is_better_candidate(currpd,bestpd:pcandidate):integer;
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var
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res : integer;
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begin
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{
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Return values:
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> 0 when currpd is better than bestpd
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< 0 when bestpd is better than currpd
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= 0 when both are equal
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To choose the best candidate we use the following order:
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- Incompatible flag
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- (Smaller) Number of convert operator parameters.
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- (Smaller) Number of convertlevel 2 parameters.
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- (Smaller) Number of convertlevel 1 parameters.
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- (Bigger) Number of exact parameters.
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- (Smaller) Number of equal parameters.
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- (Smaller) Total of ordinal distance. For example, the distance of a word
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to a byte is 65535-255=65280.
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}
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if bestpd^.invalid then
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begin
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if currpd^.invalid then
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res:=0
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else
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res:=1;
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end
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else
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if currpd^.invalid then
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res:=-1
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else
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begin
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{ less operator parameters? }
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res:=(bestpd^.coper_count-currpd^.coper_count);
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if (res=0) then
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begin
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{ less cl3 parameters? }
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res:=(bestpd^.cl3_count-currpd^.cl3_count);
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if (res=0) then
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begin
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{ less cl2 parameters? }
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res:=(bestpd^.cl2_count-currpd^.cl2_count);
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if (res=0) then
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begin
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{ less cl1 parameters? }
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res:=(bestpd^.cl1_count-currpd^.cl1_count);
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if (res=0) then
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begin
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{ more exact parameters? }
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res:=(currpd^.exact_count-bestpd^.exact_count);
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if (res=0) then
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begin
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{ less equal parameters? }
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res:=(bestpd^.equal_count-currpd^.equal_count);
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if (res=0) then
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begin
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{ smaller ordinal distance? }
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if (currpd^.ordinal_distance<bestpd^.ordinal_distance) then
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res:=1
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else
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if (currpd^.ordinal_distance>bestpd^.ordinal_distance) then
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res:=-1
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else
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res:=0;
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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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end;
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end;
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is_better_candidate:=res;
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end;
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|
|
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function tcallcandidates.choose_best(var bestpd:tabstractprocdef):integer;
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var
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besthpstart,
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hp : pcandidate;
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cntpd,
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|
res : integer;
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begin
|
|
{
|
|
Returns the number of candidates left and the
|
|
first candidate is returned in pdbest
|
|
}
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|
{ Setup the first procdef as best, only count it as a result
|
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when it is valid }
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|
bestpd:=FProcs^.data;
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if FProcs^.invalid then
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cntpd:=0
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else
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cntpd:=1;
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if assigned(FProcs^.next) then
|
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begin
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besthpstart:=FProcs;
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hp:=FProcs^.next;
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while assigned(hp) do
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|
begin
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res:=is_better_candidate(hp,besthpstart);
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if (res>0) then
|
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begin
|
|
{ hp is better, flag all procs to be incompatible }
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|
while (besthpstart<>hp) do
|
|
begin
|
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besthpstart^.invalid:=true;
|
|
besthpstart:=besthpstart^.next;
|
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end;
|
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{ besthpstart is already set to hp }
|
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bestpd:=besthpstart^.data;
|
|
cntpd:=1;
|
|
end
|
|
else
|
|
if (res<0) then
|
|
begin
|
|
{ besthpstart is better, flag current hp to be incompatible }
|
|
hp^.invalid:=true;
|
|
end
|
|
else
|
|
begin
|
|
{ res=0, both are valid }
|
|
if not hp^.invalid then
|
|
inc(cntpd);
|
|
end;
|
|
hp:=hp^.next;
|
|
end;
|
|
end;
|
|
|
|
result:=cntpd;
|
|
end;
|
|
|
|
|
|
procedure tcallcandidates.find_wrong_para;
|
|
var
|
|
currparanr : smallint;
|
|
hp : pcandidate;
|
|
pt : tcallparanode;
|
|
wrongpara : tparavarsym;
|
|
begin
|
|
{ Only process the first overloaded procdef }
|
|
hp:=FProcs;
|
|
{ Find callparanode corresponding to the argument }
|
|
pt:=tcallparanode(FParanode);
|
|
currparanr:=FParalength;
|
|
while assigned(pt) and
|
|
(currparanr>hp^.wrongparanr) do
|
|
begin
|
|
pt:=tcallparanode(pt.right);
|
|
dec(currparanr);
|
|
end;
|
|
if (currparanr<>hp^.wrongparanr) or
|
|
not assigned(pt) then
|
|
internalerror(200212094);
|
|
{ Show error message, when it was a var or out parameter
|
|
guess that it is a missing typeconv }
|
|
wrongpara:=tparavarsym(hp^.data.paras[hp^.wrongparaidx]);
|
|
if wrongpara.varspez in [vs_var,vs_out] then
|
|
begin
|
|
{ Maybe passing the correct type but passing a const to var parameter }
|
|
if (compare_defs(pt.resulttype.def,wrongpara.vartype.def,pt.nodetype)<>te_incompatible) and
|
|
not valid_for_var(pt.left,true) then
|
|
CGMessagePos(pt.left.fileinfo,type_e_variable_id_expected)
|
|
else
|
|
CGMessagePos2(pt.left.fileinfo,parser_e_call_by_ref_without_typeconv,
|
|
FullTypeName(pt.left.resulttype.def,wrongpara.vartype.def),
|
|
FullTypeName(wrongpara.vartype.def,pt.left.resulttype.def))
|
|
end
|
|
else
|
|
CGMessagePos3(pt.left.fileinfo,type_e_wrong_parameter_type,tostr(hp^.wrongparanr),
|
|
FullTypeName(pt.left.resulttype.def,wrongpara.vartype.def),
|
|
FullTypeName(wrongpara.vartype.def,pt.left.resulttype.def));
|
|
end;
|
|
|
|
|
|
procedure check_hints(const srsym: tsym; const symoptions: tsymoptions);
|
|
begin
|
|
if not assigned(srsym) then
|
|
internalerror(200602051);
|
|
if sp_hint_deprecated in symoptions then
|
|
Message1(sym_w_deprecated_symbol,srsym.realname);
|
|
if sp_hint_platform in symoptions then
|
|
Message1(sym_w_non_portable_symbol,srsym.realname);
|
|
if sp_hint_unimplemented in symoptions then
|
|
Message1(sym_w_non_implemented_symbol,srsym.realname);
|
|
end;
|
|
|
|
|
|
procedure check_ranges(const location: tfileposinfo; source: tnode; destdef: tdef);
|
|
begin
|
|
{ check if the assignment may cause a range check error }
|
|
{ if its not explicit, and only if the values are }
|
|
{ ordinals, enumdef and floatdef }
|
|
if assigned(destdef) and
|
|
(destdef.deftype in [enumdef,orddef,floatdef]) and
|
|
not is_boolean(destdef) and
|
|
assigned(source.resulttype.def) and
|
|
(source.resulttype.def.deftype in [enumdef,orddef,floatdef]) and
|
|
not is_boolean(source.resulttype.def) and
|
|
not is_constrealnode(source) then
|
|
begin
|
|
if (destdef.size < source.resulttype.def.size) then
|
|
begin
|
|
if (cs_check_range in aktlocalswitches) then
|
|
MessagePos(location,type_w_smaller_possible_range_check)
|
|
else
|
|
MessagePos(location,type_h_smaller_possible_range_check);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
end.
|