{
Copyright (c) 2002 by Florian Klaempfl
Generates the argument location information for x86-64 target
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;
{$i fpcdefs.inc}
interface
uses
globtype,
cpubase,cgbase,
symconst,symtype,symsym,symdef,
aasmtai,aasmdata,
parabase,paramgr;
type
tx86_64paramanager = class(tparamanager)
private
procedure create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
procedure create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee;paras:tparalist;
var intparareg,mmparareg,parasize:longint;varargsparas: boolean);
public
function param_use_paraloc(const cgpara:tcgpara):boolean;override;
function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override;
function ret_in_param(def : tdef;calloption : tproccalloption) : boolean;override;
procedure getintparaloc(calloption : tproccalloption; nr : longint;var cgpara:TCGPara);override;
function get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;override;
function get_volatile_registers_mm(calloption : tproccalloption):tcpuregisterset;override;
function get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;override;
function create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;override;
function create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint;override;
end;
implementation
uses
cutils,verbose,
systems,
defutil,
cgutils;
const
paraintsupregs : array[0..5] of tsuperregister = (RS_RDI,RS_RSI,RS_RDX,RS_RCX,RS_R8,RS_R9);
parammsupregs : array[0..7] of tsuperregister = (RS_XMM0,RS_XMM1,RS_XMM2,RS_XMM3,RS_XMM4,RS_XMM5,RS_XMM6,RS_XMM7);
paraintsupregs_winx64 : array[0..3] of tsuperregister = (RS_RCX,RS_RDX,RS_R8,RS_R9);
parammsupregs_winx64 : array[0..3] of tsuperregister = (RS_XMM0,RS_XMM1,RS_XMM2,RS_XMM3);
function structure_in_registers(varspez:tvarspez;size:longint):boolean;
begin
if (target_info.system=system_x86_64_win64) then
{$warning Temporary hack: vs_const parameters are always passed by reference for win64}
result:=(varspez=vs_value) and (size in [1,2,4,8])
else
result:=(size<=16);
end;
procedure getvalueparaloc(varspez:tvarspez;p : tdef;var loc1,loc2:tcgloc);
begin
loc1:=LOC_INVALID;
loc2:=LOC_INVALID;
case p.typ of
orddef:
begin
loc1:=LOC_REGISTER;
{$warning TODO 128bit also needs lochigh}
end;
floatdef:
begin
case tfloatdef(p).floattype of
s80real:
loc1:=LOC_REFERENCE;
s32real,
s64real :
loc1:=LOC_MMREGISTER;
s64currency,
s64comp :
loc1:=LOC_REGISTER;
s128real:
begin
loc1:=LOC_MMREGISTER;
loc2:=LOC_MMREGISTER;
{$warning TODO float 128bit needs SSEUP lochigh}
end;
end;
end;
recorddef:
begin
if structure_in_registers(varspez,p.size) then
begin
loc1:=LOC_REGISTER;
if p.size>8 then
loc2:=LOC_REGISTER;
end
else
loc1:=LOC_REFERENCE;
end;
objectdef:
begin
if is_object(p) then
begin
if structure_in_registers(varspez,p.size) then
loc1:=LOC_REGISTER
else
loc1:=LOC_REFERENCE;
end
else
loc1:=LOC_REGISTER;
end;
arraydef:
begin
if not(is_special_array(p)) and
(target_info.system=system_x86_64_win64) and
structure_in_registers(varspez,p.size) then
begin
loc1:=LOC_REGISTER;
if p.size>8 then
loc2:=LOC_REGISTER;
end
else
loc1:=LOC_REFERENCE;
end;
variantdef:
{ linux abi }
if target_info.system<>system_x86_64_win64 then
loc1:=LOC_REGISTER
else
loc1:=LOC_REFERENCE;
stringdef:
if is_shortstring(p) or is_longstring(p) then
begin
{ handle long and shortstrings like arrays }
if structure_in_registers(varspez,p.size) then
begin
loc1:=LOC_REGISTER;
if p.size>8 then
loc2:=LOC_REGISTER;
end
else
loc1:=LOC_REFERENCE;
end
else
loc1:=LOC_REGISTER;
setdef:
if is_smallset(p) then
loc1:=LOC_REGISTER
else
loc1:=LOC_REFERENCE;
procvardef:
begin
if (po_methodpointer in tprocvardef(p).procoptions) then
begin
{ This is a record of 16 bytes }
if structure_in_registers(varspez,p.size) then
begin
loc1:=LOC_REGISTER;
loc2:=LOC_REGISTER;
end
else
loc1:=LOC_REFERENCE;
end
else
loc1:=LOC_REGISTER;
end;
else
begin
{ default for pointers,enums,etc }
loc1:=LOC_REGISTER;
end;
end;
end;
function tx86_64paramanager.ret_in_param(def : tdef;calloption : tproccalloption) : boolean;
begin
if target_info.system=system_x86_64_win64 then
result:=(calloption=pocall_safecall) or
(def.size>8) or not(def.size in [1,2,4,8])
else
result:=inherited ret_in_param(def,calloption);
end;
function tx86_64paramanager.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;
{ true if a parameter is too large to copy and only the address is pushed }
function tx86_64paramanager.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,
formaldef :
result:=true;
recorddef :
begin
{ Win ABI depends on size to pass it in a register or not }
if (target_info.system=system_x86_64_win64) then
result:=not structure_in_registers(varspez,def.size)
else
{ linux ABI always passes it as value parameter }
result:=false;
end;
arraydef :
begin
{ cdecl array of const need to be ignored and therefor be puhsed
as value parameter with length 0 }
if (calloption in [pocall_cdecl,pocall_cppdecl]) and
(is_array_of_const(def) or
is_dynamic_array(def)) then
result:=false
else
result:=true;
end;
objectdef :
begin
if is_object(def) then
result:=not structure_in_registers(varspez,def.size);
end;
stringdef :
begin
if (tstringdef(def).stringtype in [st_shortstring,st_longstring]) then
result:=not structure_in_registers(varspez,def.size);
end;
procvardef :
begin
if (po_methodpointer in tprocvardef(def).procoptions) then
result:=not structure_in_registers(varspez,def.size);
end;
setdef :
result:=(tsetdef(def).settype<>smallset);
end;
end;
function tx86_64paramanager.get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;
begin
if target_info.system=system_x86_64_win64 then
result:=[RS_RAX,RS_RCX,RS_RDX,RS_R8,RS_R9,RS_R10,RS_R11]
else
result:=[RS_RAX,RS_RCX,RS_RDX,RS_RSI,RS_RDI,RS_R8,RS_R9,RS_R10,RS_R11];
end;
function tx86_64paramanager.get_volatile_registers_mm(calloption : tproccalloption):tcpuregisterset;
begin
if target_info.system=system_x86_64_win64 then
result:=[RS_XMM0..RS_XMM5]
else
result:=[RS_XMM0..RS_XMM15];
end;
function tx86_64paramanager.get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;
begin
result:=[RS_ST0..RS_ST7];
end;
procedure tx86_64paramanager.getintparaloc(calloption : tproccalloption; nr : longint;var cgpara:TCGPara);
var
paraloc : pcgparalocation;
begin
cgpara.reset;
cgpara.size:=OS_INT;
cgpara.intsize:=tcgsize2size[OS_INT];
cgpara.alignment:=get_para_align(calloption);
paraloc:=cgpara.add_location;
with paraloc^ do
begin
size:=OS_INT;
if target_info.system=system_x86_64_win64 then
begin
if nr<1 then
internalerror(200304303)
else if nr<=high(paraintsupregs_winx64)+1 then
begin
loc:=LOC_REGISTER;
register:=newreg(R_INTREGISTER,paraintsupregs_winx64[nr-1],R_SUBWHOLE);
end
else
begin
loc:=LOC_REFERENCE;
reference.index:=NR_STACK_POINTER_REG;
reference.offset:=(nr-6)*sizeof(aint);
end;
end
else
begin
if nr<1 then
internalerror(200304303)
else if nr<=high(paraintsupregs)+1 then
begin
loc:=LOC_REGISTER;
register:=newreg(R_INTREGISTER,paraintsupregs[nr-1],R_SUBWHOLE);
end
else
begin
loc:=LOC_REFERENCE;
reference.index:=NR_STACK_POINTER_REG;
reference.offset:=(nr-6)*sizeof(aint);
end;
end;
end;
end;
procedure tx86_64paramanager.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);
{ 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 p.returndef.typ=floatdef then
begin
case tfloatdef(p.returndef).floattype of
s32real,s64real:
begin
p.funcretloc[side].loc:=LOC_MMREGISTER;
p.funcretloc[side].register:=NR_MM_RESULT_REG;
p.funcretloc[side].size:=retcgsize;
end;
s64currency,
s64comp,
s80real:
begin
p.funcretloc[side].loc:=LOC_FPUREGISTER;
p.funcretloc[side].register:=NR_FPU_RESULT_REG;
p.funcretloc[side].size:=retcgsize;
end;
else
internalerror(200405034);
end;
end
else
{ Return in register }
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;
procedure tx86_64paramanager.create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee;paras:tparalist;
var intparareg,mmparareg,parasize:longint;varargsparas: boolean);
var
hp : tparavarsym;
paraloc : pcgparalocation;
subreg : tsubregister;
pushaddr : boolean;
paracgsize : tcgsize;
loc : array[1..2] of tcgloc;
paralen,
locidx,
l,i,
varalign,
paraalign : longint;
begin
paraalign:=get_para_align(p.proccalloption);
{ Register parameters are assigned from left to right }
for i:=0 to paras.count-1 do
begin
hp:=tparavarsym(paras[i]);
pushaddr:=push_addr_param(hp.varspez,hp.vardef,p.proccalloption);
if pushaddr then
begin
loc[1]:=LOC_REGISTER;
loc[2]:=LOC_INVALID;
paracgsize:=OS_ADDR;
paralen:=sizeof(aint);
end
else
begin
getvalueparaloc(hp.varspez,hp.vardef,loc[1],loc[2]);
paralen:=push_size(hp.varspez,hp.vardef,p.proccalloption);
paracgsize:=def_cgsize(hp.vardef);
end;
{ cheat for now, we should copy the value to an mm reg as well (FK) }
if varargsparas and
(target_info.system = system_x86_64_win64) and
(hp.vardef.typ = floatdef) then
begin
loc[1] := LOC_REGISTER;
loc[2] := LOC_INVALID;
if paracgsize = OS_F64 then
paracgsize := OS_64
else
paracgsize := OS_32;
end;
hp.paraloc[side].reset;
hp.paraloc[side].size:=paracgsize;
hp.paraloc[side].intsize:=paralen;
hp.paraloc[side].Alignment:=paraalign;
if paralen>0 then
begin
locidx:=1;
while (paralen>0) do
begin
if locidx>2 then
internalerror(200501283);
{ Enough registers free? }
case loc[locidx] of
LOC_REGISTER :
begin
{ winx64 uses different registers }
if ((target_info.system=system_x86_64_win64) and
(intparareg>high(paraintsupregs_winx64))) or
((target_info.system<>system_x86_64_win64) and
(intparareg>high(paraintsupregs))) then
loc[locidx]:=LOC_REFERENCE;
end;
LOC_MMREGISTER :
begin
{ winx64 uses different registers }
if ((target_info.system=system_x86_64_win64) and
(mmparareg>high(parammsupregs_winx64))) or
((target_info.system<>system_x86_64_win64) and
(mmparareg>high(parammsupregs))) then
loc[locidx]:=LOC_REFERENCE;
end;
end;
{ Allocate }
case loc[locidx] of
LOC_REGISTER :
begin
paraloc:=hp.paraloc[side].add_location;
paraloc^.loc:=LOC_REGISTER;
if (paracgsize=OS_NO) or (loc[2]<>LOC_INVALID) then
begin
paraloc^.size:=OS_INT;
subreg:=R_SUBWHOLE;
end
else
begin
paraloc^.size:=paracgsize;
{ s64comp is pushed in an int register }
if paraloc^.size=OS_C64 then
paraloc^.size:=OS_64;
subreg:=cgsize2subreg(paraloc^.size);
end;
{ winx64 uses different registers }
if target_info.system=system_x86_64_win64 then
paraloc^.register:=newreg(R_INTREGISTER,paraintsupregs_winx64[intparareg],subreg)
else
paraloc^.register:=newreg(R_INTREGISTER,paraintsupregs[intparareg],subreg);
{ matching mm register must be skipped }
if target_info.system=system_x86_64_win64 then
inc(mmparareg);
inc(intparareg);
dec(paralen,tcgsize2size[paraloc^.size]);
end;
LOC_MMREGISTER :
begin
paraloc:=hp.paraloc[side].add_location;
paraloc^.loc:=LOC_MMREGISTER;
{ winx64 uses different registers }
if target_info.system=system_x86_64_win64 then
paraloc^.register:=newreg(R_MMREGISTER,parammsupregs_winx64[mmparareg],R_SUBNONE)
else
paraloc^.register:=newreg(R_MMREGISTER,parammsupregs[mmparareg],R_SUBNONE);
if paracgsize=OS_F128 then
paraloc^.size:=OS_F64
else
paraloc^.size:=paracgsize;
{ matching int register must be skipped }
if target_info.system=system_x86_64_win64 then
inc(intparareg);
inc(mmparareg);
dec(paralen,tcgsize2size[paraloc^.size]);
end;
LOC_REFERENCE :
begin
paraloc:=hp.paraloc[side].add_location;
paraloc^.loc:=LOC_REFERENCE;
{Hack alert!!! We should modify int_cgsize to handle OS_128,
however, since int_cgsize is called in many places in the
compiler where only a few can already handle OS_128, fixing it
properly is out of the question to release 2.2.0 in time. (DM)}
if paracgsize=OS_128 then
if paralen=8 then
paraloc^.size:=OS_64
else if paralen=16 then
paraloc^.size:=OS_128
else
internalerror(200707143)
else if paracgsize in [OS_F32,OS_F64,OS_F80,OS_F128] then
paraloc^.size:=int_float_cgsize(paralen)
else
paraloc^.size:=int_cgsize(paralen);
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;
parasize:=align(parasize+paralen,varalign);
paralen:=0;
end;
end;
if (locidx<2) and
(loc[locidx+1]<>LOC_INVALID) then
inc(locidx);
end;
end
else
begin
paraloc:=hp.paraloc[side].add_location;
paraloc^.loc:=LOC_VOID;
end;
end;
{ Register parameters are assigned from left-to-right, but the
offsets on the stack are right-to-left. There is no need
to reverse the offset, only adapt the calleeside with the
start offset of the first param on the stack }
if side=calleeside then
begin
for i:=0 to paras.count-1 do
begin
hp:=tparavarsym(paras[i]);
paraloc:=hp.paraloc[side].location;
while paraloc<>nil do
begin
with paraloc^ do
if (loc=LOC_REFERENCE) then
inc(reference.offset,target_info.first_parm_offset);
paraloc:=paraloc^.next;
end;
end;
end;
end;
function tx86_64paramanager.create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint;
var
intparareg,mmparareg,
parasize : longint;
begin
intparareg:=0;
mmparareg:=0;
if target_info.system=system_x86_64_win64 then
parasize:=4*8
else
parasize:=0;
{ calculate the registers for the normal parameters }
create_paraloc_info_intern(p,callerside,p.paras,intparareg,mmparareg,parasize,false);
{ append the varargs }
create_paraloc_info_intern(p,callerside,varargspara,intparareg,mmparareg,parasize,true);
{ store used no. of SSE registers, that needs to be passed in %AL }
varargspara.mmregsused:=mmparareg;
result:=parasize;
end;
function tx86_64paramanager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;
var
intparareg,mmparareg,
parasize : longint;
begin
intparareg:=0;
mmparareg:=0;
if target_info.system=system_x86_64_win64 then
parasize:=4*8
else
parasize:=0;
create_paraloc_info_intern(p,side,p.paras,intparareg,mmparareg,parasize,false);
{ Create Function result paraloc }
create_funcretloc_info(p,side);
{ We need to return the size allocated on the stack }
result:=parasize;
end;
begin
paramanager:=tx86_64paramanager.create;
end.
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