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fpc/compiler/ncgmem.pas

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{
$Id$
Copyright (c) 1998-2002 by Florian Klaempfl
Generate assembler for memory related nodes which are
the same for all (most?) processors
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.
****************************************************************************
}
{ This unit generate assembler for memory related nodes.
}
unit ncgmem;
{$i fpcdefs.inc}
interface
uses
node,nmem;
type
tcgloadvmtnode = class(tloadvmtnode)
procedure pass_2;override;
end;
tcghnewnode = class(thnewnode)
procedure pass_2;override;
end;
tcghdisposenode = class(thdisposenode)
procedure pass_2;override;
end;
tcgaddrnode = class(taddrnode)
procedure pass_2;override;
end;
tcgdoubleaddrnode = class(tdoubleaddrnode)
procedure pass_2;override;
end;
tcgderefnode = class(tderefnode)
procedure pass_2;override;
end;
tcgsubscriptnode = class(tsubscriptnode)
procedure pass_2;override;
end;
tcgselfnode = class(tselfnode)
procedure pass_2;override;
end;
tcgwithnode = class(twithnode)
procedure pass_2;override;
end;
implementation
uses
globtype,systems,
cutils,verbose,globals,
symconst,symdef,symsym,paramgr,
aasmbase,aasmtai,aasmcpu,
cgbase,pass_2,
nld,ncon,nadd,
cpuinfo,cpubase,cpupara,
cgobj,cgcpu,
tgobj,rgobj
{$ifdef GDB}
{$ifdef delphi}
,sysutils
{$else}
,strings
{$endif}
,symbase
,gdb
{$endif GDB}
;
{*****************************************************************************
TCGLOADNODE
*****************************************************************************}
procedure tcgloadvmtnode.pass_2;
begin
location_reset(location,LOC_REGISTER,OS_ADDR);
location.register:=rg.getregisterint(exprasmlist);
cg.a_load_sym_ofs_reg(exprasmlist,
newasmsymbol(tobjectdef(tclassrefdef(resulttype.def).pointertype.def).vmt_mangledname),
0,location.register);
end;
{*****************************************************************************
TCGHNEWNODE
*****************************************************************************}
procedure tcghnewnode.pass_2;
begin
{ completely resolved in first pass now }
end;
{*****************************************************************************
TCGHDISPOSENODE
*****************************************************************************}
procedure tcghdisposenode.pass_2;
begin
location_reset(location,LOC_REFERENCE,def_cgsize(resulttype.def));
secondpass(left);
if codegenerror then
exit;
case left.location.loc of
LOC_REGISTER:
begin
if not rg.isaddressregister(left.location.register) then
begin
location_release(exprasmlist,left.location);
location.reference.base := rg.getaddressregister(exprasmlist);
cg.a_load_reg_reg(exprasmlist,OS_ADDR,left.location.register,
location.reference.base);
end
else
location.reference.base := left.location.register;
end;
LOC_CREGISTER,
LOC_CREFERENCE,
LOC_REFERENCE:
begin
location_release(exprasmlist,left.location);
location.reference.base:=rg.getaddressregister(exprasmlist);
cg.a_load_loc_reg(exprasmlist,left.location,location.reference.base);
end;
else
internalerror(2002032217);
end;
end;
{*****************************************************************************
TCGADDRNODE
*****************************************************************************}
procedure tcgaddrnode.pass_2;
begin
secondpass(left);
{ when loading procvar we do nothing with this node, so load the
location of left }
if nf_procvarload in flags then
begin
location_copy(location,left.location);
exit;
end;
location_release(exprasmlist,left.location);
location_reset(location,LOC_REGISTER,OS_ADDR);
location.register:=rg.getaddressregister(exprasmlist);
{@ on a procvar means returning an address to the procedure that
is stored in it.}
{ yes but left.symtableentry can be nil
for example on self !! }
{ symtableentry can be also invalid, if left is no tree node }
if (m_tp_procvar in aktmodeswitches) and
(left.nodetype=loadn) and
assigned(tloadnode(left).symtableentry) and
(tloadnode(left).symtableentry.typ=varsym) and
(tvarsym(tloadnode(left).symtableentry).vartype.def.deftype=procvardef) then
cg.a_load_ref_reg(exprasmlist,OS_ADDR,left.location.reference,
location.register)
else
begin
cg.a_loadaddr_ref_reg(exprasmlist,left.location.reference,
location.register);
end;
end;
{*****************************************************************************
TCGDOUBLEADDRNODE
*****************************************************************************}
procedure tcgdoubleaddrnode.pass_2;
begin
secondpass(left);
location_release(exprasmlist,left.location);
location_reset(location,LOC_REGISTER,OS_ADDR);
location.register:=rg.getaddressregister(exprasmlist);
cg.a_loadaddr_ref_reg(exprasmlist,left.location.reference,
location.register);
end;
{*****************************************************************************
TCGDEREFNODE
*****************************************************************************}
procedure tcgderefnode.pass_2;
begin
secondpass(left);
location_reset(location,LOC_REFERENCE,def_cgsize(resulttype.def));
case left.location.loc of
LOC_REGISTER:
begin
if not rg.isaddressregister(left.location.register) then
begin
location_release(exprasmlist,left.location);
location.reference.base := rg.getaddressregister(exprasmlist);
cg.a_load_reg_reg(exprasmlist,OS_ADDR,left.location.register,
location.reference.base);
end
else
location.reference.base := left.location.register;
end;
LOC_CREGISTER,
LOC_CREFERENCE,
LOC_REFERENCE:
begin
location_release(exprasmlist,left.location);
location.reference.base:=rg.getaddressregister(exprasmlist);
cg.a_load_loc_reg(exprasmlist,left.location,location.reference.base);
end;
end;
if (cs_gdb_heaptrc in aktglobalswitches) and
(cs_checkpointer in aktglobalswitches) then
begin
cg.a_param_reg(exprasmlist, OS_ADDR,location.reference.base,paramanager.getintparaloc(1));
cg.a_call_name(exprasmlist,'FPC_CHECKPOINTER');
end;
end;
{*****************************************************************************
TCGSUBSCRIPTNODE
*****************************************************************************}
procedure tcgsubscriptnode.pass_2;
begin
secondpass(left);
if codegenerror then
exit;
{ classes and interfaces must be dereferenced implicit }
if is_class_or_interface(left.resulttype.def) then
begin
location_reset(location,LOC_REFERENCE,def_cgsize(resulttype.def));
case left.location.loc of
LOC_REGISTER:
begin
if not rg.isaddressregister(left.location.register) then
begin
location_release(exprasmlist,left.location);
location.reference.base:=rg.getaddressregister(exprasmlist);
cg.a_load_reg_reg(exprasmlist,OS_ADDR,
left.location.register,location.reference.base);
end
else
location.reference.base := left.location.register;
end;
LOC_CREGISTER,
LOC_CREFERENCE,
LOC_REFERENCE:
begin
location_release(exprasmlist,left.location);
location.reference.base:=rg.getaddressregister(exprasmlist);
cg.a_load_loc_reg(exprasmlist,left.location,location.reference.base);
end;
end;
end
else if is_interfacecom(left.resulttype.def) then
begin
tg.gettempintfcomreference(exprasmlist,location.reference);
cg.a_load_loc_ref(exprasmlist,left.location,location.reference);
end
else
location_copy(location,left.location);
inc(location.reference.offset,vs.address);
{ also update the size of the location }
location.size:=def_cgsize(resulttype.def);
end;
{*****************************************************************************
TCGSELFNODE
*****************************************************************************}
procedure tcgselfnode.pass_2;
begin
rg.getexplicitregisterint(exprasmlist,SELF_POINTER_REG);
if (resulttype.def.deftype=classrefdef) or
is_class(resulttype.def) then
begin
location_reset(location,LOC_CREGISTER,OS_ADDR);
location.register:=SELF_POINTER_REG;
end
else
begin
location_reset(location,LOC_CREFERENCE,OS_ADDR);
location.reference.base:=SELF_POINTER_REG;
end;
end;
{*****************************************************************************
TCGWITHNODE
*****************************************************************************}
procedure tcgwithnode.pass_2;
var
tmpreg: tregister;
usetemp,with_expr_in_temp : boolean;
{$ifdef GDB}
withstartlabel,withendlabel : tasmlabel;
pp : pchar;
mangled_length : longint;
const
withlevel : longint = 0;
{$endif GDB}
begin
if assigned(left) then
begin
secondpass(left);
{$ifdef i386}
if (left.location.loc in [LOC_REFERENCE,LOC_CREFERENCE]) and
(left.location.reference.segment<>R_NO) then
message(parser_e_no_with_for_variable_in_other_segments);
{$endif i386}
reference_reset(withreference);
usetemp:=false;
if (left.nodetype=loadn) and
(tloadnode(left).symtable=aktprocdef.localst) then
begin
{ for locals use the local storage }
withreference:=left.location.reference;
include(flags,nf_islocal);
end
else
{ call can have happend with a property }
begin
usetemp:=true;
if is_class_or_interface(left.resulttype.def) then
begin
tmpreg := cg.get_scratch_reg_int(exprasmlist);
cg.a_load_loc_reg(exprasmlist,left.location,tmpreg)
end
else
begin
tmpreg := cg.get_scratch_reg_address(exprasmlist);
cg.a_loadaddr_ref_reg(exprasmlist,
left.location.reference,tmpreg);
end;
end;
location_release(exprasmlist,left.location);
{ if the with expression is stored in a temp }
{ area we must make it persistent and shouldn't }
{ release it (FK) }
if (left.location.loc in [LOC_CREFERENCE,LOC_REFERENCE]) and
tg.istemp(left.location.reference) then
begin
tg.normaltemptopersistant(left.location.reference.offset);
with_expr_in_temp:=true;
end
else
with_expr_in_temp:=false;
{ if usetemp is set the value must be in tmpreg }
if usetemp then
begin
tg.gettempofsizereference(exprasmlist,pointer_size,withreference);
tg.normaltemptopersistant(withreference.offset);
{ move to temp reference }
cg.a_load_reg_ref(exprasmlist,OS_ADDR,tmpreg,withreference);
cg.free_scratch_reg(exprasmlist,tmpreg);
{$ifdef GDB}
if (cs_debuginfo in aktmoduleswitches) then
begin
inc(withlevel);
getaddrlabel(withstartlabel);
getaddrlabel(withendlabel);
cg.a_label(exprasmlist,withstartlabel);
withdebugList.concat(Tai_stabs.Create(strpnew(
'"with'+tostr(withlevel)+':'+tostr(symtablestack.getnewtypecount)+
'=*'+tstoreddef(left.resulttype.def).numberstring+'",'+
tostr(N_LSYM)+',0,0,'+tostr(withreference.offset))));
mangled_length:=length(aktprocdef.mangledname);
getmem(pp,mangled_length+50);
strpcopy(pp,'192,0,0,'+withstartlabel.name);
if (target_info.use_function_relative_addresses) then
begin
strpcopy(strend(pp),'-');
strpcopy(strend(pp),aktprocdef.mangledname);
end;
withdebugList.concat(Tai_stabn.Create(strnew(pp)));
end;
{$endif GDB}
end;
{ right can be optimize out !!! }
if assigned(right) then
secondpass(right);
if usetemp then
begin
tg.ungetpersistanttemp(exprasmlist,withreference.offset);
{$ifdef GDB}
if (cs_debuginfo in aktmoduleswitches) then
begin
cg.a_label(exprasmlist,withendlabel);
strpcopy(pp,'224,0,0,'+withendlabel.name);
if (target_info.use_function_relative_addresses) then
begin
strpcopy(strend(pp),'-');
strpcopy(strend(pp),aktprocdef.mangledname);
end;
withdebugList.concat(Tai_stabn.Create(strnew(pp)));
freemem(pp,mangled_length+50);
dec(withlevel);
end;
{$endif GDB}
end;
if with_expr_in_temp then
tg.ungetpersistanttemp(exprasmlist,left.location.reference.offset);
reference_reset(withreference);
end;
end;
begin
cloadvmtnode:=tcgloadvmtnode;
chnewnode:=tcghnewnode;
chdisposenode:=tcghdisposenode;
caddrnode:=tcgaddrnode;
cdoubleaddrnode:=tcgdoubleaddrnode;
cderefnode:=tcgderefnode;
csubscriptnode:=tcgsubscriptnode;
cselfnode:=tcgselfnode;
cwithnode:=tcgwithnode;
end.
{
$Log$
Revision 1.17 2002-07-11 14:41:28 florian
* start of the new generic parameter handling
Revision 1.16 2002/07/07 09:52:32 florian
* powerpc target fixed, very simple units can be compiled
* some basic stuff for better callparanode handling, far from being finished
Revision 1.15 2002/07/01 18:46:23 peter
* internal linker
* reorganized aasm layer
Revision 1.14 2002/07/01 16:23:53 peter
* cg64 patch
* basics for currency
* asnode updates for class and interface (not finished)
Revision 1.13 2002/05/20 13:30:40 carl
* bugfix of hdisponen (base must be set, not index)
* more portability fixes
Revision 1.12 2002/05/18 13:34:09 peter
* readded missing revisions
Revision 1.11 2002/05/16 19:46:37 carl
+ defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
+ try to fix temp allocation (still in ifdef)
+ generic constructor calls
+ start of tassembler / tmodulebase class cleanup
Revision 1.9 2002/05/12 16:53:07 peter
* moved entry and exitcode to ncgutil and cgobj
* foreach gets extra argument for passing local data to the
iterator function
* -CR checks also class typecasts at runtime by changing them
into as
* fixed compiler to cycle with the -CR option
* fixed stabs with elf writer, finally the global variables can
be watched
* removed a lot of routines from cga unit and replaced them by
calls to cgobj
* u32bit-s32bit updates for and,or,xor nodes. When one element is
u32bit then the other is typecasted also to u32bit without giving
a rangecheck warning/error.
* fixed pascal calling method with reversing also the high tree in
the parast, detected by tcalcst3 test
Revision 1.8 2002/04/20 21:32:23 carl
+ generic FPC_CHECKPOINTER
+ first parameter offset in stack now portable
* rename some constants
+ move some cpu stuff to other units
- remove unused constents
* fix stacksize for some targets
* fix generic size problems which depend now on EXTEND_SIZE constant
Revision 1.7 2002/04/15 18:58:47 carl
+ target_info.size_of_pointer -> pointer_Size
Revision 1.6 2002/04/04 19:05:57 peter
* removed unused units
* use tlocation.size in cg.a_*loc*() routines
Revision 1.5 2002/04/02 17:11:28 peter
* tlocation,treference update
* LOC_CONSTANT added for better constant handling
* secondadd splitted in multiple routines
* location_force_reg added for loading a location to a register
of a specified size
* secondassignment parses now first the right and then the left node
(this is compatible with Kylix). This saves a lot of push/pop especially
with string operations
* adapted some routines to use the new cg methods
Revision 1.4 2002/03/31 20:26:34 jonas
+ a_loadfpu_* and a_loadmm_* methods in tcg
* register allocation is now handled by a class and is mostly processor
independent (+rgobj.pas and i386/rgcpu.pas)
* temp allocation is now handled by a class (+tgobj.pas, -i386\tgcpu.pas)
* some small improvements and fixes to the optimizer
* some register allocation fixes
* some fpuvaroffset fixes in the unary minus node
* push/popusedregisters is now called rg.save/restoreusedregisters and
(for i386) uses temps instead of push/pop's when using -Op3 (that code is
also better optimizable)
* fixed and optimized register saving/restoring for new/dispose nodes
* LOC_FPU locations now also require their "register" field to be set to
R_ST, not R_ST0 (the latter is used for LOC_CFPUREGISTER locations only)
- list field removed of the tnode class because it's not used currently
and can cause hard-to-find bugs
}
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