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419 lines
15 KiB
ObjectPascal
419 lines
15 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1993-98 by Florian Klaempfl
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Type checking and register allocation for load/assignment nodes
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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 tcld;
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interface
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uses
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tree;
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procedure firstload(var p : ptree);
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procedure firstassignment(var p : ptree);
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procedure firstfuncret(var p : ptree);
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procedure firstarrayconstruct(var p : ptree);
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procedure firsttype(var p : ptree);
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implementation
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uses
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cobjects,verbose,globals,systems,
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symtable,aasm,types,
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hcodegen,htypechk,pass_1,
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tccnv
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{$ifdef i386}
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,i386,tgeni386
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{$endif}
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{$ifdef m68k}
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,m68k,tgen68k
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{$endif}
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;
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{*****************************************************************************
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FirstLoad
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*****************************************************************************}
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procedure firstload(var p : ptree);
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begin
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p^.location.loc:=LOC_REFERENCE;
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p^.registers32:=0;
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p^.registersfpu:=0;
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{$ifdef SUPPORT_MMX}
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p^.registersmmx:=0;
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{$endif SUPPORT_MMX}
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clear_reference(p^.location.reference);
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if p^.symtableentry^.typ=funcretsym then
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begin
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putnode(p);
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p:=genzeronode(funcretn);
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p^.funcretprocinfo:=pprocinfo(pfuncretsym(p^.symtableentry)^.funcretprocinfo);
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p^.retdef:=pfuncretsym(p^.symtableentry)^.funcretdef;
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firstpass(p);
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exit;
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end;
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if p^.symtableentry^.typ=absolutesym then
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begin
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p^.resulttype:=pabsolutesym(p^.symtableentry)^.definition;
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if pabsolutesym(p^.symtableentry)^.abstyp=tovar then
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p^.symtableentry:=pabsolutesym(p^.symtableentry)^.ref;
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p^.symtable:=p^.symtableentry^.owner;
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p^.is_absolute:=true;
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end;
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case p^.symtableentry^.typ of
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absolutesym :;
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varsym :
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begin
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if not(p^.is_absolute) and (p^.resulttype=nil) then
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p^.resulttype:=pvarsym(p^.symtableentry)^.definition;
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if ((p^.symtable^.symtabletype=parasymtable) or
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(p^.symtable^.symtabletype=localsymtable)) and
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(lexlevel>p^.symtable^.symtablelevel) then
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begin
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{ sollte sich die Variable in einem anderen Stackframe }
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{ befinden, so brauchen wir ein Register zum Dereferenceieren }
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if (p^.symtable^.symtablelevel)>0 then
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begin
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p^.registers32:=1;
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{ further, the variable can't be put into a register }
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pvarsym(p^.symtableentry)^.var_options:=
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pvarsym(p^.symtableentry)^.var_options and not vo_regable;
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end;
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end;
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if (pvarsym(p^.symtableentry)^.varspez=vs_const) then
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p^.location.loc:=LOC_MEM;
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{ we need a register for call by reference parameters }
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if (pvarsym(p^.symtableentry)^.varspez=vs_var) or
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((pvarsym(p^.symtableentry)^.varspez=vs_const) and
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dont_copy_const_param(pvarsym(p^.symtableentry)^.definition)
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) or
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{ call by value open arrays are also indirect addressed }
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is_open_array(pvarsym(p^.symtableentry)^.definition) then
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p^.registers32:=1;
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if p^.symtable^.symtabletype=withsymtable then
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inc(p^.registers32);
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{ a class variable is a pointer !!!
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yes, but we have to resolve the reference in an
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appropriate tree node (FK)
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if (pvarsym(p^.symtableentry)^.definition^.deftype=objectdef) and
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((pobjectdef(pvarsym(p^.symtableentry)^.definition)^.options and oois_class)<>0) then
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p^.registers32:=1;
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}
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{ count variable references }
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if must_be_valid and p^.is_first then
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begin
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if pvarsym(p^.symtableentry)^.is_valid=2 then
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if (assigned(pvarsym(p^.symtableentry)^.owner) and assigned(aktprocsym)
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and (pvarsym(p^.symtableentry)^.owner = aktprocsym^.definition^.localst)) then
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CGMessage1(sym_n_uninitialized_local_variable,pvarsym(p^.symtableentry)^.name);
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end;
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if count_ref then
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begin
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if (p^.is_first) then
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begin
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if (pvarsym(p^.symtableentry)^.is_valid=2) then
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pvarsym(p^.symtableentry)^.is_valid:=1;
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p^.is_first:=false;
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end;
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end;
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{ this will create problem with local var set by
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under_procedures
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if (assigned(pvarsym(p^.symtableentry)^.owner) and assigned(aktprocsym)
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and ((pvarsym(p^.symtableentry)^.owner = aktprocsym^.definition^.localst)
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or (pvarsym(p^.symtableentry)^.owner = aktprocsym^.definition^.localst))) then }
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if t_times<1 then
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inc(pvarsym(p^.symtableentry)^.refs)
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else
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inc(pvarsym(p^.symtableentry)^.refs,t_times);
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end;
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typedconstsym :
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if not p^.is_absolute then
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p^.resulttype:=ptypedconstsym(p^.symtableentry)^.definition;
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procsym :
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begin
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if assigned(pprocsym(p^.symtableentry)^.definition^.nextoverloaded) then
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CGMessage(parser_e_no_overloaded_procvars);
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p^.resulttype:=pprocsym(p^.symtableentry)^.definition;
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end;
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else internalerror(3);
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end;
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end;
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{*****************************************************************************
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FirstAssignment
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*****************************************************************************}
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procedure firstassignment(var p : ptree);
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var
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store_valid : boolean;
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hp : ptree;
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begin
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store_valid:=must_be_valid;
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must_be_valid:=false;
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{ must be made unique }
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set_unique(p^.left);
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firstpass(p^.left);
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if codegenerror then
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exit;
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{ assignements to open arrays aren't allowed }
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if is_open_array(p^.left^.resulttype) then
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CGMessage(type_e_mismatch);
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{ test if we can avoid copying string to temp
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as in s:=s+...; (PM) }
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{$ifdef dummyi386}
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if ((p^.right^.treetype=addn) or (p^.right^.treetype=subn)) and
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equal_trees(p^.left,p^.right^.left) and
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(ret_in_acc(p^.left^.resulttype)) and
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(not cs_rangechecking in aktmoduleswitches^) then
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begin
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disposetree(p^.right^.left);
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hp:=p^.right;
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p^.right:=p^.right^.right;
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if hp^.treetype=addn then
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p^.assigntyp:=at_plus
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else
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p^.assigntyp:=at_minus;
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putnode(hp);
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end;
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if p^.assigntyp<>at_normal then
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begin
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{ for fpu type there is no faster way }
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if is_fpu(p^.left^.resulttype) then
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case p^.assigntyp of
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at_plus : p^.right:=gennode(addn,getcopy(p^.left),p^.right);
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at_minus : p^.right:=gennode(subn,getcopy(p^.left),p^.right);
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at_star : p^.right:=gennode(muln,getcopy(p^.left),p^.right);
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at_slash : p^.right:=gennode(slashn,getcopy(p^.left),p^.right);
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end;
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end;
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{$endif i386}
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must_be_valid:=true;
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firstpass(p^.right);
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must_be_valid:=store_valid;
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if codegenerror then
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exit;
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{ some string functions don't need conversion, so treat them separatly }
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if is_shortstring(p^.left^.resulttype) and (assigned(p^.right^.resulttype)) then
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begin
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if not (is_shortstring(p^.right^.resulttype) or
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is_ansistring(p^.right^.resulttype) or
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((p^.right^.resulttype^.deftype=orddef) and (porddef(p^.right^.resulttype)^.typ=uchar))) then
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begin
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p^.right:=gentypeconvnode(p^.right,p^.left^.resulttype);
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firstpass(p^.right);
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if codegenerror then
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exit;
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end;
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{ we call STRCOPY }
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procinfo.flags:=procinfo.flags or pi_do_call;
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hp:=p^.right;
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{ test for s:=s+anything ... }
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{ the problem is for
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s:=s+s+s;
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this is broken here !! }
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{ while hp^.treetype=addn do hp:=hp^.left;
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if equal_trees(p^.left,hp) then
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begin
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p^.concat_string:=true;
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hp:=p^.right;
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while hp^.treetype=addn do
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begin
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hp^.use_strconcat:=true;
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hp:=hp^.left;
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end;
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end; }
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end
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else
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begin
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if (p^.right^.treetype=realconstn) then
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begin
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if p^.left^.resulttype^.deftype=floatdef then
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begin
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case pfloatdef(p^.left^.resulttype)^.typ of
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s32real : p^.right^.realtyp:=ait_real_32bit;
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s64real : p^.right^.realtyp:=ait_real_64bit;
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s80real : p^.right^.realtyp:=ait_real_extended;
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{ what about f32bit and s64bit }
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else
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begin
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p^.right:=gentypeconvnode(p^.right,p^.left^.resulttype);
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{ nochmal firstpass wegen der Typkonvertierung aufrufen }
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firstpass(p^.right);
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if codegenerror then
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exit;
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end;
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end;
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end;
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end
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else
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begin
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p^.right:=gentypeconvnode(p^.right,p^.left^.resulttype);
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firstpass(p^.right);
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if codegenerror then
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exit;
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end;
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end;
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p^.resulttype:=voiddef;
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{
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p^.registers32:=max(p^.left^.registers32,p^.right^.registers32);
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p^.registersfpu:=max(p^.left^.registersfpu,p^.right^.registersfpu);
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}
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p^.registers32:=p^.left^.registers32+p^.right^.registers32;
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p^.registersfpu:=max(p^.left^.registersfpu,p^.right^.registersfpu);
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{$ifdef SUPPORT_MMX}
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p^.registersmmx:=max(p^.left^.registersmmx,p^.right^.registersmmx);
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{$endif SUPPORT_MMX}
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end;
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{*****************************************************************************
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FirstFuncRet
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*****************************************************************************}
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procedure firstfuncret(var p : ptree);
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begin
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p^.resulttype:=p^.retdef;
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p^.location.loc:=LOC_REFERENCE;
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if ret_in_param(p^.retdef) or
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(@procinfo<>pprocinfo(p^.funcretprocinfo)) then
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p^.registers32:=1;
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{ no claim if setting higher return value_str }
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if must_be_valid and
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(@procinfo=pprocinfo(p^.funcretprocinfo)) and
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not procinfo.funcret_is_valid then
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CGMessage(sym_w_function_result_not_set);
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if count_ref then
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pprocinfo(p^.funcretprocinfo)^.funcret_is_valid:=true;
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end;
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{*****************************************************************************
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FirstArrayConstruct
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*****************************************************************************}
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procedure firstarrayconstruct(var p : ptree);
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var
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pd : pdef;
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hp : ptree;
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len : longint;
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varia : boolean;
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begin
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{ are we allowing array constructor? Then convert it to a set }
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if not allow_array_constructor then
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begin
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arrayconstructor_to_set(p);
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firstpass(p);
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exit;
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end;
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{ only pass left tree, right tree contains next construct if any }
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pd:=nil;
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len:=0;
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varia:=false;
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if assigned(p^.left) then
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begin
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hp:=p;
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while assigned(hp) do
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begin
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firstpass(hp^.left);
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case hp^.left^.resulttype^.deftype of
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floatdef : begin
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hp^.left:=gentypeconvnode(hp^.left,s80floatdef);
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firstpass(hp^.left);
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end;
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end;
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if (pd=nil) then
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pd:=hp^.left^.resulttype
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else
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if (not varia) and (not is_equal(pd,hp^.left^.resulttype)) then
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begin
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varia:=true;
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Comment(V_Warning,'Variant type found !!');
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end;
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inc(len);
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hp:=hp^.right;
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end;
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end;
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calcregisters(p,0,0,0);
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p^.resulttype:=new(parraydef,init(0,len-1,pd));
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parraydef(p^.resulttype)^.IsConstructor:=true;
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parraydef(p^.resulttype)^.IsVariant:=varia;
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p^.location.loc:=LOC_REFERENCE;
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end;
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{*****************************************************************************
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FirstArrayConstructRange
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*****************************************************************************}
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procedure firstarrayconstructrange(var p : ptree);
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begin
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{ This is not allowed, it's only to support sets when parsing the [a..b] }
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Internalerror(4236);
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Codegenerror:=true;
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end;
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{*****************************************************************************
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Type
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*****************************************************************************}
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procedure firsttype(var p : ptree);
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begin
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{ do nothing, p^.resulttype is already set }
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end;
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end.
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{
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$Log$
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Revision 1.5 1998-10-06 20:49:12 peter
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* m68k compiler compiles again
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Revision 1.4 1998/09/28 11:07:40 peter
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+ floatdef support for array of const
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Revision 1.3 1998/09/27 10:16:27 florian
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* type casts pchar<->ansistring fixed
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* ansistring[..] calls does now an unique call
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Revision 1.2 1998/09/24 15:13:48 peter
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* fixed type node which was always set to void :(
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Revision 1.1 1998/09/23 20:42:24 peter
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* splitted pass_1
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}
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