{
Copyright (c) 2002 by Florian Klaempfl
Generates the argument location information for 680x0
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published bymethodpointer
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.
****************************************************************************
}
{ Generates the argument location information for 680x0.
}
unit cpupara;
{$i fpcdefs.inc}
interface
uses
globtype,
cpubase,
aasmdata,
symconst,symtype,symdef,symsym,
parabase,paramgr,cgbase;
type
{ Returns the location for the nr-st 32 Bit int parameter
if every parameter before is an 32 Bit int parameter as well
and if the calling conventions for the helper routines of the
rtl are used.
}
tm68kparamanager = class(tparamanager)
procedure getintparaloc(calloption : tproccalloption; nr : longint;var cgpara : TCGPara);override;
function create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;override;
function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override;
procedure create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
procedure createtempparaloc(list: TAsmList;calloption : tproccalloption;parasym : tparavarsym;var cgpara:TCGPara);override;
private
procedure init_values(var curintreg, curfloatreg: tsuperregister; var cur_stack_offset: aword);
function create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras: tparalist;
var curintreg, curfloatreg: tsuperregister; var cur_stack_offset: aword):longint;
function parseparaloc(p : tparavarsym;const s : string) : boolean;override;
function parsefuncretloc(p : tabstractprocdef; const s : string) : boolean;override;
end;
implementation
uses
verbose,
globals,
systems,
cpuinfo,cgutils,
defutil;
procedure tm68kparamanager.getintparaloc(calloption : tproccalloption; nr : longint;var cgpara : TCGPara);
var
paraloc : pcgparalocation;
begin
if nr<1 then
internalerror(2002070801);
cgpara.reset;
cgpara.size:=OS_INT;
cgpara.alignment:=std_param_align;
paraloc:=cgpara.add_location;
with paraloc^ do
begin
{ warning : THIS ONLY WORKS WITH INTERNAL ROUTINES,
WHICH MUST ALWAYS PASS 4-BYTE PARAMETERS!!
}
loc:=LOC_REFERENCE;
reference.index:=NR_STACK_POINTER_REG;
reference.offset:=target_info.first_parm_offset+nr*4;
end;
end;
function getparaloc(p : tdef) : tcgloc;
begin
result:=LOC_REFERENCE;
{ 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:
result:=LOC_REGISTER;
floatdef:
result:=LOC_FPUREGISTER;
enumdef:
result:=LOC_REGISTER;
pointerdef:
result:=LOC_REGISTER;
formaldef:
result:=LOC_REGISTER;
classrefdef:
result:=LOC_REGISTER;
recorddef:
if (target_info.abi<>abi_powerpc_aix) then
result:=LOC_REFERENCE
else
result:=LOC_REGISTER;
objectdef:
if is_object(p) then
result:=LOC_REFERENCE
else
result:=LOC_REGISTER;
stringdef:
if is_shortstring(p) or is_longstring(p) then
result:=LOC_REFERENCE
else
result:=LOC_REGISTER;
procvardef:
if (po_methodpointer in tprocvardef(p).procoptions) then
result:=LOC_REFERENCE
else
result:=LOC_REGISTER;
filedef:
result:=LOC_REGISTER;
arraydef:
result:=LOC_REFERENCE;
setdef:
if is_smallset(p) then
result:=LOC_REGISTER
else
result:=LOC_REFERENCE;
variantdef:
result:=LOC_REFERENCE;
{ avoid problems with errornous definitions }
errordef:
result:=LOC_REGISTER;
else
internalerror(2002071001);
end;
}
end;
{$warning copied from ppc cg, needs work}
function tm68kparamanager.push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;
begin
result:=false;
{ var,out always require address }
if varspez in [vs_var,vs_out] then
begin
result:=true;
exit;
end;
case def.typ of
variantdef,
formaldef :
result:=true;
recorddef:
result:=true;
arraydef:
result:=(tarraydef(def).highrange>=tarraydef(def).lowrange) or
is_open_array(def) or
is_array_of_const(def) or
is_array_constructor(def);
objectdef :
result:=is_object(def);
setdef :
result:=(tsetdef(def).settype<>smallset);
stringdef :
result:=tstringdef(def).stringtype in [st_shortstring,st_longstring];
procvardef :
result:=po_methodpointer in tprocvardef(def).procoptions;
end;
end;
procedure tm68kparamanager.init_values(var curintreg, curfloatreg: tsuperregister; var cur_stack_offset: aword);
begin
cur_stack_offset:=8;
curintreg:=RS_D0;
curfloatreg:=RS_FP0;
end;
procedure tm68kparamanager.create_funcretloc_info(p: tabstractprocdef; side: tcallercallee);
var
retcgsize: tcgsize;
begin
{ Constructors return self instead of a boolean }
if (p.proctypeoption=potype_constructor) then
retcgsize:=OS_ADDR
else
retcgsize:=def_cgsize(p.returndef);
location_reset(p.funcretloc[side],LOC_INVALID,OS_NO);
{ explicit paraloc specified? }
if po_explicitparaloc in p.procoptions then
begin
p.funcretloc[side].loc:=LOC_REGISTER;
p.funcretloc[side].register:=p.exp_funcretloc;
p.funcretloc[side].size:=retcgsize;
exit;
end;
{ void has no location }
if is_void(p.returndef) then
begin
location_reset(p.funcretloc[side],LOC_VOID,OS_NO);
exit;
end;
{ Return is passed as var parameter }
if ret_in_param(p.returndef,p.proccalloption) then
begin
p.funcretloc[side].loc:=LOC_REFERENCE;
p.funcretloc[side].size:=retcgsize;
exit;
end;
{ Return in FPU register? }
if not(cs_fp_emulation in current_settings.moduleswitches) and (p.returndef.typ=floatdef) then
begin
p.funcretloc[side].loc:=LOC_FPUREGISTER;
p.funcretloc[side].register:=NR_FPU_RESULT_REG;
p.funcretloc[side].size:=retcgsize;
end
else
{ Return in register }
begin
if retcgsize in [OS_64,OS_S64] then
begin
{ low 32bits }
p.funcretloc[side].loc:=LOC_REGISTER;
p.funcretloc[side].size:=OS_64;
if side=callerside then
p.funcretloc[side].register64.reglo:=NR_FUNCTION_RESULT64_LOW_REG
else
p.funcretloc[side].register64.reglo:=NR_FUNCTION_RETURN64_LOW_REG;
{ high 32bits }
if side=calleeside then
p.funcretloc[side].register64.reghi:=NR_FUNCTION_RESULT64_HIGH_REG
else
p.funcretloc[side].register64.reghi:=NR_FUNCTION_RETURN64_HIGH_REG;
end
else
begin
p.funcretloc[side].loc:=LOC_REGISTER;
p.funcretloc[side].size:=retcgsize;
if side=callerside then
p.funcretloc[side].register:=newreg(R_INTREGISTER,RS_FUNCTION_RESULT_REG,cgsize2subreg(retcgsize))
else
p.funcretloc[side].register:=newreg(R_INTREGISTER,RS_FUNCTION_RETURN_REG,cgsize2subreg(retcgsize));
end;
end;
end;
function tm68kparamanager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;
var
cur_stack_offset: aword;
curintreg, curfloatreg: tsuperregister;
begin
init_values(curintreg,curfloatreg,cur_stack_offset);
result:=create_paraloc_info_intern(p,side,p.paras,curintreg,curfloatreg,cur_stack_offset);
create_funcretloc_info(p,side);
end;
function tm68kparamanager.create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras: tparalist;
var curintreg, curfloatreg: tsuperregister; var cur_stack_offset: aword):longint;
var
paraloc : pcgparalocation;
hp : tparavarsym;
paracgsize : tcgsize;
paralen : aint;
parasize : longint;
paradef : tdef;
i : longint;
loc : tcgloc;
nextintreg,
nextfloatreg : tsuperregister;
stack_offset : longint;
begin
result:=0;
nextintreg:=curintreg;
nextfloatreg:=curfloatreg;
stack_offset:=cur_stack_offset;
parasize:=0;
for i:=0 to p.paras.count-1 do
begin
hp:=tparavarsym(paras[i]);
paradef:=hp.vardef;
{ syscall for AmigaOS can have already a paraloc set }
if (vo_has_explicit_paraloc in hp.varoptions) then
begin
if not(vo_is_syscall_lib in hp.varoptions) then
internalerror(200506051);
continue;
end;
hp.paraloc[side].reset;
{ currently only support C-style array of const }
if (p.proccalloption in [pocall_cdecl,pocall_cppdecl]) and
is_array_of_const(paradef) then
begin
writeln('loc register');
paraloc:=hp.paraloc[side].add_location;
{ hack: the paraloc must be valid, but is not actually used }
paraloc^.loc:=LOC_REGISTER;
paraloc^.register:=NR_D0;
paraloc^.size:=OS_ADDR;
break;
end;
if (hp.varspez in [vs_var,vs_out]) or
push_addr_param(hp.varspez,paradef,p.proccalloption) or
is_open_array(paradef) or
is_array_of_const(paradef) then
begin
writeln('loc register');
paradef:=voidpointertype;
loc:=LOC_REGISTER;
paracgsize := OS_ADDR;
paralen := tcgsize2size[OS_ADDR];
end
else
begin
if not is_special_array(paradef) then
paralen:=paradef.size
else
paralen:=tcgsize2size[def_cgsize(paradef)];
loc:=getparaloc(paradef);
paracgsize:=def_cgsize(paradef);
{ for things like formaldef }
if (paracgsize=OS_NO) then
begin
paracgsize:=OS_ADDR;
paralen := tcgsize2size[OS_ADDR];
end;
end;
hp.paraloc[side].alignment:=std_param_align;
hp.paraloc[side].size:=paracgsize;
hp.paraloc[side].intsize:=paralen;
if (paralen = 0) then
if (paradef.typ = recorddef) then
begin
paraloc:=hp.paraloc[side].add_location;
paraloc^.loc := LOC_VOID;
end
else
internalerror(200506052);
{ can become < 0 for e.g. 3-byte records }
while (paralen > 0) do
begin
paraloc:=hp.paraloc[side].add_location;
{
by default, the m68k doesn't know any register parameters (FK)
if (loc = LOC_REGISTER) and
(nextintreg <= RS_D2) then
begin
//writeln('loc register');
paraloc^.loc := loc;
{ make sure we don't lose whether or not the type is signed }
if (paradef.typ <> orddef) then
paracgsize := int_cgsize(paralen);
if (paracgsize in [OS_NO,OS_64,OS_S64]) then
paraloc^.size := OS_INT
else
paraloc^.size := paracgsize;
paraloc^.register:=newreg(R_INTREGISTER,nextintreg,R_SUBNONE);
inc(nextintreg);
dec(paralen,tcgsize2size[paraloc^.size]);
end
else if (loc = LOC_FPUREGISTER) and
(nextfloatreg <= RS_FP2) then
begin
// writeln('loc fpuregister');
paraloc^.loc:=loc;
paraloc^.size := paracgsize;
paraloc^.register:=newreg(R_FPUREGISTER,nextfloatreg,R_SUBWHOLE);
inc(nextfloatreg);
dec(paralen,tcgsize2size[paraloc^.size]);
end
else { LOC_REFERENCE }
}
begin
writeln('loc reference');
paraloc^.loc:=LOC_REFERENCE;
paraloc^.size:=int_cgsize(paralen);
if (side = callerside) then
paraloc^.reference.index:=NR_STACK_POINTER_REG
else
paraloc^.reference.index:=NR_FRAME_POINTER_REG;
paraloc^.reference.offset:=stack_offset;
inc(stack_offset,align(paralen,4));
paralen := 0;
end;
end;
end;
result:=stack_offset;
// writeln('stack offset:',stack_offset);
end;
{
if push_addr_param(hp.varspez,paradef,p.proccalloption) then
paracgsize:=OS_ADDR
else
begin
paracgsize:=def_cgsize(paradef);
if paracgsize=OS_NO then
paracgsize:=OS_ADDR;
end;
hp.paraloc[side].size:=paracgsize;
hp.paraloc[side].Alignment:=std_param_align;
paraloc:=hp.paraloc[side].add_location;
paraloc^.size:=paracgsize;
paraloc^.loc:=LOC_REFERENCE;
if side=callerside then
paraloc^.reference.index:=NR_STACK_POINTER_REG
else
paraloc^.reference.index:=NR_FRAME_POINTER_REG;
paraloc^.reference.offset:=target_info.first_parm_offset+parasize;
end;
create_funcretloc_info(p,side);
result:=parasize;
end;
}
function tm68kparamanager.parsefuncretloc(p : tabstractprocdef; const s : string) : boolean;
begin
result:=false;
case target_info.system of
system_m68k_amiga:
begin
if s='D0' then
p.exp_funcretloc:=NR_D0
else if s='D1' then
p.exp_funcretloc:=NR_D1
else if s='D2' then
p.exp_funcretloc:=NR_D2
else if s='D3' then
p.exp_funcretloc:=NR_D3
else if s='D4' then
p.exp_funcretloc:=NR_D4
else if s='D5' then
p.exp_funcretloc:=NR_D5
else if s='D6' then
p.exp_funcretloc:=NR_D6
else if s='D7' then
p.exp_funcretloc:=NR_D7
else if s='A0' then
p.exp_funcretloc:=NR_A0
else if s='A1' then
p.exp_funcretloc:=NR_A1
else if s='A2' then
p.exp_funcretloc:=NR_A2
else if s='A3' then
p.exp_funcretloc:=NR_A3
else if s='A4' then
p.exp_funcretloc:=NR_A4
else if s='A5' then
p.exp_funcretloc:=NR_A5
{ 'A6' is problematic, since it's the frame pointer in fpc,
so it should be saved before a call! }
else if s='A6' then
p.exp_funcretloc:=NR_A6
{ 'A7' is the stack pointer on 68k, can't be overwritten by API calls }
else
p.exp_funcretloc:=NR_NO;
if p.exp_funcretloc<>NR_NO then result:=true;
end;
else
internalerror(2005121801);
end;
end;
function tm68kparamanager.parseparaloc(p : tparavarsym;const s : string) : boolean;
var
paraloc : pcgparalocation;
begin
result:=false;
case target_info.system of
system_m68k_amiga:
begin
p.paraloc[callerside].alignment:=4;
paraloc:=p.paraloc[callerside].add_location;
paraloc^.loc:=LOC_REGISTER;
paraloc^.size:=def_cgsize(p.vardef);
{ pattern is always uppercase'd }
if s='D0' then
paraloc^.register:=NR_D0
else if s='D1' then
paraloc^.register:=NR_D1
else if s='D2' then
paraloc^.register:=NR_D2
else if s='D3' then
paraloc^.register:=NR_D3
else if s='D4' then
paraloc^.register:=NR_D4
else if s='D5' then
paraloc^.register:=NR_D5
else if s='D6' then
paraloc^.register:=NR_D6
else if s='D7' then
paraloc^.register:=NR_D7
else if s='A0' then
paraloc^.register:=NR_A0
else if s='A1' then
paraloc^.register:=NR_A1
else if s='A2' then
paraloc^.register:=NR_A2
else if s='A3' then
paraloc^.register:=NR_A3
else if s='A4' then
paraloc^.register:=NR_A4
else if s='A5' then
paraloc^.register:=NR_A5
{ 'A6' is problematic, since it's the frame pointer in fpc,
so it should be saved before a call! }
else if s='A6' then
paraloc^.register:=NR_A6
{ 'A7' is the stack pointer on 68k, can't be overwritten by API calls }
else
exit;
{ copy to callee side }
p.paraloc[calleeside].add_location^:=paraloc^;
end;
else
internalerror(200405092);
end;
result:=true;
end;
procedure tm68kparamanager.createtempparaloc(list: TAsmList;calloption : tproccalloption;parasym : tparavarsym;var cgpara:TCGPara);
var
paraloc : pcgparalocation;
begin
paraloc:=parasym.paraloc[callerside].location;
{ No need for temps when value is pushed }
if not(use_fixed_stack) and
assigned(paraloc) and
(paraloc^.loc=LOC_REFERENCE) and
(paraloc^.reference.index=NR_STACK_POINTER_REG) then
duplicateparaloc(list,calloption,parasym,cgpara)
else
inherited createtempparaloc(list,calloption,parasym,cgpara);
end;
begin
paramanager:=tm68kparamanager.create;
end.
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