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{
Copyright (c) 2011 by Jonas Maebe
Generates nodes for typed constant declarations
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 njvmtcon;
{$i fpcdefs.inc}
interface
uses
globtype,
node,
symtype,symdef,
ngtcon;
type
tarrstringdata = record
arrstring: ansistring;
arrdatastart, arrdatalen: asizeint;
arraybase: tnode;
end;
tjvmtypedconstbuilder = class(tnodetreetypedconstbuilder)
private
procedure tc_flush_arr_strconst(def: tdef);
procedure tc_emit_arr_strconst_ele(val: int64; def: torddef);
protected
arrstringdata: tarrstringdata;
parsingordarray: boolean;
procedure parse_arraydef(def: tarraydef); override;
procedure tc_emit_setdef(def: tsetdef; var node: tnode);override;
procedure tc_emit_orddef(def: torddef; var node: tnode); override;
end;
implementation
uses
globals,widestr,verbose,constexp,
tokens,scanner,pexpr,
defutil,
nbas,ncal,ncon,ncnv,njvmcon;
procedure init_arrstringdata(out data: tarrstringdata);
begin
data.arrstring:='';
data.arrdatastart:=0;
data.arrdatalen:=0;
data.arraybase:=nil;
end;
procedure tjvmtypedconstbuilder.tc_flush_arr_strconst(def: tdef);
var
wstr: pcompilerwidestring;
wc: tcompilerwidechar;
i: longint;
procvariant: string[8];
begin
// convert ansistring to packed unicodestring
initwidestring(wstr);
for i:=1 to length(arrstringdata.arrstring) div 2 do
begin
wc:=tcompilerwidechar(ord(arrstringdata.arrstring[i*2-1]) shl 8 or
ord(arrstringdata.arrstring[i*2]));
concatwidestringchar(wstr,wc);
end;
if odd(length(arrstringdata.arrstring)) then
concatwidestringchar(wstr,
tcompilerwidechar(ord(arrstringdata.arrstring[length(arrstringdata.arrstring)]) shl 8));
if is_char(def) then
procvariant:='ansichar'
else if is_signed(def) then
case def.size of
1: procvariant:='shortint';
2: procvariant:='smallint';
4: procvariant:='longint';
8: procvariant:='int64';
else
internalerror(2011111301);
end
else
case def.size of
1: procvariant:='byte';
2: procvariant:='word';
4: procvariant:='cardinal';
8: procvariant:='qword';
else
internalerror(2011111302);
end;
// (const s: unicodestring; var arr: array of shortint; startintdex, len: longint);
addstatement(statmnt,ccallnode.createintern('fpc_tcon_'+procvariant+'_array_from_string',
ccallparanode.create(genintconstnode(arrstringdata.arrdatalen),
ccallparanode.create(genintconstnode(arrstringdata.arrdatastart),
ccallparanode.create(arrstringdata.arraybase.getcopy,
ccallparanode.create(cstringconstnode.createunistr(wstr),nil))))));
inc(arrstringdata.arrdatastart,arrstringdata.arrdatalen);
arrstringdata.arrstring:='';
arrstringdata.arrdatalen:=0;
donewidestring(wstr);
end;
procedure tjvmtypedconstbuilder.tc_emit_arr_strconst_ele(val: int64; def: torddef);
var
elesize: longint;
begin
elesize:=def.size;
inc(arrstringdata.arrdatalen);
case elesize of
1:
arrstringdata.arrstring:=arrstringdata.arrstring+char(val);
2:
arrstringdata.arrstring:=arrstringdata.arrstring+char(val shr 8)+char(val and $ff);
4:
arrstringdata.arrstring:=arrstringdata.arrstring+char((val shr 24))+
char((val shr 16) and $ff)+
char((val shr 8) and $ff)+
char(val and $ff);
8:
arrstringdata.arrstring:=arrstringdata.arrstring+char((val shr 56))+
char((val shr 48) and $ff)+
char((val shr 40) and $ff)+
char((val shr 32) and $ff)+
char((val shr 24) and $ff)+
char((val shr 16) and $ff)+
char((val shr 8) and $ff)+
char(val and $ff);
end;
{ we can't use the full 64kb, because inside the Java class file the
string constant is actually encoded using UTF-8 and it's this UTF-8
encoding that has to fit inside 64kb (and utf-8 encoding of random
data can easily blow up its size by about a third) }
if length(arrstringdata.arrstring)>40000 then
tc_flush_arr_strconst(def);
end;
procedure tjvmtypedconstbuilder.parse_arraydef(def: tarraydef);
var
n: tnode;
i, len: longint;
ca: pbyte;
ch: array[0..1] of char;
old_arrstringdata: tarrstringdata;
old_parsingordarray: boolean;
begin
if is_dynamic_array(def) or
(not is_char(def.elementdef) and
(not is_integer(def.elementdef) or
not(ts_compact_int_array_init in current_settings.targetswitches))) then
begin
inherited;
exit;
end;
old_arrstringdata:=arrstringdata;
init_arrstringdata(arrstringdata);
arrstringdata.arraybase:=basenode.getcopy;
old_parsingordarray:=parsingordarray;
parsingordarray:=true;
if (token=_LKLAMMER) or
not is_char(def.elementdef) then
inherited
else
begin
{ array of ansichar -> can be constant char/string; can't use plain
assignment in this case, because it will result in a codepage
conversion }
n:=comp_expr([ef_accept_equal]);
if n.nodetype=stringconstn then
begin
len:=tstringconstnode(n).len;
if (tstringconstnode(n).cst_type in [cst_unicodestring,cst_widestring]) then
inserttypeconv(n,getansistringdef);
if n.nodetype<>stringconstn then
internalerror(2010033010);
ca:=pbyte(tstringconstnode(n).value_str);
{ For tp7 the maximum lentgh can be 255 }
if (m_tp7 in current_settings.modeswitches) and
(len>255) then
len:=255;
end
else if is_constcharnode(n) then
begin
ch[0]:=chr(tordconstnode(n).value.uvalue and $ff);
ca:=@ch;
len:=1;
end
else if is_constwidecharnode(n) and (current_settings.sourcecodepage<>CP_UTF8) then
begin
inserttypeconv(n,cansichartype);
if not is_constcharnode(n) then
internalerror(2010033007);
ch[0]:=chr(tordconstnode(n).value.uvalue and $ff);
ca:=@ch;
len:=1;
end
else
begin
Message(parser_e_illegal_expression);
len:=0;
{ avoid crash later on }
ch[0]:=#0;
ca:=@ch;
end;
if len>(def.highrange-def.lowrange+1) then
Message(parser_e_string_larger_array);
for i:=0 to def.highrange-def.lowrange do
begin
if i<len then
begin
tc_emit_arr_strconst_ele(pbyte(ca)^,torddef(cansichartype));
inc(ca);
end
else
{Fill the remaining positions with #0.}
tc_emit_arr_strconst_ele(0,torddef(cansichartype));
end;
n.free;
end;
if length(arrstringdata.arrstring)<>0 then
tc_flush_arr_strconst(def.elementdef);
arrstringdata.arraybase.free;
parsingordarray:=old_parsingordarray;
arrstringdata:=old_arrstringdata;
end;
procedure tjvmtypedconstbuilder.tc_emit_setdef(def: tsetdef; var node: tnode);
begin
{ indicate that set constant nodes have to be transformed into
constructors here }
if node.nodetype=setconstn then
tjvmsetconstnode(node).setconsttype:=sct_construct;
inherited tc_emit_setdef(def,node);
end;
procedure tjvmtypedconstbuilder.tc_emit_orddef(def: torddef; var node: tnode);
begin
if not parsingordarray then
begin
inherited;
exit;
end;
if node.nodetype<>ordconstn then
internalerror(2011111101);
tc_emit_arr_strconst_ele(tordconstnode(node).value.svalue,def);
basenode.free;
basenode:=nil;
node.free;
node:=nil;
end;
begin
ctypedconstbuilder:=tjvmtypedconstbuilder;
end.
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