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{
Copyright (c) 1998-2002 by Florian Klaempfl
Calling conventions for the SPARC
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.
*****************************************************************************}
unit cpupara;
{$i fpcdefs.inc}
interface
uses
globtype,
cclasses,
aasmtai,aasmdata,
cpubase,cpuinfo,
sppara,
symconst,symbase,symsym,symtype,symdef,paramgr,parabase,cgbase,cgutils;
type
tcpuparamanager=class(TSparcParaManager)
procedure create_paraloc_info_intern(p : tabstractprocdef; side : tcallercallee; paras : tparalist;
var curintreg: LongInt; curfloatreg: tsuperregister; var cur_stack_offset: aword);override;
function push_addr_param(varspez : tvarspez; def : tdef; calloption : tproccalloption) : boolean;override;
function get_funcretloc(p : tabstractprocdef; side: tcallercallee; forcetempdef: tdef): tcgpara;override;
end;
implementation
uses
cutils,verbose,systems,
defutil,
cgobj;
{ true if a parameter is too large to copy and only the address is pushed }
function tcpuparamanager.push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;
begin
result:=false;
{ var,out,constref always require address }
if varspez in [vs_var,vs_out,vs_constref] then
begin
result:=true;
exit;
end;
case def.typ of
arraydef:
result:=(tarraydef(def).highrange>=tarraydef(def).lowrange) or
is_open_array(def) or
is_array_of_const(def) or
is_array_constructor(def);
recorddef,
variantdef,
formaldef :
result:=true;
objectdef :
result:=is_object(def);
stringdef :
result:=(tstringdef(def).stringtype in [st_shortstring,st_longstring]);
procvardef :
result:=not tprocvardef(def).is_addressonly;
setdef :
result:=not is_smallset(def);
end;
end;
procedure tcpuparamanager.create_paraloc_info_intern(p : tabstractprocdef; side : tcallercallee; paras : tparalist;
var curintreg : LongInt; curfloatreg : tsuperregister;
var cur_stack_offset : aword);
var
paraloc : pcgparalocation;
i : integer;
hp : tparavarsym;
paradef : tdef;
paracgsize : tcgsize;
hparasupregs : pparasupregs;
paralen : longint;
begin
if side=callerside then
hparasupregs:=@paraoutsupregs
else
hparasupregs:=@parainsupregs;
for i:=0 to paras.count-1 do
begin
hp:=tparavarsym(paras[i]);
paradef:=hp.vardef;
{ currently only support C-style array of const,
there should be no location assigned to the vararg array itself }
if (p.proccalloption in cstylearrayofconst) and
is_array_of_const(paradef) then
begin
paraloc:=hp.paraloc[side].add_location;
{ hack: the paraloc must be valid, but is not actually used }
paraloc^.loc:=LOC_REGISTER;
paraloc^.register:=NR_G0;
paraloc^.size:=OS_ADDR;
paraloc^.def:=voidpointertype;
break;
end;
if push_addr_param(hp.varspez,paradef,p.proccalloption) then
begin
paracgsize:=OS_ADDR;
paradef:=cpointerdef.getreusable_no_free(paradef);
end
else
begin
paracgsize:=def_cgsize(paradef);
{ for formaldef }
if paracgsize=OS_NO then
begin
paracgsize:=OS_ADDR;
paradef:=voidpointertype;
end;
end;
hp.paraloc[side].reset;
hp.paraloc[side].size:=paracgsize;
hp.paraloc[side].def:=paradef;
if (side = callerside) then
hp.paraloc[side].Alignment:=std_param_align
else
hp.paraloc[side].Alignment:=paradef.alignment;
paralen:=tcgsize2size[paracgsize];
hp.paraloc[side].intsize:=paralen;
while paralen>0 do
begin
paraloc:=hp.paraloc[side].add_location;
{ Floats are passed in int registers,
We can allocate at maximum 32 bits per register }
if paracgsize in [OS_64,OS_S64,OS_F32,OS_F64] then
begin
paraloc^.size:=OS_32;
paraloc^.def:=u32inttype;
end
else
begin
paraloc^.size:=paracgsize;
paraloc^.def:=paradef;
end;
{ ret in param? }
if vo_is_funcret in hp.varoptions then
begin
paraloc^.loc:=LOC_REFERENCE;
paraloc^.reference.offset:=64;
if side=callerside then
paraloc^.reference.index:=NR_STACK_POINTER_REG
else
paraloc^.reference.index:=NR_FRAME_POINTER_REG;
end
{ In case of po_delphi_nested_cc, the parent frame pointer
is always passed on the stack. }
else if (curintreg<=high(tparasupregs)) and
(not(vo_is_parentfp in hp.varoptions) or
not(po_delphi_nested_cc in p.procoptions)) then
begin
paraloc^.loc:=LOC_REGISTER;
paraloc^.register:=newreg(R_INTREGISTER,hparasupregs^[curintreg],R_SUBWHOLE);
inc(curintreg);
end
else
begin
paraloc^.loc:=LOC_REFERENCE;
paraloc^.reference.offset:=target_info.first_parm_offset+cur_stack_offset;
if side=callerside then
paraloc^.reference.index:=NR_STACK_POINTER_REG
else
paraloc^.reference.index:=NR_FRAME_POINTER_REG;
if (target_info.endian=endian_big) and
(paralen<tcgsize2size[OS_INT]) and
(paradef.typ<>recorddef) then
inc(paraloc^.reference.offset,4-paralen);
{ Parameters are aligned at 4 bytes }
inc(cur_stack_offset,align(tcgsize2size[paraloc^.size],sizeof(pint)));
end;
dec(paralen,tcgsize2size[paraloc^.size]);
end;
end;
end;
function tcpuparamanager.get_funcretloc(p : tabstractprocdef; side: tcallercallee; forcetempdef: tdef): tcgpara;
var
paraloc : pcgparalocation;
retcgsize : tcgsize;
begin
if set_common_funcretloc_info(p,forcetempdef,retcgsize,result) then
exit;
paraloc:=result.add_location;
{ Return in FPU register? }
if result.def.typ=floatdef then
begin
paraloc^.loc:=LOC_FPUREGISTER;
paraloc^.register:=NR_FPU_RESULT_REG;
if retcgsize=OS_F64 then
setsubreg(paraloc^.register,R_SUBFD);
paraloc^.size:=retcgsize;
paraloc^.def:=result.def;
end
else
{ Return in register }
begin
if retcgsize in [OS_64,OS_S64] then
begin
paraloc^.loc:=LOC_REGISTER;
{ high }
if side=callerside then
paraloc^.register:=NR_FUNCTION_RESULT64_HIGH_REG
else
paraloc^.register:=NR_FUNCTION_RETURN64_HIGH_REG;
paraloc^.size:=OS_32;
paraloc^.def:=u32inttype;
{ low }
paraloc:=result.add_location;
paraloc^.loc:=LOC_REGISTER;
if side=callerside then
paraloc^.register:=NR_FUNCTION_RESULT64_LOW_REG
else
paraloc^.register:=NR_FUNCTION_RETURN64_LOW_REG;
paraloc^.size:=OS_32;
paraloc^.def:=u32inttype;
end
else
begin
paraloc^.loc:=LOC_REGISTER;
paraloc^.size:=retcgsize;
paraloc^.def:=result.def;
if (side=callerside) then
paraloc^.register:=newreg(R_INTREGISTER,RS_FUNCTION_RESULT_REG,cgsize2subreg(R_INTREGISTER,retcgsize))
else
paraloc^.register:=newreg(R_INTREGISTER,RS_FUNCTION_RETURN_REG,cgsize2subreg(R_INTREGISTER,retcgsize));
end;
end;
end;
begin
ParaManager:=tcpuparamanager.create;
end.
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