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a6cfe4083a
fpc/compiler/nbas.pas
Jonas Maebe a6cfe4083a + tempcreate/ref/delete nodes (allows the use of temps in the 
resulttype and first pass)
  * made handling of read(ln)/write(ln) processor independent
  * moved processor independent handling for str and reset/rewrite-typed
    from firstpass to resulttype pass
  * changed names of helpers in text.inc to be generic for use as
    compilerprocs + added "iocheck" directive for most of them
  * reading of ordinals is done by procedures instead of functions
    because otherwise FPC_IOCHECK overwrote the result before it could
    be stored elsewhere (range checking still works)
  * compilerprocs can now be used in the system unit before they are
    implemented
  * added note to errore.msg that booleans can't be read using read/readln
2001-08-23 14:28:35 +00:00

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{
$Id$
Copyright (c) 2000 by Florian Klaempfl
This unit implements some basic nodes
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 nbas;
{$i defines.inc}
interface
uses
aasm,symtype,node,cpubase;
type
tnothingnode = class(tnode)
constructor create;virtual;
function pass_1 : tnode;override;
function det_resulttype:tnode;override;
end;
terrornode = class(tnode)
constructor create;virtual;
function pass_1 : tnode;override;
function det_resulttype:tnode;override;
end;
tasmnode = class(tnode)
p_asm : taasmoutput;
constructor create(p : taasmoutput);virtual;
destructor destroy;override;
function getcopy : tnode;override;
function pass_1 : tnode;override;
function det_resulttype:tnode;override;
function docompare(p: tnode): boolean; override;
end;
tstatementnode = class(tbinarynode)
constructor create(l,r : tnode);virtual;
function pass_1 : tnode;override;
function det_resulttype:tnode;override;
{$ifdef extdebug}
procedure dowrite;override;
{$endif extdebug}
end;
tblocknode = class(tunarynode)
constructor create(l : tnode);virtual;
function pass_1 : tnode;override;
function det_resulttype:tnode;override;
end;
{ to allow access to the location by temp references even after the temp has }
{ already been disposed and to make sure the coherency between temps and }
{ temp references is kept after a getcopy }
ptempinfo = ^ttempinfo;
ttempinfo = record
{ set to the copy of a tempcreate pnode (if it gets copied) so that the }
{ refs and deletenode can hook to this copy once they get copied too }
hookoncopy: ptempinfo;
ref: treference;
restype: ttype;
valid: boolean;
end;
{ a node which will create a *persistent* temp of a given type with a given size }
{ (the size is separate to allow creating "void" temps with a custom size) }
ttempcreatenode = class(tnode)
size: longint;
tempinfo: ptempinfo;
constructor create(const _restype: ttype; _size: longint); virtual;
function getcopy: tnode; override;
function pass_1 : tnode; override;
function det_resulttype: tnode; override;
function docompare(p: tnode): boolean; override;
end;
{ a node which is a reference to a certain temp }
ttemprefnode = class(tnode)
constructor create(const temp: ttempcreatenode); virtual;
function getcopy: tnode; override;
function pass_1 : tnode; override;
function det_resulttype : tnode; override;
function docompare(p: tnode): boolean; override;
protected
tempinfo: ptempinfo;
end;
{ a node which removes a temp }
ttempdeletenode = class(tnode)
constructor create(const temp: ttempcreatenode);
function getcopy: tnode; override;
function pass_1: tnode; override;
function det_resulttype: tnode; override;
function docompare(p: tnode): boolean; override;
destructor destroy; override;
protected
tempinfo: ptempinfo;
end;
var
cnothingnode : class of tnothingnode;
cerrornode : class of terrornode;
casmnode : class of tasmnode;
cstatementnode : class of tstatementnode;
cblocknode : class of tblocknode;
ctempcreatenode : class of ttempcreatenode;
ctemprefnode : class of ttemprefnode;
ctempdeletenode : class of ttempdeletenode;
implementation
uses
cutils,
verbose,globals,globtype,systems,
symconst,symdef,symsym,types,
pass_1,
ncal,nflw,tgcpu,hcodegen
{$ifdef newcg}
,cgbase
{$endif}
;
{*****************************************************************************
TFIRSTNOTHING
*****************************************************************************}
constructor tnothingnode.create;
begin
inherited create(nothingn);
end;
function tnothingnode.det_resulttype:tnode;
begin
result:=nil;
resulttype:=voidtype;
end;
function tnothingnode.pass_1 : tnode;
begin
result:=nil;
end;
{*****************************************************************************
TFIRSTERROR
*****************************************************************************}
constructor terrornode.create;
begin
inherited create(errorn);
end;
function terrornode.det_resulttype:tnode;
begin
result:=nil;
include(flags,nf_error);
codegenerror:=true;
resulttype:=generrortype;
end;
function terrornode.pass_1 : tnode;
begin
result:=nil;
codegenerror:=true;
end;
{*****************************************************************************
TSTATEMENTNODE
*****************************************************************************}
constructor tstatementnode.create(l,r : tnode);
begin
inherited create(statementn,l,r);
end;
function tstatementnode.det_resulttype:tnode;
begin
result:=nil;
resulttype:=voidtype;
{ right is the statement itself calln assignn or a complex one }
resulttypepass(right);
if (not (cs_extsyntax in aktmoduleswitches)) and
assigned(right.resulttype.def) and
not((right.nodetype=calln) and
(tcallnode(right).procdefinition.proctypeoption=potype_constructor)) and
not(is_void(right.resulttype.def)) then
CGMessage(cg_e_illegal_expression);
if codegenerror then
exit;
{ left is the next in the list }
resulttypepass(left);
if codegenerror then
exit;
end;
function tstatementnode.pass_1 : tnode;
begin
result:=nil;
{ no temps over several statements }
{$ifdef newcg}
tg.cleartempgen;
{$else newcg}
cleartempgen;
{$endif newcg}
{ right is the statement itself calln assignn or a complex one }
firstpass(right);
if codegenerror then
exit;
registers32:=right.registers32;
registersfpu:=right.registersfpu;
{$ifdef SUPPORT_MMX}
registersmmx:=right.registersmmx;
{$endif SUPPORT_MMX}
{ left is the next in the list }
firstpass(left);
if codegenerror then
exit;
if right.registers32>registers32 then
registers32:=right.registers32;
if right.registersfpu>registersfpu then
registersfpu:=right.registersfpu;
{$ifdef SUPPORT_MMX}
if right.registersmmx>registersmmx then
registersmmx:=right.registersmmx;
{$endif}
end;
{$ifdef extdebug}
procedure tstatementnode.dowrite;
begin
{ can't use inherited dowrite, because that will use the
binary which we don't want for statements }
dowritenodetype;
writeln(',');
{ write the statement }
writenodeindention:=writenodeindention+' ';
writenode(right);
writeln(')');
delete(writenodeindention,1,4);
{ go on with the next statement }
writenode(left);
end;
{$endif}
{*****************************************************************************
TBLOCKNODE
*****************************************************************************}
constructor tblocknode.create(l : tnode);
begin
inherited create(blockn,l);
end;
function tblocknode.det_resulttype:tnode;
var
hp : tstatementnode;
begin
result:=nil;
resulttype:=voidtype;
hp:=tstatementnode(left);
while assigned(hp) do
begin
if assigned(hp.right) then
begin
codegenerror:=false;
resulttypepass(hp.right);
if (not (cs_extsyntax in aktmoduleswitches)) and
assigned(hp.right.resulttype.def) and
not((hp.right.nodetype=calln) and
(tcallnode(hp.right).procdefinition.proctypeoption=potype_constructor)) and
not(is_void(hp.right.resulttype.def)) then
CGMessage(cg_e_illegal_expression);
end;
hp:=tstatementnode(hp.left);
end;
end;
function tblocknode.pass_1 : tnode;
var
hp : tstatementnode;
count : longint;
begin
result:=nil;
count:=0;
hp:=tstatementnode(left);
while assigned(hp) do
begin
if cs_regalloc in aktglobalswitches then
begin
{ node transformations }
{ concat function result to exit }
{ this is wrong for string or other complex
result types !!! }
if {ret_in_acc(aktprocsym.definition.rettype.def) and }
(is_ordinal(aktprocsym.definition.rettype.def) or
is_smallset(aktprocsym.definition.rettype.def)) and
assigned(hp.left) and
assigned(tstatementnode(hp.left).right) and
(tstatementnode(hp.left).right.nodetype=exitn) and
(hp.right.nodetype=assignn) and
{ !!!! this tbinarynode should be tassignmentnode }
(tbinarynode(hp.right).left.nodetype=funcretn) then
begin
if assigned(texitnode(tstatementnode(hp.left).right).left) then
CGMessage(cg_n_inefficient_code)
else
begin
texitnode(tstatementnode(hp.left).right).left:=tstatementnode(hp.right).right;
tstatementnode(hp.right).right:=nil;
hp.right.free;
hp.right:=nil;
end;
end
{ warning if unreachable code occurs and elimate this }
else if (hp.right.nodetype in
[exitn,breakn,continuen,goton]) and
{ statement node (JM) }
assigned(hp.left) and
{ kind of statement! (JM) }
assigned(tstatementnode(hp.left).right) and
(tstatementnode(hp.left).right.nodetype<>labeln) then
begin
{ use correct line number }
aktfilepos:=hp.left.fileinfo;
hp.left.free;
hp.left:=nil;
CGMessage(cg_w_unreachable_code);
{ old lines }
aktfilepos:=hp.right.fileinfo;
end;
end;
if assigned(hp.right) then
begin
{$ifdef newcg}
tg.cleartempgen;
{$else newcg}
cleartempgen;
{$endif newcg}
codegenerror:=false;
firstpass(hp.right);
hp.registers32:=hp.right.registers32;
hp.registersfpu:=hp.right.registersfpu;
{$ifdef SUPPORT_MMX}
hp.registersmmx:=hp.right.registersmmx;
{$endif SUPPORT_MMX}
end
else
hp.registers32:=0;
if hp.registers32>registers32 then
registers32:=hp.registers32;
if hp.registersfpu>registersfpu then
registersfpu:=hp.registersfpu;
{$ifdef SUPPORT_MMX}
if hp.registersmmx>registersmmx then
registersmmx:=hp.registersmmx;
{$endif}
inc(count);
hp:=tstatementnode(hp.left);
end;
end;
{*****************************************************************************
TASMNODE
*****************************************************************************}
constructor tasmnode.create(p : taasmoutput);
begin
inherited create(asmn);
p_asm:=p;
end;
destructor tasmnode.destroy;
begin
if assigned(p_asm) then
p_asm.free;
inherited destroy;
end;
function tasmnode.getcopy: tnode;
var
n: tasmnode;
begin
n := tasmnode(inherited getcopy);
if assigned(p_asm) then
begin
n.p_asm:=taasmoutput.create;
n.p_asm.concatlistcopy(p_asm);
end
else n.p_asm := nil;
getcopy := n;
end;
function tasmnode.det_resulttype:tnode;
begin
result:=nil;
resulttype:=voidtype;
end;
function tasmnode.pass_1 : tnode;
begin
result:=nil;
procinfo^.flags:=procinfo^.flags or pi_uses_asm;
end;
function tasmnode.docompare(p: tnode): boolean;
begin
{ comparing of asmlists is not implemented (JM) }
docompare := false;
end;
{*****************************************************************************
TEMPCREATENODE
*****************************************************************************}
constructor ttempcreatenode.create(const _restype: ttype; _size: longint);
begin
inherited create(tempn);
size := _size;
new(tempinfo);
fillchar(tempinfo^,sizeof(tempinfo^),0);
tempinfo^.restype := _restype;
end;
function ttempcreatenode.getcopy: tnode;
var
n: ttempcreatenode;
begin
n := ttempcreatenode(inherited getcopy);
n.size := size;
new(n.tempinfo);
fillchar(n.tempinfo^,sizeof(n.tempinfo^),0);
n.tempinfo^.restype := tempinfo^.restype;
{ signal the temprefs that the temp they point to has been copied, }
{ so that if the refs get copied as well, they can hook themselves }
{ to the copy of the temp }
tempinfo^.hookoncopy := n.tempinfo;
result := n;
end;
function ttempcreatenode.pass_1 : tnode;
begin
result := nil;
end;
function ttempcreatenode.det_resulttype: tnode;
begin
result := nil;
{ a tempcreatenode doesn't have a resulttype, only temprefnodes do }
resulttype := voidtype;
end;
function ttempcreatenode.docompare(p: tnode): boolean;
begin
result :=
inherited docompare(p) and
(ttempcreatenode(p).size = size) and
is_equal(ttempcreatenode(p).tempinfo^.restype.def,tempinfo^.restype.def);
end;
{*****************************************************************************
TEMPREFNODE
*****************************************************************************}
constructor ttemprefnode.create(const temp: ttempcreatenode);
begin
inherited create(temprefn);
tempinfo := temp.tempinfo;
end;
function ttemprefnode.getcopy: tnode;
var
n: ttemprefnode;
begin
n := ttemprefnode(inherited getcopy);
if assigned(tempinfo^.hookoncopy) then
{ if the temp has been copied, assume it becomes a new }
{ temp which has to be hooked by the copied reference }
begin
{ hook the ref to the copied temp }
n.tempinfo := tempinfo^.hookoncopy;
end
else
{ if the temp we refer to hasn't been copied, assume }
{ we're just a new reference to that temp }
begin
n.tempinfo := tempinfo;
end;
result := n;
end;
function ttemprefnode.pass_1 : tnode;
begin
result := nil;
end;
function ttemprefnode.det_resulttype: tnode;
begin
{ check if the temp is already resulttype passed }
if not assigned(tempinfo^.restype.def) then
internalerror(200108233);
result := nil;
resulttype := tempinfo^.restype;
end;
function ttemprefnode.docompare(p: tnode): boolean;
begin
result :=
inherited docompare(p) and
(ttemprefnode(p).tempinfo = tempinfo);
end;
{*****************************************************************************
TEMPDELETENODE
*****************************************************************************}
constructor ttempdeletenode.create(const temp: ttempcreatenode);
begin
inherited create(temprefn);
tempinfo := temp.tempinfo;
end;
function ttempdeletenode.getcopy: tnode;
var
n: ttempdeletenode;
begin
n := ttempdeletenode(inherited getcopy);
if assigned(tempinfo^.hookoncopy) then
{ if the temp has been copied, assume it becomes a new }
{ temp which has to be hooked by the copied deletenode }
begin
{ hook the tempdeletenode to the copied temp }
n.tempinfo := tempinfo^.hookoncopy;
end
else
{ if the temp we refer to hasn't been copied, we have a }
{ problem since that means we now have two delete nodes }
{ for one temp }
internalerror(200108234);
result := n;
end;
function ttempdeletenode.pass_1 : tnode;
begin
result := nil;
end;
function ttempdeletenode.det_resulttype: tnode;
begin
result := nil;
resulttype := voidtype;
end;
function ttempdeletenode.docompare(p: tnode): boolean;
begin
result :=
inherited docompare(p) and
(ttemprefnode(p).tempinfo = tempinfo);
end;
destructor ttempdeletenode.destroy;
begin
dispose(tempinfo);
end;
begin
cnothingnode:=tnothingnode;
cerrornode:=terrornode;
casmnode:=tasmnode;
cstatementnode:=tstatementnode;
cblocknode:=tblocknode;
ctempcreatenode:=ttempcreatenode;
ctemprefnode:=ttemprefnode;
ctempdeletenode:=ttempdeletenode;
end.
{
$Log$
Revision 1.14 2001-08-23 14:28:35 jonas
+ tempcreate/ref/delete nodes (allows the use of temps in the
resulttype and first pass)
* made handling of read(ln)/write(ln) processor independent
* moved processor independent handling for str and reset/rewrite-typed
from firstpass to resulttype pass
* changed names of helpers in text.inc to be generic for use as
compilerprocs + added "iocheck" directive for most of them
* reading of ordinals is done by procedures instead of functions
because otherwise FPC_IOCHECK overwrote the result before it could
be stored elsewhere (range checking still works)
* compilerprocs can now be used in the system unit before they are
implemented
* added note to errore.msg that booleans can't be read using read/readln
Revision 1.13 2001/08/06 21:40:46 peter
* funcret moved from tprocinfo to tprocdef
Revision 1.12 2001/06/11 17:41:12 jonas
* fixed web bug 1501 in conjunction with -Or
Revision 1.11 2001/05/18 22:31:06 peter
* tasmnode.pass_2 is independent of cpu, moved to ncgbas
* include ncgbas for independent nodes
Revision 1.10 2001/04/13 01:22:08 peter
* symtable change to classes
* range check generation and errors fixed, make cycle DEBUG=1 works
* memory leaks fixed
Revision 1.9 2001/04/02 21:20:30 peter
* resulttype rewrite
Revision 1.8 2001/02/05 20:45:49 peter
* fixed buf 1364
Revision 1.7 2000/12/31 11:14:10 jonas
+ implemented/fixed docompare() mathods for all nodes (not tested)
+ nopt.pas, nadd.pas, i386/n386opt.pas: optimized nodes for adding strings
and constant strings/chars together
* n386add.pas: don't copy temp strings (of size 256) to another temp string
when adding
Revision 1.6 2000/12/25 00:07:26 peter
+ new tlinkedlist class (merge of old tstringqueue,tcontainer and
tlinkedlist objects)
Revision 1.5 2000/11/29 00:30:31 florian
* unused units removed from uses clause
* some changes for widestrings
Revision 1.4 2000/10/31 22:02:47 peter
* symtable splitted, no real code changes
Revision 1.3 2000/10/27 14:57:16 jonas
+ implementation for tasmnode.getcopy
Revision 1.2 2000/10/14 21:52:54 peter
* fixed memory leaks
Revision 1.1 2000/10/14 10:14:50 peter
* moehrendorf oct 2000 rewrite
}
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