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fpc/compiler/paramgr.pas

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{
$Id$
Copyright (c) 2002 by Florian Klaempfl
Generic calling convention handling
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.
****************************************************************************
}
{# Parameter passing manager. Used to manage how
parameters are passed to routines.
}
unit paramgr;
{$i fpcdefs.inc}
interface
uses
cclasses,globtype,
cpubase,cgbase,
parabase,
aasmtai,
symconst,symtype,symsym,symdef;
type
{# This class defines some methods to take care of routine
parameters. It should be overriden for each new processor
}
tparamanager = class
{ true if the location in paraloc can be reused as localloc }
function param_use_paraloc(const cgpara:tcgpara):boolean;virtual;
{# Returns true if the return value is actually a parameter
pointer.
}
function ret_in_param(def : tdef;calloption : tproccalloption) : boolean;virtual;
function push_high_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;virtual;
{ Returns true if a parameter is too large to copy and only
the address is pushed
}
function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;virtual;
{ return the size of a push }
function push_size(varspez:tvarspez;def : tdef;calloption : tproccalloption) : longint;
{# Returns a structure giving the information on
the storage of the parameter (which must be
an integer parameter). This is only used when calling
internal routines directly, where all parameters must
be 4-byte values.
In case the location is a register, this register is allocated.
Call freeintparaloc() after the call to free the locations again.
Default implementation: don't do anything at all (in case you don't
use register parameter passing)
@param(list Current assembler list)
@param(nr Parameter number of routine, starting from 1)
}
function get_para_align(calloption : tproccalloption):byte;virtual;
function get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;virtual;
function get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;virtual;
function get_volatile_registers_flags(calloption : tproccalloption):tcpuregisterset;virtual;
function get_volatile_registers_mm(calloption : tproccalloption):tcpuregisterset;virtual;
procedure getintparaloc(calloption : tproccalloption; nr : longint;var cgpara:TCGPara);virtual;abstract;
{# allocate a parameter location created with create_paraloc_info
@param(list Current assembler list)
@param(loc Parameter location)
}
procedure allocparaloc(list: taasmoutput; const cgpara: TCGPara); virtual;
{# free a parameter location allocated with alloccgpara
@param(list Current assembler list)
@param(loc Parameter location)
}
procedure freeparaloc(list: taasmoutput; const cgpara: TCGPara); virtual;
{ This is used to populate the location information on all parameters
for the routine as seen in either the caller or the callee. It returns
the size allocated on the stack
}
function create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;virtual;abstract;
{ This is used to populate the location information on all parameters
for the routine when it is being inlined. It returns
the size allocated on the stack
}
function create_inline_paraloc_info(p : tabstractprocdef):longint;virtual;
{ This is used to populate the location information on all parameters
for the routine that are passed as varargs. It returns
the size allocated on the stack (including the normal parameters)
}
function create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint;virtual;abstract;
procedure createtempparaloc(list: taasmoutput;calloption : tproccalloption;parasym : tparavarsym;var cgpara:TCGPara);virtual;
procedure duplicateparaloc(list: taasmoutput;calloption : tproccalloption;parasym : tparavarsym;var cgpara:TCGPara);
function parseparaloc(parasym : tparavarsym;const s : string) : boolean;virtual;abstract;
end;
var
paramanager : tparamanager;
implementation
uses
systems,
cgobj,tgobj,cgutils,
defutil,verbose;
{ true if the location in paraloc can be reused as localloc }
function tparamanager.param_use_paraloc(const cgpara:tcgpara):boolean;
begin
result:=false;
end;
{ true if uses a parameter as return value }
function tparamanager.ret_in_param(def : tdef;calloption : tproccalloption) : boolean;
begin
ret_in_param:=(def.deftype in [arraydef,recorddef]) or
((def.deftype=stringdef) and (tstringdef(def).string_typ in [st_shortstring,st_longstring])) or
((def.deftype=procvardef) and (po_methodpointer in tprocvardef(def).procoptions)) or
((def.deftype=objectdef) and is_object(def)) or
(def.deftype=variantdef) or
((def.deftype=setdef) and (tsetdef(def).settype<>smallset));
end;
function tparamanager.push_high_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;
begin
push_high_param:=not(calloption in [pocall_cdecl,pocall_cppdecl]) and
(
is_open_array(def) or
is_open_string(def) or
is_array_of_const(def)
);
end;
{ true if a parameter is too large to copy and only the address is pushed }
function tparamanager.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;
{ Only vs_const, vs_value here }
case def.deftype of
variantdef,
formaldef :
result:=true;
recorddef :
result:=not(calloption in [pocall_cdecl,pocall_cppdecl]) and (def.size>sizeof(aint));
arraydef :
begin
if (calloption in [pocall_cdecl,pocall_cppdecl]) then
begin
{ array of const values are pushed on the stack }
result:=not is_array_of_const(def);
end
else
begin
result:=(
(tarraydef(def).highrange>=tarraydef(def).lowrange) and
(def.size>sizeof(aint))
) or
is_open_array(def) or
is_array_of_const(def) or
is_array_constructor(def);
end;
end;
objectdef :
result:=is_object(def);
stringdef :
result:=not(calloption in [pocall_cdecl,pocall_cppdecl]) and (tstringdef(def).string_typ in [st_shortstring,st_longstring]);
procvardef :
result:=not(calloption in [pocall_cdecl,pocall_cppdecl]) and (po_methodpointer in tprocvardef(def).procoptions);
setdef :
result:=not(calloption in [pocall_cdecl,pocall_cppdecl]) and (tsetdef(def).settype<>smallset);
end;
end;
{ return the size of a push }
function tparamanager.push_size(varspez:tvarspez;def : tdef;calloption : tproccalloption) : longint;
begin
push_size:=-1;
case varspez of
vs_out,
vs_var :
push_size:=sizeof(aint);
vs_value,
vs_const :
begin
if push_addr_param(varspez,def,calloption) then
push_size:=sizeof(aint)
else
begin
{ special array are normally pushed by addr, only for
cdecl array of const it comes here and the pushsize
is unknown }
if is_array_of_const(def) then
push_size:=0
else
push_size:=def.size;
end;
end;
end;
end;
function tparamanager.get_para_align(calloption : tproccalloption):byte;
begin
result:=std_param_align;
end;
function tparamanager.get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;
begin
result:=[];
end;
function tparamanager.get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;
begin
result:=[];
end;
function tparamanager.get_volatile_registers_flags(calloption : tproccalloption):tcpuregisterset;
begin
result:=[];
end;
function tparamanager.get_volatile_registers_mm(calloption : tproccalloption):tcpuregisterset;
begin
result:=[];
end;
procedure tparamanager.allocparaloc(list: taasmoutput; const cgpara: TCGPara);
var
paraloc : pcgparalocation;
begin
paraloc:=cgpara.location;
while assigned(paraloc) do
begin
case paraloc^.loc of
LOC_REGISTER,
LOC_CREGISTER:
begin
if getsupreg(paraloc^.register)<first_int_imreg then
cg.getcpuregister(list,paraloc^.register);
end;
LOC_FPUREGISTER,
LOC_CFPUREGISTER:
begin
if getsupreg(paraloc^.register)<first_fpu_imreg then
cg.getcpuregister(list,paraloc^.register);
end;
LOC_MMREGISTER,
LOC_CMMREGISTER :
begin
if getsupreg(paraloc^.register)<first_mm_imreg then
cg.getcpuregister(list,paraloc^.register);
end;
end;
paraloc:=paraloc^.next;
end;
end;
procedure tparamanager.freeparaloc(list: taasmoutput; const cgpara: TCGPara);
var
paraloc : Pcgparalocation;
{$ifdef cputargethasfixedstack}
href : treference;
{$endif cputargethasfixedstack}
begin
paraloc:=cgpara.location;
while assigned(paraloc) do
begin
case paraloc^.loc of
LOC_VOID:
;
LOC_REGISTER,
LOC_CREGISTER:
begin
if getsupreg(paraloc^.register)<first_int_imreg then
cg.ungetcpuregister(list,paraloc^.register);
end;
LOC_FPUREGISTER,
LOC_CFPUREGISTER:
begin
if getsupreg(paraloc^.register)<first_fpu_imreg then
cg.ungetcpuregister(list,paraloc^.register);
end;
LOC_MMREGISTER,
LOC_CMMREGISTER :
begin
if getsupreg(paraloc^.register)<first_mm_imreg then
cg.ungetcpuregister(list,paraloc^.register);
end;
LOC_REFERENCE,
LOC_CREFERENCE :
begin
{$ifdef cputargethasfixedstack}
{ don't use reference_reset_base, because that will depend on cgobj }
fillchar(href,sizeof(href),0);
href.base:=paraloc^.reference.index;
href.offset:=paraloc^.reference.offset;
tg.ungettemp(list,href);
{$endif cputargethasfixedstack}
end;
else
internalerror(2004110212);
end;
paraloc:=paraloc^.next;
end;
end;
procedure tparamanager.createtempparaloc(list: taasmoutput;calloption : tproccalloption;parasym : tparavarsym;var cgpara:TCGPara);
var
href : treference;
len : aint;
paraloc,
newparaloc : pcgparalocation;
begin
cgpara.reset;
cgpara.size:=parasym.paraloc[callerside].size;
cgpara.intsize:=parasym.paraloc[callerside].intsize;
cgpara.alignment:=parasym.paraloc[callerside].alignment;
{$ifdef powerpc}
cgpara.composite:=parasym.paraloc[callerside].composite;
{$endif powerpc}
paraloc:=parasym.paraloc[callerside].location;
while assigned(paraloc) do
begin
if paraloc^.size=OS_NO then
len:=push_size(parasym.varspez,parasym.vartype.def,calloption)
else
len:=tcgsize2size[paraloc^.size];
newparaloc:=cgpara.add_location;
newparaloc^.size:=paraloc^.size;
{$warning maybe release this optimization for all targets?}
{$ifdef sparc}
{ Does it fit a register? }
if len<=sizeof(aint) then
newparaloc^.loc:=LOC_REGISTER
else
{$endif sparc}
newparaloc^.loc:=paraloc^.loc;
case newparaloc^.loc of
LOC_REGISTER :
newparaloc^.register:=cg.getintregister(list,paraloc^.size);
LOC_FPUREGISTER :
newparaloc^.register:=cg.getfpuregister(list,paraloc^.size);
LOC_MMREGISTER :
newparaloc^.register:=cg.getmmregister(list,paraloc^.size);
LOC_REFERENCE :
begin
tg.gettemp(list,len,tt_persistent,href);
newparaloc^.reference.index:=href.base;
newparaloc^.reference.offset:=href.offset;
end;
end;
paraloc:=paraloc^.next;
end;
end;
procedure tparamanager.duplicateparaloc(list: taasmoutput;calloption : tproccalloption;parasym : tparavarsym;var cgpara:TCGPara);
var
paraloc,
newparaloc : pcgparalocation;
begin
cgpara.reset;
cgpara.size:=parasym.paraloc[callerside].size;
cgpara.intsize:=parasym.paraloc[callerside].intsize;
cgpara.alignment:=parasym.paraloc[callerside].alignment;
{$ifdef powerpc}
cgpara.composite:=parasym.paraloc[callerside].composite;
{$endif powerpc}
paraloc:=parasym.paraloc[callerside].location;
while assigned(paraloc) do
begin
newparaloc:=cgpara.add_location;
move(paraloc^,newparaloc^,sizeof(newparaloc^));
newparaloc^.next:=nil;
paraloc:=paraloc^.next;
end;
end;
function tparamanager.create_inline_paraloc_info(p : tabstractprocdef):longint;
begin
{ We need to return the size allocated }
create_paraloc_info(p,callerside);
result:=create_paraloc_info(p,calleeside);
end;
initialization
;
finalization
paramanager.free;
end.
{
$Log$
Revision 1.85 2005-01-20 17:47:01 peter
* remove copy_value_on_stack and a_param_copy_ref
Revision 1.84 2005/01/18 22:19:20 peter
* multiple location support for i386 a_param_ref
* remove a_param_copy_ref for i386
Revision 1.83 2005/01/10 21:50:05 jonas
+ support for passing records in registers under darwin
* tcgpara now also has an intsize field, which contains the size in
bytes of the whole parameter
Revision 1.82 2004/11/21 17:17:03 florian
* changed funcret location back to tlocation
Revision 1.81 2004/11/15 23:35:31 peter
* tparaitem removed, use tparavarsym instead
* parameter order is now calculated from paranr value in tparavarsym
Revision 1.80 2004/10/31 21:45:03 peter
* generic tlocation
* move tlocation to cgutils
Revision 1.79 2004/09/25 14:23:54 peter
* ungetregister is now only used for cpuregisters, renamed to
ungetcpuregister
* renamed (get|unget)explicitregister(s) to ..cpuregister
* removed location-release/reference_release
Revision 1.78 2004/09/21 17:25:12 peter
* paraloc branch merged
Revision 1.77.4.1 2004/08/31 20:43:06 peter
* paraloc patch
Revision 1.77 2004/07/09 23:41:04 jonas
* support register parameters for inlined procedures + some inline
cleanups
Revision 1.76 2004/06/20 08:55:30 florian
* logs truncated
Revision 1.75 2004/06/16 20:07:09 florian
* dwarf branch merged
Revision 1.74 2004/04/18 15:22:24 florian
+ location support for arguments, currently PowerPC/MorphOS only
Revision 1.73.2.5 2004/05/03 20:18:52 peter
* fixes for tprintf
Revision 1.73.2.4 2004/05/02 20:20:59 florian
* started to fix callee side result value handling
Revision 1.73.2.3 2004/05/02 12:45:32 peter
* enabled cpuhasfixedstack for x86-64 again
* fixed size of temp allocation for parameters
}
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