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{
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.
****************************************************************************
}
unit parabase;
{$i fpcdefs.inc}
interface
uses
cclasses,globtype,
cpubase,cgbase,cgutils;
type
TCGParaReference = record
index : tregister;
offset : aint;
end;
PCGParaLocation = ^TCGParaLocation;
TCGParaLocation = record
Next : PCGParaLocation;
Size : TCGSize; { size of this location }
Loc : TCGLoc;
case TCGLoc of
LOC_REFERENCE : (reference : TCGParaReference);
LOC_FPUREGISTER,
LOC_CFPUREGISTER,
LOC_MMREGISTER,
LOC_CMMREGISTER,
LOC_REGISTER,
LOC_CREGISTER : (register : tregister);
end;
TCGPara = object
Location : PCGParalocation;
Alignment : ShortInt;
Size : TCGSize; { Size of the parameter included in all locations }
IntSize: aint; { size of the total location in bytes }
{$ifdef powerpc}
composite: boolean; { under the AIX abi, how certain parameters are passed depends on whether they are composite or not }
{$endif powerpc}
constructor init;
destructor done;
procedure reset;
function getcopy:tcgpara;
procedure check_simple_location;
function add_location:pcgparalocation;
procedure get_location(var newloc:tlocation);
end;
tvarargsinfo = (
va_uses_float_reg
);
tparalist = class(tlist)
procedure SortParas;
end;
tvarargsparalist = class(tparalist)
varargsinfo : set of tvarargsinfo;
{$ifdef x86_64}
{ x86_64 requires %al to contain the no. SSE regs passed }
mmregsused : longint;
{$endif x86_64}
end;
implementation
uses
systems,verbose,
symsym;
{****************************************************************************
TCGPara
****************************************************************************}
constructor tcgpara.init;
begin
alignment:=0;
size:=OS_NO;
intsize:=0;
location:=nil;
{$ifdef powerpc}
composite:=false;
{$endif powerpc}
end;
destructor tcgpara.done;
begin
reset;
end;
procedure tcgpara.reset;
var
hlocation : pcgparalocation;
begin
while assigned(location) do
begin
hlocation:=location^.next;
dispose(location);
location:=hlocation;
end;
alignment:=0;
size:=OS_NO;
intsize:=0;
{$ifdef powerpc}
composite:=false;
{$endif powerpc}
end;
function tcgpara.getcopy:tcgpara;
var
hlocation : pcgparalocation;
begin
result.init;
while assigned(location) do
begin
hlocation:=result.add_location;
hlocation^:=location^;
hlocation^.next:=nil;
location:=location^.next;
end;
result.alignment:=alignment;
result.size:=size;
result.intsize:=intsize;
{$ifdef powerpc}
result.composite:=composite;
{$endif powerpc}
end;
function tcgpara.add_location:pcgparalocation;
var
prevlocation,
hlocation : pcgparalocation;
begin
prevlocation:=nil;
hlocation:=location;
while assigned(hlocation) do
begin
prevlocation:=hlocation;
hlocation:=hlocation^.next;
end;
new(hlocation);
Fillchar(hlocation^,sizeof(tcgparalocation),0);
if assigned(prevlocation) then
prevlocation^.next:=hlocation
else
location:=hlocation;
result:=hlocation;
end;
procedure tcgpara.check_simple_location;
begin
if not assigned(location) then
internalerror(200408161);
if assigned(location^.next) then
internalerror(200408162);
end;
procedure tcgpara.get_location(var newloc:tlocation);
begin
if not assigned(location) then
internalerror(200408205);
fillchar(newloc,sizeof(newloc),0);
newloc.loc:=location^.loc;
newloc.size:=size;
case location^.loc of
LOC_REGISTER :
begin
{$ifndef cpu64bit}
if size in [OS_64,OS_S64] then
begin
if not assigned(location^.next) then
internalerror(200408206);
if (location^.next^.loc<>LOC_REGISTER) then
internalerror(200408207);
if (target_info.endian = ENDIAN_BIG) then
begin
newloc.register64.reghi:=location^.register;
newloc.register64.reglo:=location^.next^.register;
end
else
begin
newloc.register64.reglo:=location^.register;
newloc.register64.reghi:=location^.next^.register;
end;
end
else
{$endif}
newloc.register:=location^.register;
end;
LOC_FPUREGISTER,
LOC_MMREGISTER :
newloc.register:=location^.register;
LOC_REFERENCE :
begin
newloc.reference.base:=location^.reference.index;
newloc.reference.offset:=location^.reference.offset;
end;
end;
end;
{****************************************************************************
TParaList
****************************************************************************}
function ParaNrCompare(Item1, Item2: Pointer): Integer;
var
I1 : tparavarsym absolute Item1;
I2 : tparavarsym absolute Item2;
begin
Result:=I1.paranr-I2.paranr;
end;
procedure TParaList.SortParas;
begin
Sort(@ParaNrCompare);
end;
end.
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