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eb5814a868
o handle them like for regular classes (return a class instance,
although this is technically not true since they don't return
anything; will be changed in the future)
o because of the previous point, make sure that we handle the
"function result" properly and don't pop too many values from
the evaluation stack when calling one constructor from another
o added "extra_pre_call_code" method used by njvmcal to insert
the "new" opcode to create the new class instance before
calling a constructor
o when a constructor does not call any other constructor (inherited
or otherwise), automatically insert a call to the inherited
parameterless constructor as required by the jvm standard)
TODO: check that *if* an inherited or other constructor is called
from another constructor, that it does so as the first statement/
call
git-svn-id: branches/jvmbackend@18328 -
137 lines
4.5 KiB
ObjectPascal
137 lines
4.5 KiB
ObjectPascal
{
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Copyright (c) 2011 by Jonas Maebe
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JVM-specific code for call 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 njvmcal;
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{$i fpcdefs.inc}
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interface
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uses
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symdef,
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ncgcal;
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type
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{ tjvmcallnode }
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tjvmcallnode = class(tcgcallnode)
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protected
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procedure extra_pre_call_code; override;
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procedure set_result_location(realresdef: tstoreddef); override;
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procedure do_release_unused_return_value;override;
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procedure extra_post_call_code; override;
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end;
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implementation
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uses
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verbose,globtype,
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symconst,symtype,defutil,ncal,
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cgbase,cgutils,tgobj,procinfo,
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cpubase,aasmdata,aasmcpu,
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hlcgobj,hlcgcpu,
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jvmdef;
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{*****************************************************************************
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TJVMCALLNODE
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*****************************************************************************}
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procedure tjvmcallnode.extra_pre_call_code;
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begin
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{ when calling a constructor, first create a new instance, except
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when calling it from another constructor (because then this has
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already been done before calling the current constructor) }
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if procdefinition.typ<>procdef then
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exit;
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if tprocdef(procdefinition).proctypeoption<>potype_constructor then
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exit;
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if (methodpointer.resultdef.typ<>classrefdef) then
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exit;
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current_asmdata.CurrAsmList.concat(taicpu.op_sym(a_new,current_asmdata.RefAsmSymbol(tobjectdef(tprocdef(procdefinition).owner.defowner).jvm_full_typename)));
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{ the constructor doesn't return anything, so put a duplicate of the
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self pointer on the evaluation stack for use as function result
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after the constructor has run }
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current_asmdata.CurrAsmList.concat(taicpu.op_none(a_dup));
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thlcgjvm(hlcg).incstack(2);
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end;
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procedure tjvmcallnode.set_result_location(realresdef: tstoreddef);
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begin
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location_reset_ref(location,LOC_REFERENCE,def_cgsize(realresdef),1);
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tg.gettemp(current_asmdata.CurrAsmList,realresdef.size,1,tt_normal,location.reference);
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end;
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procedure tjvmcallnode.do_release_unused_return_value;
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begin
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if (tprocdef(procdefinition).proctypeoption=potype_constructor) and
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(current_procinfo.procdef.proctypeoption=potype_constructor) then
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exit;
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case resultdef.size of
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0:
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;
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1..4:
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begin
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current_asmdata.CurrAsmList.concat(taicpu.op_none(a_pop));
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thlcgjvm(hlcg).decstack(1);
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end;
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8:
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begin
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current_asmdata.CurrAsmList.concat(taicpu.op_none(a_pop2));
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thlcgjvm(hlcg).decstack(2);
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end
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else
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internalerror(2011010305);
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end;
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end;
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procedure tjvmcallnode.extra_post_call_code;
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var
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totalremovesize: longint;
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realresdef: tdef;
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begin
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if not assigned(typedef) then
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realresdef:=tstoreddef(resultdef)
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else
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realresdef:=tstoreddef(typedef);
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{ a constructor doesn't actually return a value in the jvm }
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if (tprocdef(procdefinition).proctypeoption=potype_constructor) then
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totalremovesize:=pushedparasize
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else
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totalremovesize:=pushedparasize-realresdef.size;
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{ remove parameters from internal evaluation stack counter (in case of
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e.g. no parameters and a result, it can also increase) }
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if totalremovesize>0 then
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thlcgjvm(hlcg).decstack(totalremovesize shr 2)
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else if totalremovesize<0 then
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thlcgjvm(hlcg).incstack((-totalremovesize) shr 2);
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end;
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begin
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ccallnode:=tjvmcallnode;
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end.
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