mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-04-18 04:19:30 +02:00
530 lines
19 KiB
ObjectPascal
530 lines
19 KiB
ObjectPascal
{
|
|
$Id$
|
|
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
|
|
cpubase,
|
|
globtype,
|
|
symconst,symtype,symdef;
|
|
|
|
type
|
|
{# This class defines some methods to take care of routine
|
|
parameters. It should be overriden for each new processor
|
|
}
|
|
tparamanager = class
|
|
{# Returns true if the return value can be put in accumulator }
|
|
function ret_in_acc(def : tdef;calloption : tproccalloption) : boolean;virtual;
|
|
{# Returns true if the return value is put in a register
|
|
|
|
Either a floating point register, or a general purpose
|
|
register.
|
|
}
|
|
function ret_in_reg(def : tdef;calloption : tproccalloption) : 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(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(def : tdef;calloption : tproccalloption) : boolean;virtual;
|
|
{ return the size of a push }
|
|
function push_size(varspez:tvarspez;def : tdef;calloption : tproccalloption) : longint;
|
|
{ Returns true if a parameter needs to be copied on the stack, this
|
|
is required for cdecl procedures
|
|
}
|
|
function copy_value_on_stack(def : tdef;calloption : tproccalloption) : boolean;
|
|
{# 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.
|
|
|
|
@param(nr Parameter number of routine, starting from 1)
|
|
}
|
|
function getintparaloc(nr : longint) : tparalocation;virtual;abstract;
|
|
{# This is used to populate the location information on all parameters
|
|
for the routine. This is used for normal call resolution.
|
|
}
|
|
procedure create_param_loc_info(p : tabstractprocdef);virtual;abstract;
|
|
|
|
{
|
|
Returns the location where the invisible parameter for structured
|
|
function results will be passed.
|
|
}
|
|
function getfuncretparaloc(p : tabstractprocdef) : tparalocation;virtual;
|
|
|
|
{
|
|
Returns the location where the invisible parameter for nested
|
|
subroutines is passed.
|
|
}
|
|
function getframepointerloc(p : tabstractprocdef) : tparalocation;virtual;
|
|
|
|
{ Returns the self pointer location for the given tabstractprocdef,
|
|
when the stack frame is already created. This is used by the code
|
|
generating the wrappers for implemented interfaces.
|
|
}
|
|
function getselflocation(p : tabstractprocdef) : tparalocation;virtual;abstract;
|
|
|
|
{
|
|
Returns the location of the result if the result is in
|
|
a register, the register(s) return depend on the type of
|
|
the result.
|
|
|
|
@param(def The definition of the result type of the function)
|
|
}
|
|
function getfuncresultloc(def : tdef;calloption:tproccalloption): tparalocation; virtual;
|
|
end;
|
|
|
|
procedure setparalocs(p : tprocdef);
|
|
function getfuncretusedregisters(def : tdef;calloption:tproccalloption): tregisterset;
|
|
|
|
var
|
|
paralocdummy : tparalocation;
|
|
paramanager : tparamanager;
|
|
|
|
implementation
|
|
|
|
uses
|
|
cpuinfo,globals,systems,
|
|
symbase,symsym,
|
|
rgobj,
|
|
defutil,cgbase,cginfo,verbose;
|
|
|
|
{ true if the return value is in accumulator (EAX for i386), D0 for 68k }
|
|
function tparamanager.ret_in_acc(def : tdef;calloption : tproccalloption) : boolean;
|
|
begin
|
|
ret_in_acc:=(def.deftype in [orddef,pointerdef,enumdef,classrefdef]) or
|
|
((def.deftype=stringdef) and (tstringdef(def).string_typ in [st_ansistring,st_widestring])) or
|
|
((def.deftype=procvardef) and not(po_methodpointer in tprocvardef(def).procoptions)) or
|
|
((def.deftype=objectdef) and not is_object(def)) or
|
|
((def.deftype=setdef) and (tsetdef(def).settype=smallset));
|
|
end;
|
|
|
|
function tparamanager.ret_in_reg(def : tdef;calloption : tproccalloption) : boolean;
|
|
begin
|
|
ret_in_reg:=ret_in_acc(def,calloption) or (def.deftype=floatdef);
|
|
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(def : tdef;calloption : tproccalloption) : boolean;
|
|
begin
|
|
push_high_param:=is_open_array(def) or
|
|
is_open_string(def) or
|
|
(is_array_of_const(def) and
|
|
not(calloption in [pocall_cdecl,pocall_cppdecl]));
|
|
end;
|
|
|
|
|
|
{ true if a parameter is too large to copy and only the address is pushed }
|
|
function tparamanager.push_addr_param(def : tdef;calloption : tproccalloption) : boolean;
|
|
begin
|
|
push_addr_param:=false;
|
|
case def.deftype of
|
|
variantdef,
|
|
formaldef :
|
|
push_addr_param:=true;
|
|
recorddef :
|
|
push_addr_param:=not(calloption in [pocall_cdecl,pocall_cppdecl]) and (def.size>pointer_size);
|
|
arraydef :
|
|
push_addr_param:=(
|
|
not(calloption in [pocall_cdecl,pocall_cppdecl]) and
|
|
(tarraydef(def).highrange>=tarraydef(def).lowrange) and
|
|
(def.size>pointer_size)
|
|
) or
|
|
is_open_array(def) or
|
|
{ array of const for cdecl are only pushed values }
|
|
(
|
|
not(calloption in [pocall_cdecl,pocall_cppdecl]) and
|
|
is_array_of_const(def)
|
|
) or
|
|
is_array_constructor(def);
|
|
objectdef :
|
|
push_addr_param:=is_object(def);
|
|
stringdef :
|
|
push_addr_param:=not(calloption in [pocall_cdecl,pocall_cppdecl]) and (tstringdef(def).string_typ in [st_shortstring,st_longstring]);
|
|
procvardef :
|
|
push_addr_param:=not(calloption in [pocall_cdecl,pocall_cppdecl]) and (po_methodpointer in tprocvardef(def).procoptions);
|
|
setdef :
|
|
push_addr_param:=not(calloption in [pocall_cdecl,pocall_cppdecl]) and (tsetdef(def).settype<>smallset);
|
|
end;
|
|
end;
|
|
|
|
|
|
{ true if a parameter is too large to push and needs a concatcopy to get the value on the stack }
|
|
function tparamanager.copy_value_on_stack(def : tdef;calloption : tproccalloption) : boolean;
|
|
begin
|
|
copy_value_on_stack:=false;
|
|
{ this is only for cdecl procedures }
|
|
if not(calloption in [pocall_cdecl,pocall_cppdecl]) then
|
|
exit;
|
|
case def.deftype of
|
|
variantdef,
|
|
formaldef :
|
|
copy_value_on_stack:=true;
|
|
recorddef :
|
|
copy_value_on_stack:=(def.size>pointer_size);
|
|
arraydef :
|
|
copy_value_on_stack:=(tarraydef(def).highrange>=tarraydef(def).lowrange) and
|
|
(def.size>pointer_size);
|
|
objectdef :
|
|
copy_value_on_stack:=is_object(def);
|
|
stringdef :
|
|
copy_value_on_stack:=tstringdef(def).string_typ in [st_shortstring,st_longstring];
|
|
procvardef :
|
|
copy_value_on_stack:=(po_methodpointer in tprocvardef(def).procoptions);
|
|
setdef :
|
|
copy_value_on_stack:=(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:=pointer_size;
|
|
vs_value,
|
|
vs_const :
|
|
begin
|
|
if push_addr_param(def,calloption) then
|
|
push_size:=pointer_size
|
|
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.getfuncretparaloc(p : tabstractprocdef) : tparalocation;
|
|
begin
|
|
result.loc:=LOC_REFERENCE;
|
|
result.size:=OS_ADDR;
|
|
result.sp_fixup:=pointer_size;
|
|
result.reference.index.enum:=stack_pointer_reg;
|
|
result.reference.offset:=0;
|
|
end;
|
|
|
|
|
|
function tparamanager.getframepointerloc(p : tabstractprocdef) : tparalocation;
|
|
begin
|
|
result.loc:=LOC_REFERENCE;
|
|
result.size:=OS_ADDR;
|
|
result.sp_fixup:=pointer_size;
|
|
result.reference.index.enum:=stack_pointer_reg;
|
|
result.reference.offset:=0;
|
|
end;
|
|
|
|
|
|
function tparamanager.getfuncresultloc(def : tdef;calloption:tproccalloption): tparalocation;
|
|
begin
|
|
fillchar(result,sizeof(tparalocation),0);
|
|
if is_void(def) then exit;
|
|
|
|
result.size := def_cgsize(def);
|
|
case def.deftype of
|
|
orddef,
|
|
enumdef :
|
|
begin
|
|
result.loc := LOC_REGISTER;
|
|
{$ifndef cpu64bit}
|
|
if result.size in [OS_64,OS_S64] then
|
|
begin
|
|
result.register64.reghi.enum:=accumulatorhigh;
|
|
result.register64.reglo.enum:=accumulator;
|
|
end
|
|
else
|
|
{$endif cpu64bit}
|
|
result.register.enum:=accumulator;
|
|
end;
|
|
floatdef :
|
|
begin
|
|
result.loc := LOC_FPUREGISTER;
|
|
{$ifdef cpufpemu}
|
|
if cs_fp_emulation in aktmoduleswitches then
|
|
result.register.enum := accumulator
|
|
else
|
|
{$endif cpufpemu}
|
|
result.register.enum := FPU_RESULT_REG;
|
|
end;
|
|
else
|
|
begin
|
|
if ret_in_reg(def,calloption) then
|
|
begin
|
|
result.loc := LOC_REGISTER;
|
|
result.register.enum := accumulator;
|
|
end
|
|
else
|
|
begin
|
|
result.loc := LOC_REFERENCE;
|
|
internalerror(2002081602);
|
|
(*
|
|
{$ifdef EXTDEBUG}
|
|
{ it is impossible to have the
|
|
return value with an index register
|
|
and a symbol!
|
|
}
|
|
if (ref.index <> R_NO) or (assigned(ref.symbol)) then
|
|
internalerror(2002081602);
|
|
{$endif}
|
|
result.reference.index := ref.base;
|
|
result.reference.offset := ref.offset;
|
|
*)
|
|
end;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
function getfuncretusedregisters(def : tdef;calloption:tproccalloption): tregisterset;
|
|
var
|
|
paramloc : tparalocation;
|
|
regset : tregisterset;
|
|
begin
|
|
regset:=[];
|
|
getfuncretusedregisters:=[];
|
|
{ if nothing is returned in registers,
|
|
its useless to continue on in this
|
|
routine
|
|
}
|
|
if not paramanager.ret_in_reg(def,calloption) then
|
|
exit;
|
|
paramloc := paramanager.getfuncresultloc(def,calloption);
|
|
case paramloc.loc of
|
|
LOC_FPUREGISTER,
|
|
LOC_CFPUREGISTER,
|
|
LOC_MMREGISTER,
|
|
LOC_CMMREGISTER,
|
|
LOC_REGISTER,LOC_CREGISTER :
|
|
begin
|
|
regset := regset + [paramloc.register.enum];
|
|
if ((paramloc.size in [OS_S64,OS_64]) and
|
|
(sizeof(aword) < 8))
|
|
then
|
|
begin
|
|
regset := regset + [paramloc.registerhigh.enum];
|
|
end;
|
|
end;
|
|
else
|
|
internalerror(20020816);
|
|
end;
|
|
getfuncretusedregisters:=regset;
|
|
end;
|
|
|
|
procedure setparalocs(p : tprocdef);
|
|
|
|
var
|
|
hp : tparaitem;
|
|
|
|
begin
|
|
hp:=tparaitem(p.para.first);
|
|
while assigned(hp) do
|
|
begin
|
|
if (hp.paraloc.loc in [LOC_REGISTER,LOC_FPUREGISTER,
|
|
LOC_MMREGISTER]) and
|
|
(
|
|
(vo_regable in tvarsym(hp.parasym).varoptions) or
|
|
(vo_fpuregable in tvarsym(hp.parasym).varoptions) or
|
|
paramanager.push_addr_param(hp.paratype.def,p.proccalloption) or
|
|
(hp.paratyp in [vs_var,vs_out])
|
|
) then
|
|
begin
|
|
case hp.paraloc.loc of
|
|
LOC_REGISTER:
|
|
hp.paraloc.loc := LOC_CREGISTER;
|
|
LOC_FPUREGISTER:
|
|
hp.paraloc.loc := LOC_CFPUREGISTER;
|
|
{$ifdef SUPPORT_MMX}
|
|
LOC_MMREGISTER:
|
|
hp.paraloc.loc := LOC_CMMREGISTER;
|
|
{$endif}
|
|
end;
|
|
tvarsym(hp.parasym).paraitem:=hp;
|
|
end;
|
|
hp:=tparaitem(hp.next);
|
|
end;
|
|
end;
|
|
|
|
initialization
|
|
;
|
|
finalization
|
|
paramanager.free;
|
|
end.
|
|
|
|
{
|
|
$Log$
|
|
Revision 1.31 2003-02-02 19:25:54 carl
|
|
* Several bugfixes for m68k target (register alloc., opcode emission)
|
|
+ VIS target
|
|
+ Generic add more complete (still not verified)
|
|
|
|
Revision 1.30 2003/01/08 18:43:56 daniel
|
|
* Tregister changed into a record
|
|
|
|
Revision 1.29 2002/12/23 20:58:03 peter
|
|
* remove unused global var
|
|
|
|
Revision 1.28 2002/12/17 22:19:33 peter
|
|
* fixed pushing of records>8 bytes with stdcall
|
|
* simplified hightree loading
|
|
|
|
Revision 1.27 2002/12/06 16:56:58 peter
|
|
* only compile cs_fp_emulation support when cpufpuemu is defined
|
|
* define cpufpuemu for m68k only
|
|
|
|
Revision 1.26 2002/11/27 20:04:09 peter
|
|
* tvarsym.get_push_size replaced by paramanager.push_size
|
|
|
|
Revision 1.25 2002/11/27 02:33:19 peter
|
|
* copy_value_on_stack method added for cdecl record passing
|
|
|
|
Revision 1.24 2002/11/25 17:43:21 peter
|
|
* splitted defbase in defutil,symutil,defcmp
|
|
* merged isconvertable and is_equal into compare_defs(_ext)
|
|
* made operator search faster by walking the list only once
|
|
|
|
Revision 1.23 2002/11/18 17:31:58 peter
|
|
* pass proccalloption to ret_in_xxx and push_xxx functions
|
|
|
|
Revision 1.22 2002/11/16 18:00:04 peter
|
|
* only push small arrays on the stack for win32
|
|
|
|
Revision 1.21 2002/10/05 12:43:25 carl
|
|
* fixes for Delphi 6 compilation
|
|
(warning : Some features do not work under Delphi)
|
|
|
|
Revision 1.20 2002/09/30 07:07:25 florian
|
|
* fixes to common code to get the alpha compiler compiled applied
|
|
|
|
Revision 1.19 2002/09/30 07:00:47 florian
|
|
* fixes to common code to get the alpha compiler compiled applied
|
|
|
|
Revision 1.18 2002/09/09 09:10:51 florian
|
|
+ added generic tparamanager.getframepointerloc
|
|
|
|
Revision 1.17 2002/09/07 19:40:39 florian
|
|
* tvarsym.paraitem is set now
|
|
|
|
Revision 1.16 2002/09/01 21:04:48 florian
|
|
* several powerpc related stuff fixed
|
|
|
|
Revision 1.15 2002/08/25 19:25:19 peter
|
|
* sym.insert_in_data removed
|
|
* symtable.insertvardata/insertconstdata added
|
|
* removed insert_in_data call from symtable.insert, it needs to be
|
|
called separatly. This allows to deref the address calculation
|
|
* procedures now calculate the parast addresses after the procedure
|
|
directives are parsed. This fixes the cdecl parast problem
|
|
* push_addr_param has an extra argument that specifies if cdecl is used
|
|
or not
|
|
|
|
Revision 1.14 2002/08/17 22:09:47 florian
|
|
* result type handling in tcgcal.pass_2 overhauled
|
|
* better tnode.dowrite
|
|
* some ppc stuff fixed
|
|
|
|
Revision 1.13 2002/08/17 09:23:38 florian
|
|
* first part of procinfo rewrite
|
|
|
|
Revision 1.12 2002/08/16 14:24:58 carl
|
|
* issameref() to test if two references are the same (then emit no opcodes)
|
|
+ ret_in_reg to replace ret_in_acc
|
|
(fix some register allocation bugs at the same time)
|
|
+ save_std_register now has an extra parameter which is the
|
|
usedinproc registers
|
|
|
|
Revision 1.11 2002/08/12 15:08:40 carl
|
|
+ stab register indexes for powerpc (moved from gdb to cpubase)
|
|
+ tprocessor enumeration moved to cpuinfo
|
|
+ linker in target_info is now a class
|
|
* many many updates for m68k (will soon start to compile)
|
|
- removed some ifdef or correct them for correct cpu
|
|
|
|
Revision 1.10 2002/08/10 17:15:20 jonas
|
|
* register parameters are now LOC_CREGISTER instead of LOC_REGISTER
|
|
|
|
Revision 1.9 2002/08/09 07:33:02 florian
|
|
* a couple of interface related fixes
|
|
|
|
Revision 1.8 2002/08/06 20:55:21 florian
|
|
* first part of ppc calling conventions fix
|
|
|
|
Revision 1.7 2002/08/05 18:27:48 carl
|
|
+ more more more documentation
|
|
+ first version include/exclude (can't test though, not enough scratch for i386 :()...
|
|
|
|
Revision 1.6 2002/07/30 20:50:43 florian
|
|
* the code generator knows now if parameters are in registers
|
|
|
|
Revision 1.5 2002/07/26 21:15:39 florian
|
|
* rewrote the system handling
|
|
|
|
Revision 1.4 2002/07/20 11:57:55 florian
|
|
* types.pas renamed to defbase.pas because D6 contains a types
|
|
unit so this would conflicts if D6 programms are compiled
|
|
+ Willamette/SSE2 instructions to assembler added
|
|
|
|
Revision 1.3 2002/07/13 19:38:43 florian
|
|
* some more generic calling stuff fixed
|
|
|
|
Revision 1.2 2002/07/13 07:17:15 jonas
|
|
* fixed memory leak reported by Sergey Korshunoff
|
|
|
|
Revision 1.1 2002/07/11 14:41:28 florian
|
|
* start of the new generic parameter handling
|
|
}
|
|
|
|
|