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fpc/compiler/pass_2.pas
daniel 399036f1c2 * State tracker work 
* The whilen and repeatn are now completely unified into whilerepeatn. This
  allows the state tracker to change while nodes automatically into
  repeat nodes.
* Resulttypepass improvements to the notn. 'not not a' is optimized away and
  'not(a>b)' is optimized into 'a<=b'.
* Resulttypepass improvements to the whilerepeatn. 'while not a' is optimized
  by removing the notn and later switchting the true and falselabels. The
  same is done with 'repeat until not a'.
2002-07-19 11:41:34 +00:00

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{
$Id$
Copyright (c) 1998-2002 by Florian Klaempfl
This unit handles the codegeneration pass
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 pass_2;
{$i fpcdefs.inc}
interface
uses
node;
type
tenumflowcontrol = (fc_exit,fc_break,fc_continue);
tflowcontrol = set of tenumflowcontrol;
var
flowcontrol : tflowcontrol;
{ produces assembler for the expression in variable p }
{ and produces an assembler node at the end }
procedure generatecode(var p : tnode);
{ produces the actual code }
function do_secondpass(var p : tnode) : boolean;
procedure secondpass(var p : tnode);
implementation
uses
{$ifdef EXTDEBUG}
cutils,
{$endif}
globtype,systems,verbose,
cclasses,globals,
symconst,symbase,symtype,symsym,
aasmbase,aasmtai,
pass_1,cpubase,cgbase,regvars,nflw,rgobj;
{*****************************************************************************
SecondPass
*****************************************************************************}
{$ifdef EXTDEBUG}
procedure logsecond(ht:tnodetype; entry: boolean);
const
secondnames: array[tnodetype] of string[13] =
('add-addn', {addn}
'add-muln', {muln}
'add-subn', {subn}
'moddiv-divn', {divn}
'add-symdifn', {symdifn}
'moddiv-modn', {modn}
'assignment', {assignn}
'load', {loadn}
'nothing-range', {range}
'add-ltn', {ltn}
'add-lten', {lten}
'add-gtn', {gtn}
'add-gten', {gten}
'add-equaln', {equaln}
'add-unequaln', {unequaln}
'in', {inn}
'add-orn', {orn}
'add-xorn', {xorn}
'shlshr-shrn', {shrn}
'shlshr-shln', {shln}
'add-slashn', {slashn}
'add-andn', {andn}
'subscriptn', {subscriptn}
'dderef', {derefn}
'addr', {addrn}
'doubleaddr', {doubleaddrn}
'ordconst', {ordconstn}
'typeconv', {typeconvn}
'calln', {calln}
'noth-callpar', {callparan}
'realconst', {realconstn}
'unaryminus', {unaryminusn}
'asm', {asmn}
'vecn', {vecn}
'pointerconst', {pointerconstn}
'stringconst', {stringconstn}
'funcret', {funcretn}
'selfn', {selfn}
'not', {notn}
'inline', {inlinen}
'niln', {niln}
'error', {errorn}
'nothing-typen', {typen}
'hnewn', {hnewn}
'hdisposen', {hdisposen}
'setelement', {setelementn}
'setconst', {setconstn}
'blockn', {blockn}
'statement', {statementn}
'nothing-loopn', {loopn}
'ifn', {ifn}
'breakn', {breakn}
'continuen', {continuen}
(* '_while_REPEAT', {repeatn}
'_WHILE_repeat', {whilen}*)
'while_repeat', {whilerepeatn}
'for', {forn}
'exitn', {exitn}
'with', {withn}
'case', {casen}
'label', {labeln}
'goto', {goton}
'tryexcept', {tryexceptn}
'raise', {raisen}
'tryfinally', {tryfinallyn}
'on', {onn}
'is', {isn}
'as', {asn}
'error-caret', {caretn}
'fail', {failn}
'add-starstar', {starstarn}
'procinline', {procinlinen}
'arrayconstruc', {arrayconstructn}
'noth-arrcnstr', {arrayconstructrangen}
'tempn',
'temprefn',
'addoptn',
'nothing-nothg', {nothingn}
'loadvmt', {loadvmtn}
'guidconstn',
'rttin'
);
var
p: pchar;
begin
if entry then
p := strpnew('second'+secondnames[ht]+' (entry)')
else
p := strpnew('second'+secondnames[ht]+' (exit)');
exprasmlist.concat(tai_asm_comment.create(p));
end;
{$endif EXTDEBUG}
procedure secondpass(var p : tnode);
var
oldcodegenerror : boolean;
oldlocalswitches : tlocalswitches;
oldpos : tfileposinfo;
{$ifdef TEMPREGDEBUG}
prevp : pptree;
{$endif TEMPREGDEBUG}
{$ifdef EXTDEBUG}
oldloc : tloc;
{$endif EXTDEBUG}
begin
if not(nf_error in p.flags) then
begin
oldcodegenerror:=codegenerror;
oldlocalswitches:=aktlocalswitches;
oldpos:=aktfilepos;
{$ifdef TEMPREGDEBUG}
testregisters32;
prevp:=curptree;
curptree:=@p;
p^.usableregs:=usablereg32;
{$endif TEMPREGDEBUG}
aktfilepos:=p.fileinfo;
aktlocalswitches:=p.localswitches;
codegenerror:=false;
{$ifdef EXTDEBUG}
oldloc:=p.location.loc;
p.location.loc:=LOC_INVALID;
if (cs_asm_nodes in aktglobalswitches) then
logsecond(p.nodetype,true);
{$endif EXTDEBUG}
p.pass_2;
{$ifdef EXTDEBUG}
if (cs_asm_nodes in aktglobalswitches) then
logsecond(p.nodetype,false);
if (not codegenerror) and
(oldloc<>LOC_INVALID) and
(p.location.loc=LOC_INVALID) then
Comment(V_Fatal,'Location not set in secondpass: '+nodetype2str[p.nodetype]);
{$endif EXTDEBUG}
if codegenerror then
include(p.flags,nf_error);
codegenerror:=codegenerror or oldcodegenerror;
aktlocalswitches:=oldlocalswitches;
aktfilepos:=oldpos;
{$ifdef TEMPREGDEBUG}
curptree:=prevp;
{$endif TEMPREGDEBUG}
{$ifdef EXTTEMPREGDEBUG}
if p.usableregs-usablereg32>p.reallyusedregs then
p.reallyusedregs:=p.usableregs-usablereg32;
if p.reallyusedregs<p.registers32 then
Comment(V_Debug,'registers32 overestimated '+tostr(p^.registers32)+
'>'+tostr(p^.reallyusedregs));
{$endif EXTTEMPREGDEBUG}
end
else
codegenerror:=true;
end;
function do_secondpass(var p : tnode) : boolean;
begin
codegenerror:=false;
if not(nf_error in p.flags) then
secondpass(p);
do_secondpass:=codegenerror;
end;
procedure clearrefs(p : tnamedindexitem;arg:pointer);
begin
if (tsym(p).typ=varsym) then
if tvarsym(p).refs>1 then
tvarsym(p).refs:=1;
end;
procedure generatecode(var p : tnode);
begin
rg.cleartempgen;
flowcontrol:=[];
{ when size optimization only count occurrence }
if cs_littlesize in aktglobalswitches then
rg.t_times:=1
else
{ reference for repetition is 100 }
rg.t_times:=100;
{ clear register count }
rg.clearregistercount;
use_esp_stackframe:=false;
symtablestack.foreach_static({$ifdef FPCPROCVAR}@{$endif}clearrefs,nil);
symtablestack.next.foreach_static({$ifdef FPCPROCVAR}@{$endif}clearrefs,nil);
{ firstpass everything }
do_firstpass(p);
{ only do secondpass if there are no errors }
if ErrorCount=0 then
begin
{$ifdef OMITSTACKFRAME}
if (cs_regalloc in aktglobalswitches) and
((procinfo^.flags and (pi_uses_asm or pi_uses_exceptions))=0) then
begin
{ can we omit the stack frame ? }
{ conditions:
1. procedure (not main block)
2. no constructor or destructor
3. no call to other procedures
4. no interrupt handler
}
{!!!!!! this doesn work yet, because of problems with
with linux and windows
}
(*
if assigned(aktprocsym) then
begin
if not(assigned(procinfo^._class)) and
not(aktprocdef.proctypeoption in [potype_constructor,potype_destructor]) and
not(po_interrupt in aktprocdef.procoptions) and
((procinfo^.flags and pi_do_call)=0) and
(lexlevel>=normal_function_level) then
begin
{ use ESP as frame pointer }
procinfo^.framepointer:=STACK_POINTER_REG;
use_esp_stackframe:=true;
{ calc parameter distance new }
dec(procinfo^.framepointer_offset,4);
dec(procinfo^.selfpointer_offset,4);
{ is this correct ???}
{ retoffset can be negativ for results in eax !! }
{ the value should be decreased only if positive }
if procinfo^.retoffset>=0 then
dec(procinfo^.retoffset,4);
dec(procinfo^.para_offset,4);
aktprocdef.parast.address_fixup:=procinfo^.para_offset;
end;
end;
*)
end;
{$endif OMITSTACKFRAME}
{ process register variable stuff (JM) }
assign_regvars(p);
load_regvars(procinfo^.aktentrycode,p);
{ for the i386 it must be done in genexitcode because it has }
{ to add 'fstp' instructions when using fpu regvars and those }
{ must come after the "exitlabel" (JM) }
{$ifndef i386}
cleanup_regvars(procinfo^.aktexitcode);
{$endif i386}
do_secondpass(p);
if assigned(procinfo^.procdef) then
procinfo^.procdef.fpu_used:=p.registersfpu;
end;
procinfo^.aktproccode.concatlist(exprasmlist);
end;
end.
{
$Log$
Revision 1.32 2002-07-19 11:41:36 daniel
* State tracker work
* The whilen and repeatn are now completely unified into whilerepeatn. This
allows the state tracker to change while nodes automatically into
repeat nodes.
* Resulttypepass improvements to the notn. 'not not a' is optimized away and
'not(a>b)' is optimized into 'a<=b'.
* Resulttypepass improvements to the whilerepeatn. 'while not a' is optimized
by removing the notn and later switchting the true and falselabels. The
same is done with 'repeat until not a'.
Revision 1.31 2002/07/01 18:46:25 peter
* internal linker
* reorganized aasm layer
Revision 1.30 2002/05/18 13:34:11 peter
* readded missing revisions
Revision 1.29 2002/05/16 19:46:42 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 1.27 2002/05/12 16:53:08 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 1.26 2002/04/21 19:02:04 peter
* removed newn and disposen nodes, the code is now directly
inlined from pexpr
* -an option that will write the secondpass nodes to the .s file, this
requires EXTDEBUG define to actually write the info
* fixed various internal errors and crashes due recent code changes
Revision 1.25 2002/04/20 21:32:24 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 1.24 2002/04/07 13:30:13 carl
- removed unused variable
Revision 1.23 2002/04/02 17:11:29 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 1.22 2002/03/31 20:26:35 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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