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275 lines
11 KiB
ObjectPascal
275 lines
11 KiB
ObjectPascal
{
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Copyright (C) 2010 by Jonas Maebe
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This unit handles the temporary variables for the JVM
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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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{
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This unit handles the temporary variables for the JVM.
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}
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unit tgcpu;
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{$i fpcdefs.inc}
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interface
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uses
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globtype,
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aasmdata,
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cgutils,
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symtype,tgobj;
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type
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{ ttgjvm }
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ttgjvm = class(ttgobj)
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protected
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procedure getimplicitobjtemp(list: TAsmList; def: tdef; temptype: ttemptype; out ref: treference);
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function getifspecialtemp(list: TAsmList; def: tdef; forcesize: asizeint; temptype: ttemptype; out ref: treference): boolean;
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procedure alloctemp(list: TAsmList; size: asizeint; alignment: shortint; temptype: ttemptype; def: tdef; fini: boolean; out ref: treference); override;
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public
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procedure setfirsttemp(l : asizeint); override;
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procedure getlocal(list: TAsmList; size: asizeint; alignment: shortint; def: tdef; var ref: treference); override;
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procedure gethltemp(list: TAsmList; def: tdef; forcesize: asizeint; temptype: ttemptype; out ref: treference); override;
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procedure gethltempmanaged(list: TAsmList; def: tdef; temptype: ttemptype; out ref: treference); override;
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end;
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implementation
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uses
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verbose,
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cgbase,
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symconst,symtable,symdef,symsym,symcpu,defutil,
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cpubase,aasmbase,aasmcpu,
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hlcgobj,hlcgcpu;
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{ ttgjvm }
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procedure ttgjvm.getimplicitobjtemp(list: TAsmList; def: tdef; temptype: ttemptype; out ref: treference);
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var
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sym: tsym;
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pd: tprocdef;
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begin
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gettemp(list,java_jlobject.size,java_jlobject.alignment,temptype,ref);
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list.concat(taicpu.op_sym(a_new,current_asmdata.RefAsmSymbol(tabstractrecorddef(def).jvm_full_typename(true),AT_METADATA)));
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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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list.concat(taicpu.op_none(a_dup));
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thlcgjvm(hlcg).incstack(list,2);
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{ call the constructor }
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sym:=tsym(tabstractrecorddef(def).symtable.find('CREATE'));
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if assigned(sym) and
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(sym.typ=procsym) then
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begin
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pd:=tprocsym(sym).find_bytype_parameterless(potype_constructor);
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if not assigned(pd) then
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internalerror(2011032701);
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end
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else
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internalerror(2011060301);
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hlcg.a_call_name(list,pd,pd.mangledname,[],nil,false);
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thlcgjvm(hlcg).decstack(list,1);
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{ store reference to instance }
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thlcgjvm(hlcg).a_load_stack_ref(list,java_jlobject,ref,0);
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end;
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function ttgjvm.getifspecialtemp(list: TAsmList; def: tdef; forcesize: asizeint; temptype: ttemptype; out ref: treference): boolean;
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var
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eledef: tdef;
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ndim: longint;
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sym: tsym;
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pd: tprocdef;
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begin
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result:=false;
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case def.typ of
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arraydef:
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begin
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if not is_dynamic_array(def) then
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begin
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{ allocate an array of the right size }
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gettemp(list,java_jlobject.size,java_jlobject.alignment,temptype,ref);
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ndim:=0;
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eledef:=def;
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repeat
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if forcesize<>-1 then
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thlcgjvm(hlcg).a_load_const_stack(list,s32inttype,forcesize div tarraydef(eledef).elesize,R_INTREGISTER)
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else
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thlcgjvm(hlcg).a_load_const_stack(list,s32inttype,tarraydef(eledef).elecount,R_INTREGISTER);
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eledef:=tarraydef(eledef).elementdef;
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inc(ndim);
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forcesize:=-1;
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until (eledef.typ<>arraydef) or
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is_dynamic_array(eledef);
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eledef:=tarraydef(def).elementdef;
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thlcgjvm(hlcg).g_newarray(list,def,ndim);
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thlcgjvm(hlcg).a_load_stack_ref(list,java_jlobject,ref,0);
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result:=true;
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end;
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end;
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recorddef:
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begin
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getimplicitobjtemp(list,def,temptype,ref);
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result:=true;
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end;
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setdef:
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begin
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if tsetdef(def).elementdef.typ=enumdef then
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begin
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{ load enum class type }
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list.concat(taicpu.op_sym(a_ldc,current_asmdata.RefAsmSymbol(tcpuenumdef(tenumdef(tsetdef(def).elementdef).getbasedef).classdef.jvm_full_typename(true),AT_METADATA)));
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thlcgjvm(hlcg).incstack(current_asmdata.CurrAsmList,1);
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{ call tenumset.noneOf() class method }
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sym:=tsym(tobjectdef(java_juenumset).symtable.find('NONEOF'));
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if assigned(sym) and
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(sym.typ=procsym) then
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begin
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if tprocsym(sym).procdeflist.Count<>1 then
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internalerror(2011062801);
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pd:=tprocdef(tprocsym(sym).procdeflist[0]);
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hlcg.a_call_name(list,pd,pd.mangledname,[],nil,false);
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end;
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{ static calls method replaces parameter with set instance
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-> no change in stack height }
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end
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else
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begin
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list.concat(taicpu.op_sym(a_new,current_asmdata.RefAsmSymbol(java_jubitset.jvm_full_typename(true),AT_METADATA)));
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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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list.concat(taicpu.op_none(a_dup));
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thlcgjvm(hlcg).incstack(list,2);
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{ call the constructor }
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sym:=tsym(java_jubitset.symtable.find('CREATE'));
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if assigned(sym) and
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(sym.typ=procsym) then
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begin
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pd:=tprocsym(sym).find_bytype_parameterless(potype_constructor);
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if not assigned(pd) then
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internalerror(2011062802);
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end
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else
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internalerror(2011062803);
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hlcg.a_call_name(list,pd,pd.mangledname,[],nil,false);
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{ duplicate self pointer is removed }
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thlcgjvm(hlcg).decstack(list,1);
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end;
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{ store reference to instance }
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gettemp(list,java_jlobject.size,java_jlobject.alignment,temptype,ref);
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thlcgjvm(hlcg).a_load_stack_ref(list,java_jlobject,ref,0);
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result:=true;
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end;
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procvardef:
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begin
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if not tprocvardef(def).is_addressonly then
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begin
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getimplicitobjtemp(list,tcpuprocvardef(def).classdef,temptype,ref);
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result:=true;
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end;
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end;
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stringdef:
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begin
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if is_shortstring(def) then
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begin
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gettemp(list,java_jlobject.size,java_jlobject.alignment,temptype,ref);
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{ add the maxlen parameter (s8inttype because parameters must
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be sign extended) }
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thlcgjvm(hlcg).a_load_const_stack(list,s8inttype,shortint(tstringdef(def).len),R_INTREGISTER);
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{ call the constructor }
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sym:=tsym(tobjectdef(java_shortstring).symtable.find('CREATEEMPTY'));
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if assigned(sym) and
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(sym.typ=procsym) then
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begin
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if tprocsym(sym).procdeflist.Count<>1 then
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internalerror(2011052404);
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pd:=tprocdef(tprocsym(sym).procdeflist[0]);
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hlcg.a_call_name(list,pd,pd.mangledname,[],nil,false);
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end;
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{ static calls method replaces parameter with string instance
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-> no change in stack height }
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{ store reference to instance }
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thlcgjvm(hlcg).a_load_stack_ref(list,java_jlobject,ref,0);
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result:=true;
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end;
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end;
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filedef:
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begin
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case tfiledef(def).filetyp of
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ft_text:
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result:=getifspecialtemp(list,search_system_type('TEXTREC').typedef,forcesize,temptype,ref);
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ft_typed,
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ft_untyped:
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result:=getifspecialtemp(list,search_system_type('FILEREC').typedef,forcesize,temptype,ref);
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end;
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end;
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else
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;
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end;
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end;
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procedure ttgjvm.alloctemp(list: TAsmList; size: asizeint; alignment: shortint; temptype: ttemptype; def: tdef; fini: boolean; out ref: treference);
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begin
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{ the JVM only supports 1 slot (= 4 bytes in FPC) and 2 slot (= 8 bytes in
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FPC) temps on the stack. double and int64 are 2 slots, the rest is one slot.
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There are no problems with reusing the same slot for a value of a different
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type. There are no alignment requirements either. }
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if size<4 then
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size:=4;
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if not(size in [4,8]) then
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internalerror(2010121401);
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{ don't pass on "def", since we don't care if a slot is used again for a
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different type }
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inherited alloctemp(list, size shr 2, 1, temptype, nil, false, ref);
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end;
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procedure ttgjvm.setfirsttemp(l: asizeint);
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begin
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firsttemp:=l;
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lasttemp:=l;
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end;
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procedure ttgjvm.getlocal(list: TAsmList; size: asizeint; alignment: shortint; def: tdef; var ref: treference);
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begin
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if not getifspecialtemp(list,def,size,tt_persistent,ref) then
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inherited;
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end;
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procedure ttgjvm.gethltemp(list: TAsmList; def: tdef; forcesize: asizeint; temptype: ttemptype; out ref: treference);
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begin
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if not getifspecialtemp(list,def,forcesize,temptype,ref) then
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inherited;
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end;
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procedure ttgjvm.gethltempmanaged(list: TAsmList; def: tdef; temptype: ttemptype; out ref: treference);
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begin
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gethltemp(list,def,def.size,temptype,ref);
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end;
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begin
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tgobjclass:=ttgjvm;
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end.
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