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{
Copyright (C) 2010 by Jonas Maebe
This unit handles the temporary variables for the JVM
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
{
This unit handles the temporary variables for the JVM.
}
unit tgcpu;
{$i fpcdefs.inc}
interface
uses
globtype,
aasmdata,
cgutils,
symtype,tgobj;
type
{ ttgjvm }
ttgjvm = class(ttgobj)
protected
procedure getimplicitobjtemp(list: TAsmList; def: tdef; temptype: ttemptype; out ref: treference);
function getifspecialtemp(list: TAsmList; def: tdef; forcesize: asizeint; temptype: ttemptype; out ref: treference): boolean;
procedure alloctemp(list: TAsmList; size: asizeint; alignment: shortint; temptype: ttemptype; def: tdef; fini: boolean; out ref: treference); override;
public
procedure setfirsttemp(l : asizeint); override;
procedure getlocal(list: TAsmList; size: asizeint; alignment: shortint; def: tdef; var ref: treference); override;
procedure gethltemp(list: TAsmList; def: tdef; forcesize: asizeint; temptype: ttemptype; out ref: treference); override;
procedure gethltempmanaged(list: TAsmList; def: tdef; temptype: ttemptype; out ref: treference); override;
end;
implementation
uses
verbose,
cgbase,
symconst,symtable,symdef,symsym,symcpu,defutil,
cpubase,aasmbase,aasmcpu,
hlcgobj,hlcgcpu;
{ ttgjvm }
procedure ttgjvm.getimplicitobjtemp(list: TAsmList; def: tdef; temptype: ttemptype; out ref: treference);
var
sym: tsym;
pd: tprocdef;
begin
gettemp(list,java_jlobject.size,java_jlobject.alignment,temptype,ref);
list.concat(taicpu.op_sym(a_new,current_asmdata.RefAsmSymbol(tabstractrecorddef(def).jvm_full_typename(true),AT_METADATA)));
{ the constructor doesn't return anything, so put a duplicate of the
self pointer on the evaluation stack for use as function result
after the constructor has run }
list.concat(taicpu.op_none(a_dup));
thlcgjvm(hlcg).incstack(list,2);
{ call the constructor }
sym:=tsym(tabstractrecorddef(def).symtable.find('CREATE'));
if assigned(sym) and
(sym.typ=procsym) then
begin
pd:=tprocsym(sym).find_bytype_parameterless(potype_constructor);
if not assigned(pd) then
internalerror(2011032701);
end
else
internalerror(2011060301);
hlcg.a_call_name(list,pd,pd.mangledname,[],nil,false);
thlcgjvm(hlcg).decstack(list,1);
{ store reference to instance }
thlcgjvm(hlcg).a_load_stack_ref(list,java_jlobject,ref,0);
end;
function ttgjvm.getifspecialtemp(list: TAsmList; def: tdef; forcesize: asizeint; temptype: ttemptype; out ref: treference): boolean;
var
eledef: tdef;
ndim: longint;
sym: tsym;
pd: tprocdef;
begin
result:=false;
case def.typ of
arraydef:
begin
if not is_dynamic_array(def) then
begin
{ allocate an array of the right size }
gettemp(list,java_jlobject.size,java_jlobject.alignment,temptype,ref);
ndim:=0;
eledef:=def;
repeat
if forcesize<>-1 then
thlcgjvm(hlcg).a_load_const_stack(list,s32inttype,forcesize div tarraydef(eledef).elesize,R_INTREGISTER)
else
thlcgjvm(hlcg).a_load_const_stack(list,s32inttype,tarraydef(eledef).elecount,R_INTREGISTER);
eledef:=tarraydef(eledef).elementdef;
inc(ndim);
forcesize:=-1;
until (eledef.typ<>arraydef) or
is_dynamic_array(eledef);
eledef:=tarraydef(def).elementdef;
thlcgjvm(hlcg).g_newarray(list,def,ndim);
thlcgjvm(hlcg).a_load_stack_ref(list,java_jlobject,ref,0);
result:=true;
end;
end;
recorddef:
begin
getimplicitobjtemp(list,def,temptype,ref);
result:=true;
end;
setdef:
begin
if tsetdef(def).elementdef.typ=enumdef then
begin
{ load enum class type }
list.concat(taicpu.op_sym(a_ldc,current_asmdata.RefAsmSymbol(tcpuenumdef(tenumdef(tsetdef(def).elementdef).getbasedef).classdef.jvm_full_typename(true),AT_METADATA)));
thlcgjvm(hlcg).incstack(current_asmdata.CurrAsmList,1);
{ call tenumset.noneOf() class method }
sym:=tsym(tobjectdef(java_juenumset).symtable.find('NONEOF'));
if assigned(sym) and
(sym.typ=procsym) then
begin
if tprocsym(sym).procdeflist.Count<>1 then
internalerror(2011062801);
pd:=tprocdef(tprocsym(sym).procdeflist[0]);
hlcg.a_call_name(list,pd,pd.mangledname,[],nil,false);
end;
{ static calls method replaces parameter with set instance
-> no change in stack height }
end
else
begin
list.concat(taicpu.op_sym(a_new,current_asmdata.RefAsmSymbol(java_jubitset.jvm_full_typename(true),AT_METADATA)));
{ the constructor doesn't return anything, so put a duplicate of the
self pointer on the evaluation stack for use as function result
after the constructor has run }
list.concat(taicpu.op_none(a_dup));
thlcgjvm(hlcg).incstack(list,2);
{ call the constructor }
sym:=tsym(java_jubitset.symtable.find('CREATE'));
if assigned(sym) and
(sym.typ=procsym) then
begin
pd:=tprocsym(sym).find_bytype_parameterless(potype_constructor);
if not assigned(pd) then
internalerror(2011062802);
end
else
internalerror(2011062803);
hlcg.a_call_name(list,pd,pd.mangledname,[],nil,false);
{ duplicate self pointer is removed }
thlcgjvm(hlcg).decstack(list,1);
end;
{ store reference to instance }
gettemp(list,java_jlobject.size,java_jlobject.alignment,temptype,ref);
thlcgjvm(hlcg).a_load_stack_ref(list,java_jlobject,ref,0);
result:=true;
end;
procvardef:
begin
if not tprocvardef(def).is_addressonly then
begin
getimplicitobjtemp(list,tcpuprocvardef(def).classdef,temptype,ref);
result:=true;
end;
end;
stringdef:
begin
if is_shortstring(def) then
begin
gettemp(list,java_jlobject.size,java_jlobject.alignment,temptype,ref);
{ add the maxlen parameter (s8inttype because parameters must
be sign extended) }
thlcgjvm(hlcg).a_load_const_stack(list,s8inttype,shortint(tstringdef(def).len),R_INTREGISTER);
{ call the constructor }
sym:=tsym(tobjectdef(java_shortstring).symtable.find('CREATEEMPTY'));
if assigned(sym) and
(sym.typ=procsym) then
begin
if tprocsym(sym).procdeflist.Count<>1 then
internalerror(2011052404);
pd:=tprocdef(tprocsym(sym).procdeflist[0]);
hlcg.a_call_name(list,pd,pd.mangledname,[],nil,false);
end;
{ static calls method replaces parameter with string instance
-> no change in stack height }
{ store reference to instance }
thlcgjvm(hlcg).a_load_stack_ref(list,java_jlobject,ref,0);
result:=true;
end;
end;
filedef:
begin
case tfiledef(def).filetyp of
ft_text:
result:=getifspecialtemp(list,search_system_type('TEXTREC').typedef,forcesize,temptype,ref);
ft_typed,
ft_untyped:
result:=getifspecialtemp(list,search_system_type('FILEREC').typedef,forcesize,temptype,ref);
end;
end;
else
;
end;
end;
procedure ttgjvm.alloctemp(list: TAsmList; size: asizeint; alignment: shortint; temptype: ttemptype; def: tdef; fini: boolean; out ref: treference);
begin
{ the JVM only supports 1 slot (= 4 bytes in FPC) and 2 slot (= 8 bytes in
FPC) temps on the stack. double and int64 are 2 slots, the rest is one slot.
There are no problems with reusing the same slot for a value of a different
type. There are no alignment requirements either. }
if size<4 then
size:=4;
if not(size in [4,8]) then
internalerror(2010121401);
{ don't pass on "def", since we don't care if a slot is used again for a
different type }
inherited alloctemp(list, size shr 2, 1, temptype, nil, false, ref);
end;
procedure ttgjvm.setfirsttemp(l: asizeint);
begin
firsttemp:=l;
lasttemp:=l;
end;
procedure ttgjvm.getlocal(list: TAsmList; size: asizeint; alignment: shortint; def: tdef; var ref: treference);
begin
if not getifspecialtemp(list,def,size,tt_persistent,ref) then
inherited;
end;
procedure ttgjvm.gethltemp(list: TAsmList; def: tdef; forcesize: asizeint; temptype: ttemptype; out ref: treference);
begin
if not getifspecialtemp(list,def,forcesize,temptype,ref) then
inherited;
end;
procedure ttgjvm.gethltempmanaged(list: TAsmList; def: tdef; temptype: ttemptype; out ref: treference);
begin
gethltemp(list,def,def.size,temptype,ref);
end;
begin
tgobjclass:=ttgjvm;
end.
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