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{
Copyright (c) 2014 by Florian Klaempfl
Symbol table overrides for x86
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 symx86;
{$i fpcdefs.inc}
interface
uses
globtype, cclasses,
symconst, symtype,symdef,symsym;
type
tx86pointerdef = class(tpointerdef)
protected
procedure ppuload_platform(ppufile: tcompilerppufile); override;
procedure ppuwrite_platform(ppufile: tcompilerppufile); override;
public
x86pointertyp : tx86pointertyp;
constructor create(def: tdef); override;
class function getreusable(def: tdef): tpointerdef; override;
class function getreusablex86(def: tdef; x86typ: tx86pointertyp): tpointerdef;
constructor createx86(def:tdef;x86typ:tx86pointertyp);virtual;
function size: asizeint; override;
function getcopy: tstoreddef; override;
function GetTypeName: string; override;
class function default_x86_data_pointer_type: tx86pointertyp; virtual;
function compatible_with_pointerdef_size(ptr: tpointerdef): boolean; override;
end;
tx86pointerdefclass = class of tx86pointerdef;
tx86procvardef = class(tprocvardef)
function compatible_with_pointerdef_size(ptr: tpointerdef): boolean; override;
end;
tx86procvardefclass = class of tx86procvardef;
tx86procdef = class(tprocdef)
function compatible_with_pointerdef_size(ptr: tpointerdef): boolean; override;
end;
tx86procdefclass = class of tx86procdef;
implementation
uses
globals, verbose,
symbase, fmodule;
{****************************************************************************
tx86pointerdef
****************************************************************************}
procedure tx86pointerdef.ppuload_platform(ppufile: tcompilerppufile);
begin
inherited;
x86pointertyp:=tx86pointertyp(ppufile.getbyte);
end;
procedure tx86pointerdef.ppuwrite_platform(ppufile: tcompilerppufile);
begin
inherited;
ppufile.putbyte(byte(x86pointertyp));
end;
constructor tx86pointerdef.create(def: tdef);
begin
inherited create(def);
x86pointertyp := default_x86_data_pointer_type;
end;
class function tx86pointerdef.getreusable(def: tdef): tpointerdef;
begin
result:=getreusablex86(def,default_x86_data_pointer_type);
end;
class function tx86pointerdef.getreusablex86(def: tdef; x86typ: tx86pointertyp): tpointerdef;
type
tx86PtrDefKey = packed record
def: tdef;
x86typ:tx86pointertyp;
end;
var
res: PHashSetItem;
oldsymtablestack: tsymtablestack;
key: tx86PtrDefKey;
begin
if not assigned(current_module) then
internalerror(2011071102);
key.def:=def;
key.x86typ:=x86typ;
res:=current_module.ptrdefs.FindOrAdd(@key,sizeof(key));
if not assigned(res^.Data) then
begin
{ since these pointerdefs can be reused anywhere in the current
unit, add them to the global/staticsymtable (or local symtable
if they're a local def, because otherwise they'll be saved
to the ppu referencing a local symtable entry that doesn't
exist in the ppu) }
oldsymtablestack:=symtablestack;
{ do not simply push/pop current_module.localsymtable, because
that can have side-effects (e.g., it removes helpers) }
symtablestack:=nil;
result:=tx86pointerdefclass(cpointerdef).createx86(def,x86typ);
setup_reusable_def(def,result,res,oldsymtablestack);
{ res^.Data may still be nil -> don't overwrite result }
exit;
end;
result:=tpointerdef(res^.Data);
end;
constructor tx86pointerdef.createx86(def: tdef; x86typ: tx86pointertyp);
begin
inherited create(def);
x86pointertyp:=x86typ;
end;
function tx86pointerdef.size: asizeint;
begin
if x86pointertyp in [x86pt_far,x86pt_huge] then
result:=sizeof(pint)+2
else
result:=inherited;
end;
function tx86pointerdef.getcopy: tstoreddef;
begin
result:=inherited;
tx86pointerdef(result).x86pointertyp:=x86pointertyp;
end;
function tx86pointerdef.GetTypeName: string;
begin
result:=inherited;
if x86pointertyp<>default_x86_data_pointer_type then
begin
case x86pointertyp of
x86pt_near:
result:=result+';near';
x86pt_near_cs:
result:=result+';near ''CS''';
x86pt_near_ds:
result:=result+';near ''DS''';
x86pt_near_ss:
result:=result+';near ''SS''';
x86pt_near_es:
result:=result+';near ''ES''';
x86pt_near_fs:
result:=result+';near ''FS''';
x86pt_near_gs:
result:=result+';near ''GS''';
x86pt_far:
result:=result+';far';
x86pt_huge:
result:=result+';huge';
end;
end;
end;
class function tx86pointerdef.default_x86_data_pointer_type: tx86pointertyp;
begin
result:=x86pt_near;
end;
function tx86pointerdef.compatible_with_pointerdef_size(ptr: tpointerdef): boolean;
begin
result:=
inherited and
(x86pointertyp=tx86pointerdef(ptr).x86pointertyp);
end;
{****************************************************************************
tx86procvardef
****************************************************************************}
function tx86procvardef.compatible_with_pointerdef_size(ptr: tpointerdef): boolean;
begin
result:=
inherited and
(tx86pointerdef(address_type).x86pointertyp=tx86pointerdef(ptr).x86pointertyp);
end;
{****************************************************************************
tx86procdef
****************************************************************************}
function tx86procdef.compatible_with_pointerdef_size(ptr: tpointerdef): boolean;
begin
result:=
inherited and
(tx86pointerdef(address_type).x86pointertyp=tx86pointerdef(ptr).x86pointertyp);
end;
end.
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