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{
Copyright (c) 1998-2002 by Florian Klaempfl
This unit handles the pass_typecheck and node conversion 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_1;
{$i fpcdefs.inc}
interface
uses
node;
procedure typecheckpass(var p : tnode);
function do_typecheckpass(var p : tnode) : boolean;
function do_typecheckpass_changed(var p : tnode; out nodechanged: boolean) : boolean;
procedure firstpass(var p : tnode);
function do_firstpass(var p : tnode) : boolean;
{$ifdef state_tracking}
procedure do_track_state_pass(p:Tnode);
{$endif}
implementation
uses
globtype,comphook,
globals,
procinfo,
symdef
{$ifdef extdebug}
,verbose,htypechk
,cgbase
{$endif extdebug}
{$ifdef state_tracking}
,nstate
{$endif}
;
{*****************************************************************************
Global procedures
*****************************************************************************}
procedure typecheckpass_internal_loop(var p : tnode; out node_changed: boolean);
var
hp : tnode;
oldflags : tnodeflags;
begin
codegenerror:=false;
repeat
current_filepos:=p.fileinfo;
current_settings.localswitches:=p.localswitches;
status.verbosity:=p.verbosity;
hp:=p.pass_typecheck;
{ should the node be replaced? }
if assigned(hp) then
begin
node_changed:=true;
oldflags:=p.flags;
p.free;
{ switch to new node }
p:=hp;
{ transfer generic paramter flag }
if nf_generic_para in oldflags then
include(p.flags,nf_generic_para);
end;
until not assigned(hp) or
assigned(hp.resultdef);
if codegenerror then
begin
include(p.flags,nf_error);
{ default to errortype if no type is set yet }
if p.resultdef=nil then
p.resultdef:=generrordef;
end;
end;
procedure typecheckpass_internal(var p : tnode; out node_changed: boolean);
var
oldcodegenerror : boolean;
oldlocalswitches : tlocalswitches;
oldverbosity : longint;
oldpos : tfileposinfo;
begin
node_changed:=false;
if (p.resultdef=nil) then
begin
oldcodegenerror:=codegenerror;
oldpos:=current_filepos;
oldlocalswitches:=current_settings.localswitches;
oldverbosity:=status.verbosity;
typecheckpass_internal_loop(p, node_changed);
current_settings.localswitches:=oldlocalswitches;
current_filepos:=oldpos;
status.verbosity:=oldverbosity;
codegenerror:=codegenerror or oldcodegenerror;
end
else
begin
{ update the codegenerror boolean with the previous result of this node }
if (nf_error in p.flags) then
codegenerror:=true;
end;
end;
procedure typecheckpass(var p : tnode);
var
node_changed: boolean;
begin
typecheckpass_internal(p,node_changed);
end;
function do_typecheckpass_changed(var p : tnode; out nodechanged: boolean) : boolean;
begin
codegenerror:=false;
typecheckpass_internal(p,nodechanged);
do_typecheckpass_changed:=codegenerror;
end;
function do_typecheckpass(var p : tnode) : boolean;
var
nodechanged: boolean;
begin
result:=do_typecheckpass_changed(p,nodechanged);
end;
procedure firstpass(var p : tnode);
var
oldcodegenerror : boolean;
oldlocalswitches : tlocalswitches;
oldpos : tfileposinfo;
oldverbosity: longint;
hp : tnode;
nodechanged : boolean;
begin
if (nf_pass1_done in p.flags) then
exit;
if not(nf_error in p.flags) then
begin
oldcodegenerror:=codegenerror;
oldpos:=current_filepos;
oldlocalswitches:=current_settings.localswitches;
oldverbosity:=status.verbosity;
codegenerror:=false;
repeat
{ checks make always a call }
if ([cs_check_range,cs_check_overflow,cs_check_stack] * current_settings.localswitches <> []) then
include(current_procinfo.flags,pi_do_call);
{ determine the resultdef if not done }
if (p.resultdef=nil) then
begin
typecheckpass_internal_loop(p,nodechanged);
end;
hp:=nil;
if not(nf_error in p.flags) then
begin
current_filepos:=p.fileinfo;
current_settings.localswitches:=p.localswitches;
status.verbosity:=p.verbosity;
{ first pass }
hp:=p.pass_1;
{ inlining happens in pass_1 and can cause new }
{ simplify opportunities }
if not assigned(hp) then
hp:=p.simplify(true);
{ should the node be replaced? }
if assigned(hp) then
begin
p.free;
{ switch to new node }
p:=hp;
end;
if codegenerror then
include(p.flags,nf_error);
end;
until not assigned(hp) or
(nf_pass1_done in hp.flags);
include(p.flags,nf_pass1_done);
{$ifdef EXTDEBUG}
if not(nf_error in p.flags) then
begin
if (p.expectloc=LOC_INVALID) then
Comment(V_Warning,'Expectloc is not set in firstpass: '+nodetype2str[p.nodetype]);
end;
{$endif EXTDEBUG}
codegenerror:=codegenerror or oldcodegenerror;
current_settings.localswitches:=oldlocalswitches;
current_filepos:=oldpos;
status.verbosity:=oldverbosity;
end
else
codegenerror:=true;
end;
function do_firstpass(var p : tnode) : boolean;
begin
codegenerror:=false;
firstpass(p);
{$ifdef state_tracking}
writeln('TRACKSTART');
writeln('before');
writenode(p);
do_track_state_pass(p);
writeln('after');
writenode(p);
writeln('TRACKDONE');
{$endif}
do_firstpass:=codegenerror;
end;
{$ifdef state_tracking}
procedure do_track_state_pass(p:Tnode);
begin
aktstate:=Tstate_storage.create;
p.track_state_pass(true);
aktstate.destroy;
end;
{$endif}
end.
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