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291 lines
10 KiB
ObjectPascal
291 lines
10 KiB
ObjectPascal
{
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Copyright (c) 2002 by Florian Klaempfl
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Alpha specific calling conventions
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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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{ Alpha specific calling conventions are handled by this unit
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}
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unit cpupara;
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{$i fpcdefs.inc}
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interface
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uses
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cpubase,
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symconst,symbase,symtype,symdef,paramgr;
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type
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talphaparamanager = class(tparamanager)
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function getintparaloc(nr : longint) : tparalocation;override;
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procedure create_param_loc_info(p : tabstractprocdef);override;
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function getfuncretparaloc(p : tabstractprocdef) : tparalocation;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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globtype,
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cpuinfo,cginfo,cgbase,
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defbase;
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function talphaparamanager.getintparaloc(nr : longint) : tparalocation;
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begin
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fillchar(result,sizeof(tparalocation),0);
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if nr<1 then
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internalerror(2002070801)
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else if nr<=8 then
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begin
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result.loc:=LOC_REGISTER;
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result.register:=tregister(longint(R_2)+nr);
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end
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else
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begin
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result.loc:=LOC_REFERENCE;
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result.reference.index:=stack_pointer_reg;
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result.reference.offset:=(nr-8)*4;
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end;
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end;
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function getparaloc(p : tdef) : tloc;
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begin
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{ Later, the LOC_REFERENCE is in most cases changed into LOC_REGISTER
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if push_addr_param for the def is true
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}
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case p.deftype of
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orddef:
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getparaloc:=LOC_REGISTER;
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floatdef:
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getparaloc:=LOC_FPUREGISTER;
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enumdef:
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getparaloc:=LOC_REGISTER;
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pointerdef:
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getparaloc:=LOC_REGISTER;
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formaldef:
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getparaloc:=LOC_REGISTER;
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classrefdef:
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getparaloc:=LOC_REGISTER;
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recorddef:
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getparaloc:=LOC_REFERENCE;
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objectdef:
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if is_object(p) then
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getparaloc:=LOC_REFERENCE
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else
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getparaloc:=LOC_REGISTER;
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stringdef:
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if is_shortstring(p) or is_longstring(p) then
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getparaloc:=LOC_REFERENCE
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else
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getparaloc:=LOC_REGISTER;
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procvardef:
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if (po_methodpointer in tprocvardef(p).procoptions) then
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getparaloc:=LOC_REFERENCE
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else
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getparaloc:=LOC_REGISTER;
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filedef:
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getparaloc:=LOC_REGISTER;
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arraydef:
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getparaloc:=LOC_REFERENCE;
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setdef:
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if is_smallset(p) then
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getparaloc:=LOC_REGISTER
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else
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getparaloc:=LOC_REFERENCE;
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variantdef:
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getparaloc:=LOC_REFERENCE;
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{ avoid problems with errornous definitions }
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errordef:
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getparaloc:=LOC_REGISTER;
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else
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internalerror(2002071001);
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end;
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end;
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procedure talphaparamanager.create_param_loc_info(p : tabstractprocdef);
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var
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nextintreg,nextfloatreg,nextmmreg : tregister;
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stack_offset : aword;
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hp : tparaitem;
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loc : tloc;
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is_64bit: boolean;
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begin
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nextintreg:=R_3;
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nextfloatreg:=R_F1;
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// nextmmreg:=R_M1;
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stack_offset:=0;
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{ pointer for structured results ? }
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if not is_void(p.rettype.def) then
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begin
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if not(ret_in_reg(p.rettype.def)) then
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inc(nextintreg);
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end;
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{ frame pointer for nested procedures? }
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{ inc(nextintreg); }
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{ constructor? }
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{ destructor? }
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hp:=tparaitem(p.para.last);
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while assigned(hp) do
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begin
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loc:=getparaloc(hp.paratype.def);
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hp.paraloc.sp_fixup:=0;
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case loc of
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LOC_REGISTER:
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begin
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hp.paraloc.size := def_cgsize(hp.paratype.def);
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{ for things like formaldef }
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if hp.paraloc.size = OS_NO then
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hp.paraloc.size := OS_ADDR;
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is_64bit := hp.paraloc.size in [OS_64,OS_S64];
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if nextintreg<=tregister(ord(R_10)-ord(is_64bit)) then
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begin
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hp.paraloc.loc:=LOC_REGISTER;
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hp.paraloc.register64.reglo:=nextintreg;
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inc(nextintreg);
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if is_64bit then
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begin
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hp.paraloc.register64.reghi:=nextintreg;
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inc(nextintreg);
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end;
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end
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else
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begin
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nextintreg := R_11;
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hp.paraloc.loc:=LOC_REFERENCE;
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hp.paraloc.reference.index:=stack_pointer_reg;
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hp.paraloc.reference.offset:=stack_offset;
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if not is_64bit then
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inc(stack_offset,4)
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else
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inc(stack_offset,8);
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end;
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end;
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LOC_FPUREGISTER:
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begin
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if hp.paratyp in [vs_var,vs_out] then
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begin
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if nextintreg<=R_10 then
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begin
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hp.paraloc.size:=OS_ADDR;
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hp.paraloc.loc:=LOC_REGISTER;
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hp.paraloc.register:=nextintreg;
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inc(nextintreg);
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end
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else
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begin
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{!!!!!!!}
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hp.paraloc.size:=def_cgsize(hp.paratype.def);
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internalerror(2002071006);
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end;
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end
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else if nextfloatreg<=R_F10 then
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begin
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hp.paraloc.size:=def_cgsize(hp.paratype.def);
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hp.paraloc.loc:=LOC_FPUREGISTER;
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hp.paraloc.register:=nextfloatreg;
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inc(nextfloatreg);
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end
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else
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begin
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{!!!!!!!}
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hp.paraloc.size:=def_cgsize(hp.paratype.def);
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internalerror(2002071004);
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end;
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end;
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LOC_REFERENCE:
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begin
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hp.paraloc.size:=OS_ADDR;
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if push_addr_param(hp.paratype.def,p.proccalloption in [pocall_cdecl,pocall_cppdecl]) or (hp.paratyp in [vs_var,vs_out]) then
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begin
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if nextintreg<=R_10 then
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begin
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hp.paraloc.loc:=LOC_REGISTER;
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hp.paraloc.register:=nextintreg;
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inc(nextintreg);
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end
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else
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begin
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hp.paraloc.loc:=LOC_REFERENCE;
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hp.paraloc.reference.index:=stack_pointer_reg;
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hp.paraloc.reference.offset:=stack_offset;
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inc(stack_offset,4);
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end;
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end
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else
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begin
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hp.paraloc.loc:=LOC_REFERENCE;
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hp.paraloc.reference.index:=stack_pointer_reg;
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hp.paraloc.reference.offset:=stack_offset;
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inc(stack_offset,hp.paratype.def.size);
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end;
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end;
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else
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internalerror(2002071002);
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end;
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hp:=tparaitem(hp.previous);
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end;
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end;
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function talphaparamanager.getfuncretparaloc(p : tabstractprocdef) : tparalocation;
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begin
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case p.rettype.def.deftype of
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orddef,
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enumdef:
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begin
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getfuncretparaloc.loc:=LOC_REGISTER;
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getfuncretparaloc.register:=R_3;
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getfuncretparaloc.size:=def_cgsize(p.rettype.def);
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if getfuncretparaloc.size in [OS_S64,OS_64] then
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getfuncretparaloc.register64.reghi:=R_4;
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end;
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floatdef:
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begin
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getfuncretparaloc.loc:=LOC_FPUREGISTER;
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getfuncretparaloc.register:=R_F1;
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getfuncretparaloc.size:=def_cgsize(p.rettype.def);
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end;
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pointerdef,
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formaldef,
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classrefdef,
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recorddef,
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objectdef,
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stringdef,
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procvardef,
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filedef,
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arraydef,
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errordef:
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begin
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getfuncretparaloc.loc:=LOC_REGISTER;
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getfuncretparaloc.register:=R_3;
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getfuncretparaloc.size:=OS_ADDR;
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end;
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else
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internalerror(2002090903);
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end;
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end;
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begin
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paramanager:=talphaparamanager.create;
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end.
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