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fpc/compiler/i386/cpupara.pas
Jonas Maebe cc5aeb09de * fixed handling the result value of functions where the result type is 
forced to something else by the compiler (internal rtl functions etc),
    necessary for the objc branch
  * fixed adding all used function result registers to the list of
    registers that may need to be saved before a function call

git-svn-id: trunk@13695 -
2009-09-12 12:21:34 +00:00

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{
Copyright (c) 2002 by Florian Klaempfl
Generates the argument location information for i386
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.
****************************************************************************
}
unit cpupara;
{$i fpcdefs.inc}
interface
uses
globtype,
aasmtai,aasmdata,cpubase,cgbase,cgutils,
symconst,symtype,symsym,symdef,
parabase,paramgr;
type
ti386paramanager = class(tparamanager)
function param_use_paraloc(const cgpara:tcgpara):boolean;override;
function ret_in_param(def : tdef;calloption : tproccalloption) : boolean;override;
function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override;
function get_para_align(calloption : tproccalloption):byte;override;
function get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;override;
function get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;override;
function get_volatile_registers_mm(calloption : tproccalloption):tcpuregisterset;override;
{ 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.
}
procedure getintparaloc(calloption : tproccalloption; nr : longint;var cgpara:TCGPara);override;
function create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;override;
function create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint;override;
procedure createtempparaloc(list: TAsmList;calloption : tproccalloption;parasym : tparavarsym;var cgpara:TCGPara);override;
function get_funcretloc(p : tabstractprocdef; side: tcallercallee; def: tdef): tlocation;override;
private
procedure create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
procedure create_stdcall_paraloc_info(p : tabstractprocdef; side: tcallercallee;paras:tparalist;var parasize:longint);
procedure create_register_paraloc_info(p : tabstractprocdef; side: tcallercallee;paras:tparalist;var parareg,parasize:longint);
end;
implementation
uses
cutils,
systems,verbose,
defutil;
const
parasupregs : array[0..2] of tsuperregister = (RS_EAX,RS_EDX,RS_ECX);
{****************************************************************************
TI386PARAMANAGER
****************************************************************************}
function ti386paramanager.param_use_paraloc(const cgpara:tcgpara):boolean;
var
paraloc : pcgparalocation;
begin
if not assigned(cgpara.location) then
internalerror(200410102);
result:=true;
{ All locations are LOC_REFERENCE }
paraloc:=cgpara.location;
while assigned(paraloc) do
begin
if (paraloc^.loc<>LOC_REFERENCE) then
begin
result:=false;
exit;
end;
paraloc:=paraloc^.next;
end;
end;
function ti386paramanager.ret_in_param(def : tdef;calloption : tproccalloption) : boolean;
var
size: longint;
begin
case target_info.system of
system_i386_win32 :
begin
if calloption=pocall_safecall then
begin
result:=true;
exit;
end
else
case def.typ of
recorddef :
begin
{ Win32 GCC returns small records in the FUNCTION_RETURN_REG.
For stdcall we follow delphi instead of GCC }
if (calloption in [pocall_cdecl,pocall_cppdecl]) and
(def.size>0) and
(def.size<=8) then
begin
result:=false;
exit;
end;
end;
end;
end;
system_i386_darwin :
begin
case def.typ of
recorddef :
begin
size := def.size;
if (size > 0) and
(size <= 8) and
{ only if size is a power of 2 }
((size and (size-1)) = 0) then
begin
result := false;
exit;
end;
end;
procvardef:
begin
result:=false;
exit;
end;
end;
end;
end;
result:=inherited ret_in_param(def,calloption);
end;
function ti386paramanager.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.typ of
variantdef :
begin
{ variants are small enough to be passed by value except if
required by the windows api
variants are somethings very delphi/windows specific so do it like
windows/delphi (FK)
}
if ((target_info.system=system_i386_win32) and
(calloption=pocall_stdcall) and
(varspez=vs_const)) or
(calloption=pocall_register) then
result:=true
else
result:=false;
end;
formaldef :
result:=true;
recorddef :
begin
{ Delphi stdcall passes records on the stack for call by value }
if (target_info.system=system_i386_win32) and
(calloption=pocall_stdcall) and
(varspez=vs_value) then
result:=false
else
result:=
(not(calloption in [pocall_cdecl,pocall_cppdecl,pocall_mwpascal]) and
(def.size>sizeof(aint))) or
(((calloption = pocall_mwpascal) or (target_info.system=system_i386_wince)) and
(varspez=vs_const));
end;
arraydef :
begin
{ array of const values are pushed on the stack as
well as dyn. arrays }
if (calloption in [pocall_cdecl,pocall_cppdecl]) then
result:=not(is_array_of_const(def) or
is_dynamic_array(def))
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:= (tstringdef(def).stringtype 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 (not is_smallset(def));
end;
end;
function ti386paramanager.get_para_align(calloption : tproccalloption):byte;
begin
if calloption=pocall_oldfpccall then
begin
if target_info.system in [system_i386_go32v2,system_i386_watcom] then
result:=2
else
result:=4;
end
else
result:=std_param_align;
end;
function ti386paramanager.get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;
begin
case calloption of
pocall_internproc :
result:=[];
pocall_register,
pocall_safecall,
pocall_stdcall,
pocall_cdecl,
pocall_cppdecl,
pocall_mwpascal :
result:=[RS_EAX,RS_EDX,RS_ECX];
pocall_far16,
pocall_pascal,
pocall_oldfpccall :
result:=[RS_EAX,RS_EDX,RS_ECX,RS_ESI,RS_EDI,RS_EBX];
else
internalerror(200309071);
end;
end;
function ti386paramanager.get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;
begin
result:=[0..first_fpu_imreg-1];
end;
function ti386paramanager.get_volatile_registers_mm(calloption : tproccalloption):tcpuregisterset;
begin
result:=[0..first_mm_imreg-1];
end;
procedure ti386paramanager.getintparaloc(calloption : tproccalloption; nr : longint;var cgpara:TCGPara);
var
paraloc : pcgparalocation;
begin
cgpara.reset;
cgpara.size:=OS_ADDR;
cgpara.intsize:=sizeof(pint);
cgpara.alignment:=get_para_align(calloption);
paraloc:=cgpara.add_location;
with paraloc^ do
begin
size:=OS_INT;
if calloption=pocall_register then
begin
if (nr<=high(parasupregs)+1) then
begin
if nr=0 then
internalerror(200309271);
loc:=LOC_REGISTER;
register:=newreg(R_INTREGISTER,parasupregs[nr-1],R_SUBWHOLE);
end
else
begin
loc:=LOC_REFERENCE;
reference.index:=NR_STACK_POINTER_REG;
reference.offset:=sizeof(aint)*nr;
end;
end
else
begin
loc:=LOC_REFERENCE;
reference.index:=NR_STACK_POINTER_REG;
reference.offset:=sizeof(aint)*nr;
end;
end;
end;
procedure ti386paramanager.create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
begin
p.funcretloc[side]:=get_funcretloc(p,side,p.returndef);
end;
function ti386paramanager.get_funcretloc(p : tabstractprocdef; side: tcallercallee; def: tdef): tlocation;
var
retcgsize : tcgsize;
begin
{ Constructors return self instead of a boolean }
if (p.proctypeoption=potype_constructor) then
retcgsize:=OS_ADDR
else
retcgsize:=def_cgsize(def);
location_reset(result,LOC_INVALID,OS_NO);
{ void has no location }
if is_void(def) then
begin
location_reset(result,LOC_VOID,OS_NO);
exit;
end;
{ Return is passed as var parameter }
if ret_in_param(def,p.proccalloption) then
begin
result.loc:=LOC_REFERENCE;
result.size:=retcgsize;
exit;
end;
{ Return in FPU register? }
if def.typ=floatdef then
begin
result.loc:=LOC_FPUREGISTER;
result.register:=NR_FPU_RESULT_REG;
result.size:=retcgsize;
end
else
{ Return in register }
begin
if retcgsize in [OS_64,OS_S64] then
begin
{ low 32bits }
result.loc:=LOC_REGISTER;
result.size:=OS_64;
if side=callerside then
result.register64.reglo:=NR_FUNCTION_RESULT64_LOW_REG
else
result.register64.reglo:=NR_FUNCTION_RETURN64_LOW_REG;
{ high 32bits }
if side=callerside then
result.register64.reghi:=NR_FUNCTION_RESULT64_HIGH_REG
else
result.register64.reghi:=NR_FUNCTION_RETURN64_HIGH_REG;
end
else
begin
result.loc:=LOC_REGISTER;
result.size:=retcgsize;
if side=callerside then
result.register:=newreg(R_INTREGISTER,RS_FUNCTION_RESULT_REG,cgsize2subreg(R_INTREGISTER,retcgsize))
else
result.register:=newreg(R_INTREGISTER,RS_FUNCTION_RETURN_REG,cgsize2subreg(R_INTREGISTER,retcgsize));
end;
end;
end;
procedure ti386paramanager.create_stdcall_paraloc_info(p : tabstractprocdef; side: tcallercallee;paras:tparalist;var parasize:longint);
var
i : integer;
hp : tparavarsym;
paraloc : pcgparalocation;
l,
paralen,
varalign : longint;
paraalign : shortint;
pushaddr : boolean;
paracgsize : tcgsize;
begin
paraalign:=get_para_align(p.proccalloption);
{ we push Flags and CS as long
to cope with the IRETD
and we save 6 register + 4 selectors }
if po_interrupt in p.procoptions then
inc(parasize,8+6*4+4*2);
{ Offset is calculated like:
sub esp,12
mov [esp+8],para3
mov [esp+4],para2
mov [esp],para1
call function
That means for pushes the para with the
highest offset (see para3) needs to be pushed first
}
if p.proccalloption in pushleftright_pocalls then
i:=paras.count-1
else
i:=0;
while ((p.proccalloption in pushleftright_pocalls) and (i>=0)) or
(not(p.proccalloption in pushleftright_pocalls) and (i<=paras.count-1)) do
begin
hp:=tparavarsym(paras[i]);
pushaddr:=push_addr_param(hp.varspez,hp.vardef,p.proccalloption);
if pushaddr then
begin
paralen:=sizeof(aint);
paracgsize:=OS_ADDR;
end
else
begin
paralen:=push_size(hp.varspez,hp.vardef,p.proccalloption);
{ darwin/x86 requires that parameters < sizeof(aint) are sign/ }
{ zero extended to sizeof(aint) }
if (target_info.system = system_i386_darwin) and
(side = callerside) and
(paralen > 0) and
(paralen < sizeof(aint)) then
begin
paralen := sizeof(aint);
paracgsize:=OS_INT;
end
else
paracgsize:=def_cgsize(hp.vardef);
end;
hp.paraloc[side].reset;
hp.paraloc[side].size:=paracgsize;
hp.paraloc[side].intsize:=paralen;
hp.paraloc[side].Alignment:=paraalign;
{ Copy to stack? }
if (paracgsize=OS_NO) or
(use_fixed_stack) then
begin
paraloc:=hp.paraloc[side].add_location;
paraloc^.loc:=LOC_REFERENCE;
paraloc^.size:=paracgsize;
if side=callerside then
paraloc^.reference.index:=NR_STACK_POINTER_REG
else
paraloc^.reference.index:=NR_FRAME_POINTER_REG;
varalign:=used_align(size_2_align(paralen),paraalign,paraalign);
{ don't let push_size return 16, because then we can }
{ read past the end of the heap since the value is only }
{ 10 bytes long (JM) }
if (paracgsize = OS_F80) and
(target_info.system = system_i386_darwin) then
paralen:=16;
paraloc^.reference.offset:=parasize;
if side=calleeside then
inc(paraloc^.reference.offset,target_info.first_parm_offset);
parasize:=align(parasize+paralen,varalign);
end
else
begin
if paralen=0 then
internalerror(200501163);
while (paralen>0) do
begin
paraloc:=hp.paraloc[side].add_location;
paraloc^.loc:=LOC_REFERENCE;
{ single and double need a single location }
if (paracgsize in [OS_F64,OS_F32]) then
begin
paraloc^.size:=paracgsize;
l:=paralen;
end
else
begin
{ We can allocate at maximum 32 bits per location }
if paralen>sizeof(aint) then
l:=sizeof(aint)
else
l:=paralen;
paraloc^.size:=int_cgsize(l);
end;
if (side=callerside) or
(po_nostackframe in p.procoptions) then
paraloc^.reference.index:=NR_STACK_POINTER_REG
else
paraloc^.reference.index:=NR_FRAME_POINTER_REG;
varalign:=used_align(size_2_align(l),paraalign,paraalign);
paraloc^.reference.offset:=parasize;
if side=calleeside then
if not(po_nostackframe in p.procoptions) then
inc(paraloc^.reference.offset,target_info.first_parm_offset)
else
{ return addres }
inc(paraloc^.reference.offset,4);
parasize:=align(parasize+l,varalign);
dec(paralen,l);
end;
end;
if p.proccalloption in pushleftright_pocalls then
dec(i)
else
inc(i);
end;
end;
procedure ti386paramanager.create_register_paraloc_info(p : tabstractprocdef; side: tcallercallee;paras:tparalist;
var parareg,parasize:longint);
var
hp : tparavarsym;
paraloc : pcgparalocation;
paracgsize : tcgsize;
i : integer;
l,
paralen,
varalign : longint;
pushaddr : boolean;
paraalign : shortint;
pass : byte;
begin
if paras.count=0 then
exit;
paraalign:=get_para_align(p.proccalloption);
{ clean up here so we can later detect properly if a parameter has been
assigned or not
}
for i:=0 to paras.count-1 do
tparavarsym(paras[i]).paraloc[side].reset;
{ Register parameters are assigned from left to right,
stack parameters from right to left so assign first the
register parameters in a first pass, in the second
pass all unhandled parameters are done }
for pass:=1 to 2 do
begin
if pass=1 then
i:=0
else
i:=paras.count-1;
while true do
begin
hp:=tparavarsym(paras[i]);
if not(assigned(hp.paraloc[side].location)) then
begin
pushaddr:=push_addr_param(hp.varspez,hp.vardef,p.proccalloption);
if pushaddr then
begin
paralen:=sizeof(aint);
paracgsize:=OS_ADDR;
end
else
begin
paralen:=push_size(hp.varspez,hp.vardef,p.proccalloption);
paracgsize:=def_cgsize(hp.vardef);
end;
hp.paraloc[side].size:=paracgsize;
hp.paraloc[side].intsize:=paralen;
hp.paraloc[side].Alignment:=paraalign;
{
EAX
EDX
ECX
Stack
Stack
64bit values,floats,arrays and records are always
on the stack.
}
if (parareg<=high(parasupregs)) and
(paralen<=sizeof(aint)) and
(
not(hp.vardef.typ in [floatdef,recorddef,arraydef]) or
pushaddr
) then
begin
if pass=1 then
begin
paraloc:=hp.paraloc[side].add_location;
paraloc^.size:=paracgsize;
paraloc^.loc:=LOC_REGISTER;
paraloc^.register:=newreg(R_INTREGISTER,parasupregs[parareg],cgsize2subreg(R_INTREGISTER,paracgsize));
inc(parareg);
end;
end
else
if pass=2 then
begin
{ Copy to stack? }
if (use_fixed_stack) or
(paracgsize=OS_NO) then
begin
paraloc:=hp.paraloc[side].add_location;
paraloc^.loc:=LOC_REFERENCE;
paraloc^.size:=paracgsize;
if side=callerside then
paraloc^.reference.index:=NR_STACK_POINTER_REG
else
paraloc^.reference.index:=NR_FRAME_POINTER_REG;
varalign:=used_align(size_2_align(paralen),paraalign,paraalign);
paraloc^.reference.offset:=parasize;
if side=calleeside then
inc(paraloc^.reference.offset,target_info.first_parm_offset);
parasize:=align(parasize+paralen,varalign);
end
else
begin
if paralen=0 then
internalerror(200501163);
while (paralen>0) do
begin
paraloc:=hp.paraloc[side].add_location;
paraloc^.loc:=LOC_REFERENCE;
{ Extended and double need a single location }
if (paracgsize in [OS_F64,OS_F32]) then
begin
paraloc^.size:=paracgsize;
l:=paralen;
end
else
begin
{ We can allocate at maximum 32 bits per location }
if paralen>sizeof(aint) then
l:=sizeof(aint)
else
l:=paralen;
paraloc^.size:=int_cgsize(l);
end;
if side=callerside then
paraloc^.reference.index:=NR_STACK_POINTER_REG
else
paraloc^.reference.index:=NR_FRAME_POINTER_REG;
varalign:=used_align(size_2_align(l),paraalign,paraalign);
paraloc^.reference.offset:=parasize;
if side=calleeside then
inc(paraloc^.reference.offset,target_info.first_parm_offset);
parasize:=align(parasize+l,varalign);
dec(paralen,l);
end;
end;
end;
end;
case pass of
1:
begin
if i=paras.count-1 then
break;
inc(i);
end;
2:
begin
if i=0 then
break;
dec(i);
end;
end;
end;
end;
end;
function ti386paramanager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;
var
parasize,
parareg : longint;
begin
parasize:=0;
parareg:=0;
case p.proccalloption of
pocall_register :
create_register_paraloc_info(p,side,p.paras,parareg,parasize);
pocall_internproc :
begin
{ Use default calling }
{$warnings off}
if (pocall_default=pocall_register) then
create_register_paraloc_info(p,side,p.paras,parareg,parasize)
else
create_stdcall_paraloc_info(p,side,p.paras,parasize);
{$warnings on}
end;
else
create_stdcall_paraloc_info(p,side,p.paras,parasize);
end;
create_funcretloc_info(p,side);
result:=parasize;
end;
function ti386paramanager.create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint;
var
parasize : longint;
begin
parasize:=0;
{ calculate the registers for the normal parameters }
create_stdcall_paraloc_info(p,callerside,p.paras,parasize);
{ append the varargs }
create_stdcall_paraloc_info(p,callerside,varargspara,parasize);
result:=parasize;
end;
procedure ti386paramanager.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:=ti386paramanager.create;
end.
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