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