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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 : (
{ The number of bits the value in the register must be shifted to the left before
it can be stored to memory in the function prolog.
This is used for passing OS_NO memory blocks less than register size and of "odd"
(3, 5, 6, 7) size on big endian machines, so that small memory blocks passed via
registers are properly aligned.
E.g. the value $5544433 is passed in bits 40-63 of the register (others are zero),
but they should actually be stored in the first bits of the stack location reserved
for this value. So they have to be shifted left by this amount of bits before. }
{$IFDEF POWERPC64}shiftval : byte;{$ENDIF POWERPC64}
register : tregister);
end;
TCGPara = object
Location : PCGParalocation;
Alignment : ShortInt;
Size : TCGSize; { Size of the parameter included in all locations }
IntSize: aint; { size of the total location in bytes }
{$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:=longint(I1.paranr)-longint(I2.paranr);
end;
procedure TParaList.SortParas;
begin
Sort(@ParaNrCompare);
end;
end.
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