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4dee36b64b
implicit pointer types into the nestedfpstruct, so that the original
parameter is properly changed when updated from inside nested routines
git-svn-id: branches/jvmbackend@19645 -
238 lines
8.7 KiB
ObjectPascal
238 lines
8.7 KiB
ObjectPascal
{
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Copyright (c) 2011 by Jonas Maebe
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Support for load nodes on targets that have to group all local variables
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and parameters accessed by nested routines into structs (and then pass the
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address of these structs to nested routines rather than the frame pointer,
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and access the local variables as fields thereof)
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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 ncgnstld;
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{$i fpcdefs.inc}
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interface
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uses
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node,
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symtype,
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nld,
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ncgld;
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type
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tcgnestloadnode = class(tcgloadnode)
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protected
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nestsym: tsym;
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nestsymderef: tderef;
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procedure generate_nested_access(vs: tsym);override;
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function keep_param_address_in_nested_struct: boolean; virtual;
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public
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function pass_typecheck: tnode; override;
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function pass_1:tnode;override;
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function dogetcopy: tnode; override;
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function docompare(p: tnode): boolean; override;
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constructor ppuload(t: tnodetype; ppufile: tcompilerppufile); override;
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procedure ppuwrite(ppufile: tcompilerppufile); override;
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procedure buildderefimpl; override;
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procedure derefimpl; override;
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end;
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implementation
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uses
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cutils,verbose,globtype,globals,systems,constexp,
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symnot,
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defutil,defcmp,
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htypechk,pass_1,procinfo,paramgr,
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cpuinfo,
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symconst,symbase,symsym,symdef,symtable,symcreat,
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ncon,ninl,ncnv,nmem,ncal,nutils,nbas,
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pass_2,cgbase
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;
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{*****************************************************************************
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TCGNESTLOADNODE
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*****************************************************************************}
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procedure tcgnestloadnode.generate_nested_access(vs: tsym);
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begin
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{ left has been transformed into a string of accesses that result in
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the location of the original variable's copy in the appropriate
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parentfpstruct (via tcgnestloadparentfpnode.pass_1). In case it is a
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var/out/constref parameter, that "copy" will have been a copy of the
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address so the normal handling of such parameters in ncgld is ok) }
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secondpass(left);
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location:=left.location;
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end;
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function tcgnestloadnode.keep_param_address_in_nested_struct: boolean;
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begin
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result:=is_addr_param_load;
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end;
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function tcgnestloadnode.pass_typecheck: tnode;
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var
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nestedvars: tsym;
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begin
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result:=inherited pass_typecheck;
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if assigned(result) then
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exit;
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case symtableentry.typ of
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paravarsym,
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localvarsym :
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begin
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{ Nested variable? Then we have to move it to a structure that
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can be passed by reference to nested routines }
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if assigned(current_procinfo) and
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(symtable.symtabletype in [localsymtable,parasymtable]) and
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((symtable.symtablelevel<>current_procinfo.procdef.parast.symtablelevel) or
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{ also redirect loads of locals/paras that have been moved to
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the parentfpstruct inside the routine in which they were
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originally declared, except in the initialisation code for
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the parentfpstruct (nf_internal flag) }
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(tabstractnormalvarsym(symtableentry).inparentfpstruct and
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not(nf_internal in flags))) then
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begin
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{ get struct holding all locals accessed by nested routines }
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nestedvars:=tprocdef(symtable.defowner).parentfpstruct;
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{ don't add the parentfpstruct to itself! }
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if nestedvars=symtableentry then
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exit;
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if not assigned(nestedvars) then
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begin
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{ create this struct }
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build_parentfpstruct(tprocdef(symtable.defowner));
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nestedvars:=tprocdef(symtable.defowner).parentfpstruct;
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end;
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{ store result for use in pass_1 }
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nestsym:=maybe_add_sym_to_parentfpstruct(tprocdef(symtableentry.owner.defowner),symtableentry,resultdef,keep_param_address_in_nested_struct);
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{ left normally holds the parentfp node. If it's not assigned,
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this is an access to a local variable/para from the routine
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in which it was actually declared -> redirect to its
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equivalent in the parentfp struct }
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if not assigned(left) then
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begin
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left:=caddrnode.create_internal(cloadnode.create(tprocdef(symtableentry.owner.defowner).parentfpstruct,tprocdef(symtableentry.owner.defowner).parentfpstruct.owner));
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include(left.flags,nf_typedaddr);
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end;
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typecheckpass(left);
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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 tcgnestloadnode.pass_1:tnode;
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var
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thissym,
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nestedvars: tsym;
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nestedvarsdef: tdef;
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begin
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result:=inherited;
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if assigned(result) then
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exit;
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case symtableentry.typ of
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paravarsym,
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localvarsym :
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begin
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{ Nested variable? Then we have to move it to a structure that
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can be passed by reference to nested routines }
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if assigned(current_procinfo) and
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(symtable.symtabletype in [localsymtable,parasymtable]) and
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((symtable.symtablelevel<>current_procinfo.procdef.parast.symtablelevel) or
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(tabstractnormalvarsym(symtableentry).inparentfpstruct and
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not(nf_internal in flags))) then
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begin
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{ get struct holding all locals accessed by nested routines }
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nestedvars:=tprocdef(symtable.defowner).parentfpstruct;
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if not assigned(nestedvars) then
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begin
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{ create this struct }
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build_parentfpstruct(tprocdef(symtable.defowner));
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nestedvars:=tprocdef(symtable.defowner).parentfpstruct;
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end;
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nestedvarsdef:=tlocalvarsym(nestedvars).vardef;
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if nestedvars<>symtableentry then
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thissym:=nestsym
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else
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thissym:=find_sym_in_parentfpstruct(tprocdef(symtableentry.owner.defowner),symtableentry);
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if not assigned(thissym) then
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internalerror(2011060406);
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{ firstpass the parentfpnode. This will transform it into
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a load of the appropriate parentfpstruct }
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if not assigned(left) then
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internalerror(2011060104);
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firstpass(left);
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{ subscript it to get the variable }
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left:=csubscriptnode.create(thissym,cderefnode.create(left));
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firstpass(left);
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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 tcgnestloadnode.dogetcopy: tnode;
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begin
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result:=inherited dogetcopy;
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tcgnestloadnode(result).nestsym:=nestsym;
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end;
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function tcgnestloadnode.docompare(p: tnode): boolean;
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begin
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result:=
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inherited docompare(p) and
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(tcgnestloadnode(p).nestsym=nestsym);
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end;
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constructor tcgnestloadnode.ppuload(t: tnodetype; ppufile: tcompilerppufile);
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begin
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inherited ppuload(t, ppufile);
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ppufile.getderef(nestsymderef);
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end;
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procedure tcgnestloadnode.ppuwrite(ppufile: tcompilerppufile);
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begin
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inherited ppuwrite(ppufile);
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ppufile.putderef(nestsymderef);
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end;
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procedure tcgnestloadnode.buildderefimpl;
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begin
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inherited buildderefimpl;
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nestsymderef.build(nestsym);
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end;
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procedure tcgnestloadnode.derefimpl;
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begin
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inherited derefimpl;
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nestsym:=tsym(nestsymderef.resolve);
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end;
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begin
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cloadnode:=tcgnestloadnode;
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end.
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