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{
Copyright (c) 2002-2010 by Florian Klaempfl and Jonas Maebe
This unit contains the CPU specific part of tprocinfo
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 cpupi;
{$i fpcdefs.inc}
interface
uses
cutils,globtype,
procinfo,cpuinfo, symtype,aasmbase,
psub, cclasses;
type
{ tcpuprocinfo }
tcpuprocinfo=class(tcgprocinfo)
public
function calc_stackframe_size : longint;override;
procedure setup_eh; override;
procedure postprocess_code; override;
procedure set_first_temp_offset;override;
end;
implementation
uses
systems,globals,cpubase,tgcpu,aasmdata,aasmcpu,aasmtai,cgexcept,
tgobj,paramgr,symconst,symcpu;
{*****************************************************************************
twasmexceptionstatehandler
*****************************************************************************}
type
twasmexceptionstatehandler = class(tcgexceptionstatehandler)
class procedure new_exception(list:TAsmList;const t:texceptiontemps; const exceptframekind: texceptframekind; out exceptstate: texceptionstate); override;
class procedure free_exception(list: TAsmList; const t: texceptiontemps; const s: texceptionstate; a: aint; endexceptlabel: tasmlabel; onlyfree:boolean); override;
class procedure handle_nested_exception(list:TAsmList;var t:texceptiontemps;var entrystate: texceptionstate); override;
end;
class procedure twasmexceptionstatehandler.new_exception(list:TAsmList;const t:texceptiontemps; const exceptframekind: texceptframekind; out exceptstate: texceptionstate);
begin
list.Concat(tai_comment.Create(strpnew('TODO: new_exception')));
end;
class procedure twasmexceptionstatehandler.free_exception(list: TAsmList; const t: texceptiontemps; const s: texceptionstate; a: aint; endexceptlabel: tasmlabel; onlyfree:boolean);
begin
list.Concat(tai_comment.Create(strpnew('TODO: free_exception')));
end;
class procedure twasmexceptionstatehandler.handle_nested_exception(list:TAsmList;var t:texceptiontemps;var entrystate: texceptionstate);
begin
list.Concat(tai_comment.Create(strpnew('TODO: handle_nested_exception')));
end;
{*****************************************************************************
tcpuprocinfo
*****************************************************************************}
function tcpuprocinfo.calc_stackframe_size: longint;
begin
{ the stack frame in WebAssembly should always have a 16-byte alignment }
Result:=Align(inherited calc_stackframe_size,16);
end;
procedure tcpuprocinfo.setup_eh;
begin
cexceptionstatehandler:=twasmexceptionstatehandler;
end;
procedure tcpuprocinfo.postprocess_code;
function findfirst_tai_functype(asmlist: TAsmList): tai_functype;
var
hp: tai;
begin
result:=nil;
if not assigned(asmlist) then
exit;
hp:=tai(asmlist.first);
while assigned(hp) do
begin
if hp.typ=ait_functype then
begin
result:=tai_functype(hp);
exit;
end;
hp:=tai(hp.Next);
end;
end;
procedure replace_local_frame_pointer(asmlist: TAsmList);
var
hp: tai;
instr: taicpu;
l: Integer;
begin
if not assigned(asmlist) then
exit;
hp:=tai(asmlist.first);
while assigned(hp) do
begin
if hp.typ=ait_instruction then
begin
instr:=taicpu(hp);
for l:=0 to instr.ops-1 do
if (instr.oper[l]^.typ=top_reg) and (instr.oper[l]^.reg=NR_LOCAL_FRAME_POINTER_REG) then
instr.loadref(l,tcpuprocdef(current_procinfo.procdef).frame_pointer_ref);
end;
hp:=tai(hp.Next);
end;
end;
var
templist : TAsmList;
l : TWasmLocal;
first: Boolean;
local: tai_local;
begin
templist:=TAsmList.create;
local:=nil;
first:=true;
l:=ttgwasm(tg).localvars.first;
while Assigned(l) do
begin
local:=tai_local.create(l.typ);
local.first:=first;
first:=false;
templist.Concat(local);
l:=l.nextseq;
end;
if assigned(local) then
local.last:=true;
aktproccode.insertListAfter(findfirst_tai_functype(aktproccode),templist);
templist.Free;
replace_local_frame_pointer(aktproccode);
inherited postprocess_code;
end;
procedure tcpuprocinfo.set_first_temp_offset;
var
sz : integer;
i : integer;
sym: tsym;
begin
{
Stackframe layout:
sp:
<incoming parameters>
sp+first_temp_offset:
<locals>
<temp>
}
procdef.init_paraloc_info(calleeside);
sz := procdef.calleeargareasize;
tg.setfirsttemp(sz);
end;
initialization
cprocinfo:=tcpuprocinfo;
end.
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