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{
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;
{$i fpcdefs.inc}
interface
uses
node;
type
tenumflowcontrol = (
fc_exit,
fc_break,
fc_continue,
fc_inflowcontrol,
fc_gotolabel,
{ in block that has an exception handler associated with it
(try..except, try..finally, exception block of try..except, ... }
fc_catching_exceptions,
{ in try block of try..finally and target uses specific unwinding }
fc_unwind_exit,
fc_unwind_loop,
{ the left side of an expression is already handled, so we are
not allowed to do ssl }
fc_lefthandled);
tflowcontrol = set of tenumflowcontrol;
var
flowcontrol : tflowcontrol;
{ produces the actual code }
function do_secondpass(var p : tnode) : boolean;
procedure secondpass(p : tnode);
implementation
uses
cutils,
globtype,verbose,
globals,
aasmdata,
cgobj
{$ifdef EXTDEBUG}
,cgbase
,aasmtai
{$endif}
;
{*****************************************************************************
SecondPass
*****************************************************************************}
{$ifdef EXTDEBUG}
var
secondprefix : string;
procedure logsecond(ht:tnodetype; entry: boolean);
const
secondnames: array[tnodetype] of string[13] =
('<emptynode>',
'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}
'deref', {derefn}
'addr', {addrn}
'ordconst', {ordconstn}
'typeconv', {typeconvn}
'calln', {calln}
'noth-callpar',{callparan}
'realconst', {realconstn}
'unaryminus', {unaryminusn}
'unaryplus', {unaryplusn}
'asm', {asmn}
'vecn', {vecn}
'pointerconst',{pointerconstn}
'stringconst', {stringconstn}
'not', {notn}
'inline', {inlinen}
'niln', {niln}
'error', {errorn}
'nothing-typen', {typen}
'setelement', {setelementn}
'setconst', {setconstn}
'blockn', {blockn}
'statement', {statementn}
'ifn', {ifn}
'breakn', {breakn}
'continuen', {continuen}
'while_repeat', {whilerepeatn}
'for', {forn}
'exitn', {exitn}
'case', {casen}
'label', {labeln}
'goto', {goton}
'tryexcept', {tryexceptn}
'raise', {raisen}
'tryfinally', {tryfinallyn}
'on', {onn}
'is', {isn}
'as', {asn}
'add-starstar', {starstarn}
'arrayconstruc', {arrayconstructn}
'noth-arrcnstr', {arrayconstructrangen}
'tempcreaten',
'temprefn',
'tempdeleten',
'addoptn',
'nothing-nothg', {nothingn}
'loadvmt', {loadvmtn}
'guidconstn',
'rttin',
'loadparentfpn',
'objselectorn',
'objcprotocoln',
'specializen'
);
var
p: pchar;
begin
if entry then
begin
secondprefix:=secondprefix+' ';
p := strpnew(secondprefix+'second '+secondnames[ht]+' (entry)')
end
else
begin
p := strpnew(secondprefix+'second '+secondnames[ht]+' (exit)');
delete(secondprefix,length(secondprefix),1);
end;
current_asmdata.CurrAsmList.concat(tai_comment.create(p));
end;
{$endif EXTDEBUG}
procedure secondpass(p : tnode);
var
oldcodegenerror : boolean;
oldlocalswitches : tlocalswitches;
oldpos : tfileposinfo;
begin
if not assigned(p) then
internalerror(200208221);
if not(nf_error in p.flags) then
begin
oldcodegenerror:=codegenerror;
oldlocalswitches:=current_settings.localswitches;
oldpos:=current_filepos;
current_filepos:=p.fileinfo;
current_settings.localswitches:=p.localswitches;
codegenerror:=false;
if assigned(p.optinfo) then
cg.executionweight:=min(p.optinfo^.executionweight,high(cg.executionweight))
else
cg.executionweight:=100;
{$ifdef EXTDEBUG}
if (p.expectloc=LOC_INVALID) then
Comment(V_Warning,'ExpectLoc is not set before secondpass: '+nodetype2str[p.nodetype]);
if (p.location.loc<>LOC_INVALID) then
Comment(V_Warning,'Location.Loc is already set before secondpass: '+nodetype2str[p.nodetype]);
if (cs_asm_nodes in current_settings.globalswitches) then
logsecond(p.nodetype,true);
{$endif EXTDEBUG}
p.pass_generate_code;
{$ifdef EXTDEBUG}
if (cs_asm_nodes in current_settings.globalswitches) then
logsecond(p.nodetype,false);
if (not codegenerror) then
begin
if (p.location.loc<>p.expectloc) then
begin
if ((p.location.loc=loc_register) and (p.expectloc=loc_cregister))
or ((p.location.loc=loc_fpuregister) and (p.expectloc=loc_cfpuregister))
or ((p.location.loc=loc_reference) and (p.expectloc=loc_creference)) then
Comment(V_Note,'Location ('+tcgloc2str[p.location.loc]+') not equal to expectloc ('+tcgloc2str[p.expectloc]+'): '+nodetype2str[p.nodetype])
else
Comment(V_Warning,'Location ('+tcgloc2str[p.location.loc]+') not equal to expectloc ('+tcgloc2str[p.expectloc]+'): '+nodetype2str[p.nodetype]);
end;
if (p.location.loc=LOC_INVALID) then
Comment(V_Warning,'Location not set in secondpass: '+nodetype2str[p.nodetype]);
end;
{$endif EXTDEBUG}
if codegenerror then
include(p.flags,nf_error);
codegenerror:=codegenerror or oldcodegenerror;
current_settings.localswitches:=oldlocalswitches;
current_filepos:=oldpos;
end
else
codegenerror:=true;
end;
function do_secondpass(var p : tnode) : boolean;
begin
{ current_asmdata.CurrAsmList must be empty }
if not current_asmdata.CurrAsmList.empty then
internalerror(200405201);
{ clear errors before starting }
codegenerror:=false;
if not(nf_error in p.flags) then
secondpass(p);
do_secondpass:=codegenerror;
end;
end.
|
