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https://gitlab.com/freepascal.org/fpc/source.git
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761ff19c7f
to "nil", so that returning them to Java code does not return a nil
pointer
git-svn-id: branches/jvmbackend@18417 -
88 lines
2.7 KiB
ObjectPascal
88 lines
2.7 KiB
ObjectPascal
{
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Copyright (c) 20011 by Jonas Maebe
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JVM version of some node tree helper routines
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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 njvmutil;
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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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ngenutil;
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type
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tjvmnodeutils = class(tnodeutils)
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class function initialize_data_node(p:tnode):tnode; override;
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class function finalize_data_node(p:tnode):tnode; override;
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end;
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implementation
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uses
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verbose,constexp,
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symconst,symtype,symdef,symsym,symbase,symtable,defutil,
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nbas,ncnv,ncon,ninl,ncal,
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pass_1;
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class function tjvmnodeutils.initialize_data_node(p:tnode):tnode;
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begin
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if not assigned(p.resultdef) then
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typecheckpass(p);
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if ((p.resultdef.typ=stringdef) and
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not is_shortstring(p.resultdef) and
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not is_longstring(p.resultdef)) or
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is_dynamic_array(p.resultdef) then
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begin
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{ Always initialise with empty string/array rather than nil. Java
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makes a distinction between an empty string/array and a null
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string/array, but we don't. We therefore have to pick which one we
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use to represent empty strings/arrays. I've chosen empty rather than
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null structures, because otherwise it becomes impossible to return
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an empty string to Java code (it would return null).
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On the consumer side, we do interpret both null and empty as the same
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thing, so Java code can pass in null strings/arrays and we'll
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interpret them correctly.
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}
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result:=cinlinenode.create(in_setlength_x,false,
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ccallparanode.create(genintconstnode(0),
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ccallparanode.create(p,nil)));
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end
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else
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{ records/arrays/... are automatically initialised }
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result:=cnothingnode.create;
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end;
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class function tjvmnodeutils.finalize_data_node(p:tnode):tnode;
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begin
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// do nothing
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result:=cnothingnode.create;
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end;
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begin
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cnodeutils:=tjvmnodeutils;
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end.
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