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|
{
Copyright (c) 1998-2011 by Florian Klaempfl, Jonas Maebe
Generates code/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 ngtcon;
{$i fpcdefs.inc}
interface
uses
globtype,
aasmdata,
node,nbas,
symtype, symbase, symdef,symsym;
type
ttypedconstbuilder = class
protected
current_old_block_type : tblock_type;
tcsym: tstaticvarsym;
{ this procedure reads typed constants }
procedure read_typed_const_data(def:tdef);
procedure parse_orddef(def: torddef);
procedure parse_floatdef(def: tfloatdef);
procedure parse_classrefdef(def: tclassrefdef);
procedure parse_pointerdef(def: tpointerdef);
procedure parse_setdef(def: tsetdef);
procedure parse_enumdef(def: tenumdef);
procedure parse_stringdef(def: tstringdef);
procedure parse_arraydef(def:tarraydef);virtual;abstract;
procedure parse_procvardef(def:tprocvardef);virtual;abstract;
procedure parse_recorddef(def:trecorddef);virtual;abstract;
procedure parse_objectdef(def:tobjectdef);virtual;abstract;
procedure tc_emit_orddef(def: torddef; var node: tnode);virtual;abstract;
procedure tc_emit_floatdef(def: tfloatdef; var node: tnode);virtual;abstract;
procedure tc_emit_classrefdef(def: tclassrefdef; var node: tnode);virtual;abstract;
procedure tc_emit_pointerdef(def: tpointerdef; var node: tnode);virtual;abstract;
procedure tc_emit_setdef(def: tsetdef; var node: tnode);virtual;abstract;
procedure tc_emit_enumdef(def: tenumdef; var node: tnode);virtual;abstract;
procedure tc_emit_stringdef(def: tstringdef; var node: tnode);virtual;abstract;
public
constructor create(sym: tstaticvarsym);
end;
ttypedconstbuilderclass = class of ttypedconstbuilder;
{ should be changed into nested type of tasmlisttypedconstbuilder when
possible }
tbitpackedval = record
curval, nextval: aword;
curbitoffset: smallint;
loadbitsize,packedbitsize: byte;
end;
tasmlisttypedconstbuilder = class(ttypedconstbuilder)
private
curoffset: asizeint;
function parse_single_packed_const(def: tdef; var bp: tbitpackedval): boolean;
protected
list: tasmlist;
procedure parse_packed_array_def(def: tarraydef);
procedure parse_arraydef(def:tarraydef);override;
procedure parse_procvardef(def:tprocvardef);override;
procedure parse_recorddef(def:trecorddef);override;
procedure parse_objectdef(def:tobjectdef);override;
procedure tc_emit_orddef(def: torddef; var node: tnode);override;
procedure tc_emit_floatdef(def: tfloatdef; var node: tnode); override;
procedure tc_emit_classrefdef(def: tclassrefdef; var node: tnode);override;
procedure tc_emit_pointerdef(def: tpointerdef; var node: tnode);override;
procedure tc_emit_setdef(def: tsetdef; var node: tnode);override;
procedure tc_emit_enumdef(def: tenumdef; var node: tnode);override;
procedure tc_emit_stringdef(def: tstringdef; var node: tnode);override;
public
constructor create(sym: tstaticvarsym);virtual;
function parse_into_asmlist: tasmlist;
end;
tasmlisttypedconstbuilderclass = class of tasmlisttypedconstbuilder;
tnodetreetypedconstbuilder = class(ttypedconstbuilder)
protected
resultblock: tblocknode;
statmnt: tstatementnode;
{ when parsing a record, the base nade becomes a loadnode of the record,
etc. }
basenode: tnode;
procedure parse_arraydef(def:tarraydef);override;
procedure parse_procvardef(def:tprocvardef);override;
procedure parse_recorddef(def:trecorddef);override;
procedure parse_objectdef(def:tobjectdef);override;
procedure tc_emit_orddef(def: torddef; var node: tnode);override;
procedure tc_emit_floatdef(def: tfloatdef; var node: tnode); override;
procedure tc_emit_classrefdef(def: tclassrefdef; var node: tnode);override;
procedure tc_emit_pointerdef(def: tpointerdef; var node: tnode);override;
procedure tc_emit_setdef(def: tsetdef; var node: tnode);override;
procedure tc_emit_enumdef(def: tenumdef; var node: tnode);override;
procedure tc_emit_stringdef(def: tstringdef; var node: tnode);override;
public
constructor create(sym: tstaticvarsym; previnit: tnode);virtual;
destructor destroy;override;
function parse_into_nodetree: tnode;
end;
tnodetreetypedconstbuilderclass = class of tnodetreetypedconstbuilder;
var
ctypedconstbuilder: ttypedconstbuilderclass;
implementation
uses
SysUtils,
cclasses,systems,tokens,verbose,constexp,
cutils,globals,widestr,scanner,
symconst,symtable,
aasmbase,aasmtai,aasmcpu,defutil,defcmp,
{ pass 1 }
htypechk,procinfo,
nmat,nadd,ncal,nmem,nset,ncnv,ninl,ncon,nld,nflw,
{ parser specific stuff }
pbase,pexpr,pdecvar,
{ codegen }
cpuinfo,cgbase,dbgbase,
wpobase,asmutils
;
{$maxfpuregisters 0}
function get_next_varsym(def: tabstractrecorddef; const SymList:TFPHashObjectList; var symidx:longint):tsym;inline;
begin
while symidx<SymList.Count do
begin
result:=tsym(def.symtable.SymList[symidx]);
inc(symidx);
if result.typ=fieldvarsym then
exit;
end;
result:=nil;
end;
{*****************************************************************************
read typed const
*****************************************************************************}
procedure ttypedconstbuilder.parse_orddef(def:torddef);
var
n : tnode;
begin
n:=comp_expr(true,false);
{ for C-style booleans, true=-1 and false=0) }
if is_cbool(def) then
inserttypeconv(n,def);
tc_emit_orddef(def,n);
n.free;
end;
procedure ttypedconstbuilder.parse_floatdef(def:tfloatdef);
var
n : tnode;
begin
n:=comp_expr(true,false);
tc_emit_floatdef(def,n);
n.free;
end;
procedure ttypedconstbuilder.parse_classrefdef(def:tclassrefdef);
var
n : tnode;
begin
n:=comp_expr(true,false);
case n.nodetype of
loadvmtaddrn:
begin
{ update wpo info }
if not assigned(current_procinfo) or
(po_inline in current_procinfo.procdef.procoptions) or
wpoinfomanager.symbol_live(current_procinfo.procdef.mangledname) then
tobjectdef(tclassrefdef(n.resultdef).pointeddef).register_maybe_created_object_type;
end;
end;
tc_emit_classrefdef(def,n);
n.free;
end;
procedure ttypedconstbuilder.parse_pointerdef(def:tpointerdef);
var
p: tnode;
begin
p:=comp_expr(true,false);
tc_emit_pointerdef(def,p);
p.free;
end;
procedure ttypedconstbuilder.parse_setdef(def:tsetdef);
var
p : tnode;
begin
p:=comp_expr(true,false);
tc_emit_setdef(def,p);
p.free;
end;
procedure ttypedconstbuilder.parse_enumdef(def:tenumdef);
var
p : tnode;
begin
p:=comp_expr(true,false);
tc_emit_enumdef(def,p);
p.free;
end;
procedure ttypedconstbuilder.parse_stringdef(def:tstringdef);
var
n : tnode;
begin
n:=comp_expr(true,false);
tc_emit_stringdef(def,n);
n.free;
end;
{ ttypedconstbuilder }
procedure ttypedconstbuilder.read_typed_const_data(def:tdef);
var
prev_old_block_type,
old_block_type: tblock_type;
begin
old_block_type:=block_type;
prev_old_block_type:=current_old_block_type;
current_old_block_type:=old_block_type;
block_type:=bt_const;
case def.typ of
orddef :
parse_orddef(torddef(def));
floatdef :
parse_floatdef(tfloatdef(def));
classrefdef :
parse_classrefdef(tclassrefdef(def));
pointerdef :
parse_pointerdef(tpointerdef(def));
setdef :
parse_setdef(tsetdef(def));
enumdef :
parse_enumdef(tenumdef(def));
stringdef :
parse_stringdef(tstringdef(def));
arraydef :
parse_arraydef(tarraydef(def));
procvardef:
parse_procvardef(tprocvardef(def));
recorddef:
parse_recorddef(trecorddef(def));
objectdef:
parse_objectdef(tobjectdef(def));
errordef:
begin
{ try to consume something useful }
if token=_LKLAMMER then
consume_all_until(_RKLAMMER)
else
consume_all_until(_SEMICOLON);
end;
else
Message(parser_e_type_const_not_possible);
end;
block_type:=old_block_type;
current_old_block_type:=prev_old_block_type;
end;
constructor ttypedconstbuilder.create(sym: tstaticvarsym);
begin
tcsym:=sym;
end;
{*****************************************************************************
Bitpacked value helpers
*****************************************************************************}
procedure initbitpackval(out bp: tbitpackedval; packedbitsize: byte);
begin
bp.curval:=0;
bp.nextval:=0;
bp.curbitoffset:=0;
bp.packedbitsize:=packedbitsize;
bp.loadbitsize:=packedbitsloadsize(bp.packedbitsize)*8;
end;
{$push}
{$r-}
{$q-}
{ (values between quotes below refer to fields of bp; fields not }
{ mentioned are unused by this routine) }
{ bitpacks "value" as bitpacked value of bitsize "packedbitsize" into }
{ "curval", which has already been filled up to "curbitoffset", and }
{ stores the spillover if any into "nextval". It also updates }
{ curbitoffset to reflect how many bits of currval are now used (can be }
{ > AIntBits in case of spillover) }
procedure bitpackval(value: aword; var bp: tbitpackedval);
var
shiftcount: longint;
begin
if (target_info.endian=endian_big) then
begin
{ bitpacked format: left-aligned (i.e., "big endian bitness") }
bp.curval:=bp.curval or ((value shl (AIntBits-bp.packedbitsize)) shr bp.curbitoffset);
shiftcount:=((AIntBits-bp.packedbitsize)-bp.curbitoffset);
{ carry-over to the next element? }
if (shiftcount<0) then
bp.nextval:=(value and ((aword(1) shl (-shiftcount))-1)) shl
(AIntBits+shiftcount)
end
else
begin
{ bitpacked format: right aligned (i.e., "little endian bitness") }
bp.curval:=bp.curval or (value shl bp.curbitoffset);
{ carry-over to the next element? }
if (bp.curbitoffset+bp.packedbitsize>AIntBits) then
bp.nextval:=value shr (AIntBits-bp.curbitoffset)
end;
inc(bp.curbitoffset,bp.packedbitsize);
end;
procedure flush_packed_value(list: tasmlist; var bp: tbitpackedval);
var
bitstowrite: longint;
writeval : AInt;
begin
if (bp.curbitoffset < AIntBits) then
begin
{ forced flush -> write multiple of loadsize }
bitstowrite:=align(bp.curbitoffset,bp.loadbitsize);
bp.curbitoffset:=0;
end
else
begin
bitstowrite:=AIntBits;
dec(bp.curbitoffset,AIntBits);
end;
while (bitstowrite>=bp.loadbitsize) do
begin
if (target_info.endian=endian_little) then
begin
{ write lowest "loadbitsize" bits }
writeval:=bp.curval and (aint(-1) shr ((sizeof(aint)*8)-bp.loadbitsize));
bp.curval:=bp.curval shr bp.loadbitsize;
end
else
begin
{ write highest "loadbitsize" bits }
writeval:=bp.curval shr (AIntBits-bp.loadbitsize);
bp.curval:=bp.curval shl bp.loadbitsize;
end;
case bp.loadbitsize of
8: list.concat(tai_const.create_8bit(writeval));
16: list.concat(tai_const.create_16bit(writeval));
32: list.concat(tai_const.create_32bit(writeval));
64: list.concat(tai_const.create_64bit(writeval));
else
internalerror(2013111101);
end;
dec(bitstowrite,bp.loadbitsize);
end;
bp.curval:=bp.nextval;
bp.nextval:=0;
end;
{$pop}
{ parses a packed array constant }
procedure tasmlisttypedconstbuilder.parse_packed_array_def(def: tarraydef);
var
i : aint;
bp : tbitpackedval;
begin
if not(def.elementdef.typ in [orddef,enumdef]) then
internalerror(2007022010);
{ begin of the array }
consume(_LKLAMMER);
initbitpackval(bp,def.elepackedbitsize);
i:=def.lowrange;
{ can't use for-loop, fails when cross-compiling from }
{ 32 to 64 bit because i is then 64 bit }
while (i<def.highrange) do
begin
{ get next item of the packed array }
if not parse_single_packed_const(def.elementdef,bp) then
exit;
consume(_COMMA);
inc(i);
end;
{ final item }
if not parse_single_packed_const(def.elementdef,bp) then
exit;
{ flush final incomplete value if necessary }
if (bp.curbitoffset <> 0) then
flush_packed_value(list,bp);
consume(_RKLAMMER);
end;
constructor tasmlisttypedconstbuilder.create(sym: tstaticvarsym);
begin
inherited;
list:=tasmlist.create;
curoffset:=0;
end;
procedure tasmlisttypedconstbuilder.tc_emit_stringdef(def: tstringdef; var node: tnode);
var
strlength : aint;
strval : pchar;
strch : char;
ll : tasmlabofs;
ca : pchar;
winlike : boolean;
hsym : tconstsym;
begin
strval:='';
{ load strval and strlength of the constant tree }
if (node.nodetype=stringconstn) or is_wide_or_unicode_string(def) or is_constwidecharnode(node) or
((node.nodetype=typen) and is_interfacecorba(ttypenode(node).typedef)) then
begin
{ convert to the expected string type so that
for widestrings strval is a pcompilerwidestring }
inserttypeconv(node,def);
if (not codegenerror) and
(node.nodetype=stringconstn) then
begin
strlength:=tstringconstnode(node).len;
strval:=tstringconstnode(node).value_str;
{ the def may have changed from e.g. RawByteString to
AnsiString(CP_ACP) }
if node.resultdef.typ=stringdef then
def:=tstringdef(node.resultdef)
else
internalerror(2014010501);
end
else
begin
{ an error occurred trying to convert the result to a string }
strlength:=-1;
{ it's possible that the type conversion could not be
evaluated at compile-time }
if not codegenerror then
CGMessage(parser_e_widestring_to_ansi_compile_time);
end;
end
else if is_constcharnode(node) then
begin
{ strval:=pchar(@tordconstnode(node).value);
THIS FAIL on BIG_ENDIAN MACHINES PM }
strch:=chr(tordconstnode(node).value.svalue and $ff);
strval:=@strch;
strlength:=1
end
else if is_constresourcestringnode(node) then
begin
hsym:=tconstsym(tloadnode(node).symtableentry);
strval:=pchar(hsym.value.valueptr);
strlength:=hsym.value.len;
{ Delphi-compatible (mis)feature:
Link AnsiString constants to their initializing resourcestring,
enabling them to be (re)translated at runtime.
Wide/UnicodeString are currently rejected above (with incorrect error message).
ShortStrings cannot be handled unless another table is built for them;
considering this acceptable, because Delphi rejects them altogether.
}
if (not is_shortstring(def)) and
((tcsym.owner.symtablelevel<=main_program_level) or
(current_old_block_type=bt_const)) then
begin
current_asmdata.ResStrInits.Concat(
TTCInitItem.Create(tcsym,curoffset,
current_asmdata.RefAsmSymbol(make_mangledname('RESSTR',hsym.owner,hsym.name),AT_DATA))
);
Include(tcsym.varoptions,vo_force_finalize);
end;
end
else
begin
Message(parser_e_illegal_expression);
strlength:=-1;
end;
if strlength>=0 then
begin
case def.stringtype of
st_shortstring:
begin
if strlength>=def.size then
begin
message2(parser_w_string_too_long,strpas(strval),tostr(def.size-1));
strlength:=def.size-1;
end;
list.concat(Tai_const.Create_8bit(strlength));
{ this can also handle longer strings }
getmem(ca,strlength+1);
move(strval^,ca^,strlength);
ca[strlength]:=#0;
list.concat(Tai_string.Create_pchar(ca,strlength));
{ fillup with spaces if size is shorter }
if def.size>strlength then
begin
getmem(ca,def.size-strlength);
{ def.size contains also the leading length, so we }
{ we have to subtract one }
fillchar(ca[0],def.size-strlength-1,' ');
ca[def.size-strlength-1]:=#0;
{ this can also handle longer strings }
list.concat(Tai_string.Create_pchar(ca,def.size-strlength-1));
end;
end;
st_ansistring:
begin
{ an empty ansi string is nil! }
if (strlength=0) then
begin
ll.lab:=nil;
ll.ofs:=0;
end
else
ll:=emit_ansistring_const(current_asmdata.asmlists[al_const],strval,strlength,def.encoding);
list.concat(Tai_const.Create_sym_offset(ll.lab,ll.ofs));
end;
st_unicodestring,
st_widestring:
begin
{ an empty wide/unicode string is nil! }
if (strlength=0) then
begin
ll.lab:=nil;
ll.ofs:=0;
end
else
begin
winlike:=(def.stringtype=st_widestring) and (tf_winlikewidestring in target_info.flags);
ll:=emit_unicodestring_const(current_asmdata.asmlists[al_const],
strval,
def.encoding,
winlike);
{ Collect Windows widestrings that need initialization at startup.
Local initialized vars are excluded because they are initialized
at function entry instead. }
if winlike and
((tcsym.owner.symtablelevel<=main_program_level) or
(current_old_block_type=bt_const)) then
begin
if ll.ofs<>0 then
internalerror(2012051704);
current_asmdata.WideInits.Concat(
TTCInitItem.Create(tcsym,curoffset,ll.lab)
);
ll.lab:=nil;
ll.ofs:=0;
Include(tcsym.varoptions,vo_force_finalize);
end;
end;
list.concat(Tai_const.Create_sym_offset(ll.lab,ll.ofs));
end;
else
internalerror(200107081);
end;
end;
end;
procedure tasmlisttypedconstbuilder.tc_emit_orddef(def: torddef; var node: tnode);
var
intvalue: tconstexprint;
procedure do_error;
begin
if is_constnode(node) then
IncompatibleTypes(node.resultdef, def)
else if not(parse_generic) then
Message(parser_e_illegal_expression);
end;
begin
case def.ordtype of
pasbool8,
bool8bit :
begin
if is_constboolnode(node) then
begin
testrange(def,tordconstnode(node).value,false,false);
list.concat(Tai_const.Create_8bit(byte(tordconstnode(node).value.svalue)))
end
else
do_error;
end;
pasbool16,
bool16bit :
begin
if is_constboolnode(node) then
begin
testrange(def,tordconstnode(node).value,false,false);
list.concat(Tai_const.Create_16bit(word(tordconstnode(node).value.svalue)))
end
else
do_error;
end;
pasbool32,
bool32bit :
begin
if is_constboolnode(node) then
begin
testrange(def,tordconstnode(node).value,false,false);
list.concat(Tai_const.Create_32bit(longint(tordconstnode(node).value.svalue)))
end
else
do_error;
end;
pasbool64,
bool64bit :
begin
if is_constboolnode(node) then
begin
testrange(def,tordconstnode(node).value,false,false);
list.concat(Tai_const.Create_64bit(int64(tordconstnode(node).value.svalue)))
end
else
do_error;
end;
uchar :
begin
if is_constwidecharnode(node) then
inserttypeconv(node,cansichartype);
if is_constcharnode(node) or
((m_delphi in current_settings.modeswitches) and
is_constwidecharnode(node) and
(tordconstnode(node).value <= 255)) then
list.concat(Tai_const.Create_8bit(byte(tordconstnode(node).value.svalue)))
else
do_error;
end;
uwidechar :
begin
if is_constcharnode(node) then
inserttypeconv(node,cwidechartype);
if is_constwidecharnode(node) then
list.concat(Tai_const.Create_16bit(word(tordconstnode(node).value.svalue)))
else
do_error;
end;
s8bit,u8bit,
u16bit,s16bit,
s32bit,u32bit,
s64bit,u64bit :
begin
if is_constintnode(node) then
begin
testrange(def,tordconstnode(node).value,false,false);
case def.size of
1 :
list.concat(Tai_const.Create_8bit(byte(tordconstnode(node).value.svalue)));
2 :
list.concat(Tai_const.Create_16bit(word(tordconstnode(node).value.svalue)));
4 :
list.concat(Tai_const.Create_32bit(longint(tordconstnode(node).value.svalue)));
8 :
list.concat(Tai_const.Create_64bit(tordconstnode(node).value.svalue));
end;
end
else
do_error;
end;
scurrency:
begin
if is_constintnode(node) then
intvalue:=tordconstnode(node).value*10000
{ allow bootstrapping }
else if is_constrealnode(node) then
intvalue:=PInt64(@trealconstnode(node).value_currency)^
else
begin
intvalue:=0;
IncompatibleTypes(node.resultdef, def);
end;
list.concat(Tai_const.Create_64bit(intvalue));
end;
else
internalerror(200611052);
end;
end;
procedure tasmlisttypedconstbuilder.tc_emit_floatdef(def: tfloatdef; var node: tnode);
var
value : bestreal;
begin
value:=0.0;
if is_constrealnode(node) then
value:=trealconstnode(node).value_real
else if is_constintnode(node) then
value:=tordconstnode(node).value
else if is_constnode(node) then
IncompatibleTypes(node.resultdef, def)
else
Message(parser_e_illegal_expression);
case def.floattype of
s32real :
list.concat(Tai_real_32bit.Create(ts32real(value)));
s64real :
{$ifdef ARM}
if is_double_hilo_swapped then
list.concat(Tai_real_64bit.Create_hiloswapped(ts64real(value)))
else
{$endif ARM}
list.concat(Tai_real_64bit.Create(ts64real(value)));
s80real :
list.concat(Tai_real_80bit.Create(value,s80floattype.size));
sc80real :
list.concat(Tai_real_80bit.Create(value,sc80floattype.size));
s64comp :
{ the round is necessary for native compilers where comp isn't a float }
list.concat(Tai_comp_64bit.Create(round(value)));
s64currency:
list.concat(Tai_comp_64bit.Create(round(value*10000)));
s128real:
list.concat(Tai_real_128bit.Create(value));
else
internalerror(200611053);
end;
end;
procedure tasmlisttypedconstbuilder.tc_emit_classrefdef(def: tclassrefdef; var node: tnode);
begin
case node.nodetype of
loadvmtaddrn:
begin
if not def_is_related(tobjectdef(tclassrefdef(node.resultdef).pointeddef),tobjectdef(def.pointeddef)) then
IncompatibleTypes(node.resultdef, def);
list.concat(Tai_const.Create_sym(current_asmdata.RefAsmSymbol(Tobjectdef(tclassrefdef(node.resultdef).pointeddef).vmt_mangledname,AT_DATA)));
end;
niln:
list.concat(Tai_const.Create_sym(nil));
else if is_constnode(node) then
IncompatibleTypes(node.resultdef, def)
else
Message(parser_e_illegal_expression);
end;
end;
procedure tasmlisttypedconstbuilder.tc_emit_pointerdef(def: tpointerdef; var node: tnode);
var
hp : tnode;
srsym : tsym;
pd : tprocdef;
ca : pchar;
pw : pcompilerwidestring;
i,len : longint;
base,
offset : aint;
v : Tconstexprint;
ll : tasmlabel;
varalign : shortint;
begin
{ remove equal typecasts for pointer/nil addresses }
if (node.nodetype=typeconvn) then
with Ttypeconvnode(node) do
if (left.nodetype in [addrn,niln]) and equal_defs(def,node.resultdef) then
begin
hp:=left;
left:=nil;
node.free;
node:=hp;
end;
{ allows horrible ofs(typeof(TButton)^) code !! }
if (node.nodetype=addrn) then
with Taddrnode(node) do
if left.nodetype=derefn then
begin
hp:=tderefnode(left).left;
tderefnode(left).left:=nil;
node.free;
node:=hp;
end;
{ const pointer ? }
if (node.nodetype = pointerconstn) then
begin
{$if sizeof(TConstPtrUInt)=8}
list.concat(Tai_const.Create_64bit(int64(tpointerconstnode(node).value)));
{$else}
{$if sizeof(TConstPtrUInt)=4}
list.concat(Tai_const.Create_32bit(longint(tpointerconstnode(node).value)));
{$else}
internalerror(200404122);
{$endif} {$endif}
end
{ nil pointer ? }
else if node.nodetype=niln then
list.concat(Tai_const.Create_sym(nil))
{ maybe pchar ? }
else
if is_char(def.pointeddef) and
(node.nodetype<>addrn) then
begin
current_asmdata.getdatalabel(ll);
list.concat(Tai_const.Create_sym(ll));
if node.nodetype=stringconstn then
varalign:=size_2_align(tstringconstnode(node).len)
else
varalign:=0;
varalign:=const_align(varalign);
new_section(current_asmdata.asmlists[al_const], sec_rodata, ll.name, varalign);
current_asmdata.asmlists[al_const].concat(Tai_label.Create(ll));
if node.nodetype=stringconstn then
begin
len:=tstringconstnode(node).len;
{ For tp7 the maximum lentgh can be 255 }
if (m_tp7 in current_settings.modeswitches) and
(len>255) then
len:=255;
getmem(ca,len+2);
move(tstringconstnode(node).value_str^,ca^,len+1);
current_asmdata.asmlists[al_const].concat(Tai_string.Create_pchar(ca,len+1));
end
else
if is_constcharnode(node) then
current_asmdata.asmlists[al_const].concat(Tai_string.Create(char(byte(tordconstnode(node).value.svalue))+#0))
else
IncompatibleTypes(node.resultdef, def);
end
{ maybe pwidechar ? }
else
if is_widechar(def.pointeddef) and
(node.nodetype<>addrn) then
begin
current_asmdata.getdatalabel(ll);
list.concat(Tai_const.Create_sym(ll));
current_asmdata.asmlists[al_typedconsts].concat(tai_align.create(const_align(sizeof(pint))));
current_asmdata.asmlists[al_typedconsts].concat(Tai_label.Create(ll));
if (node.nodetype in [stringconstn,ordconstn]) then
begin
{ convert to unicodestring stringconstn }
inserttypeconv(node,cunicodestringtype);
if (node.nodetype=stringconstn) and
(tstringconstnode(node).cst_type in [cst_widestring,cst_unicodestring]) then
begin
pw:=pcompilerwidestring(tstringconstnode(node).value_str);
for i:=0 to tstringconstnode(node).len-1 do
current_asmdata.asmlists[al_typedconsts].concat(Tai_const.Create_16bit(pw^.data[i]));
{ ending #0 }
current_asmdata.asmlists[al_typedconsts].concat(Tai_const.Create_16bit(0))
end;
end
else
IncompatibleTypes(node.resultdef, def);
end
else
if (node.nodetype=addrn) or
is_proc2procvar_load(node,pd) then
begin
{ insert typeconv }
inserttypeconv(node,def);
hp:=node;
while assigned(hp) and (hp.nodetype in [addrn,typeconvn,subscriptn,vecn]) do
hp:=tunarynode(hp).left;
if (hp.nodetype=loadn) then
begin
hp:=node;
offset:=0;
while assigned(hp) and (hp.nodetype<>loadn) do
begin
case hp.nodetype of
vecn :
begin
len:=1;
base:=0;
case tvecnode(hp).left.resultdef.typ of
stringdef :
;
arraydef :
begin
if not is_packed_array(tvecnode(hp).left.resultdef) then
begin
len:=tarraydef(tvecnode(hp).left.resultdef).elesize;
base:=tarraydef(tvecnode(hp).left.resultdef).lowrange;
end
else
Message(parser_e_packed_dynamic_open_array);
end;
else
Message(parser_e_illegal_expression);
end;
if is_constintnode(tvecnode(hp).right) then
begin
{Prevent overflow.}
v:=get_ordinal_value(tvecnode(hp).right)-base;
if (v<int64(low(offset))) or (v>int64(high(offset))) then
message3(type_e_range_check_error_bounds,tostr(v),tostr(low(offset)),tostr(high(offset)));
if high(offset)-offset div len>v then
inc(offset,len*v.svalue)
else
message3(type_e_range_check_error_bounds,tostr(v),'0',tostr(high(offset)-offset div len))
end
else
Message(parser_e_illegal_expression);
end;
subscriptn :
inc(offset,tsubscriptnode(hp).vs.fieldoffset);
typeconvn :
begin
if not(ttypeconvnode(hp).convtype in [tc_equal,tc_proc_2_procvar]) then
Message(parser_e_illegal_expression);
end;
addrn :
;
else
Message(parser_e_illegal_expression);
end;
hp:=tunarynode(hp).left;
end;
srsym:=tloadnode(hp).symtableentry;
case srsym.typ of
procsym :
begin
pd:=tprocdef(tprocsym(srsym).ProcdefList[0]);
if Tprocsym(srsym).ProcdefList.Count>1 then
Message(parser_e_no_overloaded_procvars);
if po_abstractmethod in pd.procoptions then
Message(type_e_cant_take_address_of_abstract_method)
else
list.concat(Tai_const.Createname(pd.mangledname,offset));
end;
staticvarsym :
list.concat(Tai_const.Createname(tstaticvarsym(srsym).mangledname,offset));
labelsym :
list.concat(Tai_const.Createname(tlabelsym(srsym).mangledname,offset));
constsym :
if tconstsym(srsym).consttyp=constresourcestring then
list.concat(Tai_const.Createname(make_mangledname('RESSTR',tconstsym(srsym).owner,tconstsym(srsym).name),AT_DATA,sizeof(pint)))
else
Message(type_e_variable_id_expected);
else
Message(type_e_variable_id_expected);
end;
end
else
Message(parser_e_illegal_expression);
end
else
{ allow typeof(Object type)}
if (node.nodetype=inlinen) and
(tinlinenode(node).inlinenumber=in_typeof_x) then
begin
if (tinlinenode(node).left.nodetype=typen) then
begin
list.concat(Tai_const.createname(
tobjectdef(tinlinenode(node).left.resultdef).vmt_mangledname,AT_DATA,0));
end
else
Message(parser_e_illegal_expression);
end
else
Message(parser_e_illegal_expression);
end;
procedure tasmlisttypedconstbuilder.tc_emit_setdef(def: tsetdef; var node: tnode);
type
setbytes = array[0..31] of byte;
Psetbytes = ^setbytes;
var
i: longint;
begin
if node.nodetype=setconstn then
begin
{ be sure to convert to the correct result, else
it can generate smallset data instead of normalset (PFV) }
inserttypeconv(node,def);
{ we only allow const sets }
if (node.nodetype<>setconstn) or
assigned(tsetconstnode(node).left) then
Message(parser_e_illegal_expression)
else
begin
tsetconstnode(node).adjustforsetbase;
{ this writing is endian-dependant }
if source_info.endian = target_info.endian then
begin
for i:=0 to node.resultdef.size-1 do
list.concat(tai_const.create_8bit(Psetbytes(tsetconstnode(node).value_set)^[i]));
end
else
begin
for i:=0 to node.resultdef.size-1 do
list.concat(tai_const.create_8bit(reverse_byte(Psetbytes(tsetconstnode(node).value_set)^[i])));
end;
end;
end
else
Message(parser_e_illegal_expression);
end;
procedure tasmlisttypedconstbuilder.tc_emit_enumdef(def: tenumdef; var node: tnode);
begin
if node.nodetype=ordconstn then
begin
if equal_defs(node.resultdef,def) or
is_subequal(node.resultdef,def) then
begin
testrange(def,tordconstnode(node).value,false,false);
case longint(node.resultdef.size) of
1 : list.concat(Tai_const.Create_8bit(Byte(tordconstnode(node).value.svalue)));
2 : list.concat(Tai_const.Create_16bit(Word(tordconstnode(node).value.svalue)));
4 : list.concat(Tai_const.Create_32bit(Longint(tordconstnode(node).value.svalue)));
end;
end
else
IncompatibleTypes(node.resultdef,def);
end
else
Message(parser_e_illegal_expression);
end;
{ parse a single constant and add it to the packed const info }
{ represented by curval etc (see explanation of bitpackval for }
{ what the different parameters mean) }
function tasmlisttypedconstbuilder.parse_single_packed_const(def: tdef; var bp: tbitpackedval): boolean;
var
node: tnode;
begin
result:=true;
node:=comp_expr(true,false);
if (node.nodetype <> ordconstn) or
(not equal_defs(node.resultdef,def) and
not is_subequal(node.resultdef,def)) then
begin
node.free;
incompatibletypes(node.resultdef,def);
consume_all_until(_SEMICOLON);
result:=false;
exit;
end;
if (Tordconstnode(node).value<qword(low(Aword))) or (Tordconstnode(node).value>qword(high(Aword))) then
message3(type_e_range_check_error_bounds,tostr(Tordconstnode(node).value),tostr(low(Aword)),tostr(high(Aword)))
else
bitpackval(Tordconstnode(node).value.uvalue,bp);
if (bp.curbitoffset>=AIntBits) then
flush_packed_value(list,bp);
node.free;
end;
procedure tasmlisttypedconstbuilder.parse_arraydef(def:tarraydef);
var
n : tnode;
i : longint;
len : asizeint;
ch : array[0..1] of char;
ca : pbyte;
int_const: tai_const;
char_size: integer;
oldoffset: asizeint;
dummy : byte;
begin
{ dynamic array nil }
if is_dynamic_array(def) then
begin
{ Only allow nil initialization }
consume(_NIL);
list.concat(Tai_const.Create_sym(nil));
end
{ packed array constant }
else if is_packed_array(def) and
((def.elepackedbitsize mod 8 <> 0) or
not ispowerof2(def.elepackedbitsize div 8,i)) then
begin
parse_packed_array_def(def);
end
{ normal array const between brackets }
else if try_to_consume(_LKLAMMER) then
begin
oldoffset:=curoffset;
curoffset:=0;
for i:=def.lowrange to def.highrange-1 do
begin
read_typed_const_data(def.elementdef);
Inc(curoffset,def.elementdef.size);
if token=_RKLAMMER then
begin
Message1(parser_e_more_array_elements_expected,tostr(def.highrange-i));
consume(_RKLAMMER);
exit;
end
else
consume(_COMMA);
end;
read_typed_const_data(def.elementdef);
consume(_RKLAMMER);
curoffset:=oldoffset;
end
{ if array of char then we allow also a string }
else if is_anychar(def.elementdef) then
begin
char_size:=def.elementdef.size;
n:=comp_expr(true,false);
if n.nodetype=stringconstn then
begin
len:=tstringconstnode(n).len;
case char_size of
1:
begin
if (tstringconstnode(n).cst_type in [cst_unicodestring,cst_widestring]) then
inserttypeconv(n,getansistringdef);
if n.nodetype<>stringconstn then
internalerror(2010033003);
ca:=pointer(tstringconstnode(n).value_str);
end;
2:
begin
inserttypeconv(n,cunicodestringtype);
if n.nodetype<>stringconstn then
internalerror(2010033003);
ca:=pointer(pcompilerwidestring(tstringconstnode(n).value_str)^.data)
end;
else
internalerror(2010033005);
end;
{ 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
case char_size of
1:
ch[0]:=chr(tordconstnode(n).value.uvalue and $ff);
2:
begin
inserttypeconv(n,cwidechartype);
if not is_constwidecharnode(n) then
internalerror(2010033001);
widechar(ch):=widechar(tordconstnode(n).value.uvalue and $ffff);
end;
else
internalerror(2010033002);
end;
ca:=@ch;
len:=1;
end
else if is_constwidecharnode(n) and (current_settings.sourcecodepage<>CP_UTF8) then
begin
case char_size of
1:
begin
inserttypeconv(n,cansichartype);
if not is_constcharnode(n) then
internalerror(2010033001);
ch[0]:=chr(tordconstnode(n).value.uvalue and $ff);
end;
2:
widechar(ch):=widechar(tordconstnode(n).value.uvalue and $ffff);
else
internalerror(2010033002);
end;
ca:=@ch;
len:=1;
end
else
begin
Message(parser_e_illegal_expression);
len:=0;
{ avoid crash later on }
dummy:=0;
ca:=@dummy;
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
case char_size of
1:
int_const:=Tai_const.Create_char(char_size,pbyte(ca)^);
2:
int_const:=Tai_const.Create_char(char_size,pword(ca)^);
else
internalerror(2010033004);
end;
inc(ca, char_size);
end
else
{Fill the remaining positions with #0.}
int_const:=Tai_const.Create_char(char_size,0);
list.concat(int_const)
end;
n.free;
end
else
begin
{ we want the ( }
consume(_LKLAMMER);
end;
end;
procedure tasmlisttypedconstbuilder.parse_procvardef(def:tprocvardef);
var
tmpn,n : tnode;
pd : tprocdef;
begin
{ Procvars and pointers are no longer compatible. }
{ under tp: =nil or =var under fpc: =nil or =@var }
if try_to_consume(_NIL) then
begin
list.concat(Tai_const.Create_sym(nil));
if not def.is_addressonly then
list.concat(Tai_const.Create_sym(nil));
exit;
end;
{ you can't assign a value other than NIL to a typed constant }
{ which is a "procedure of object", because this also requires }
{ address of an object/class instance, which is not known at }
{ compile time (JM) }
if (po_methodpointer in def.procoptions) then
Message(parser_e_no_procvarobj_const);
{ parse the rest too, so we can continue with error checking }
getprocvardef:=def;
n:=comp_expr(true,false);
getprocvardef:=nil;
if codegenerror then
begin
n.free;
exit;
end;
{ let type conversion check everything needed }
inserttypeconv(n,def);
if codegenerror then
begin
n.free;
exit;
end;
{ remove typeconvs, that will normally insert a lea
instruction which is not necessary for us }
while n.nodetype=typeconvn do
begin
tmpn:=ttypeconvnode(n).left;
ttypeconvnode(n).left:=nil;
n.free;
n:=tmpn;
end;
{ remove addrn which we also don't need here }
if n.nodetype=addrn then
begin
tmpn:=taddrnode(n).left;
taddrnode(n).left:=nil;
n.free;
n:=tmpn;
end;
{ we now need to have a loadn with a procsym }
if (n.nodetype=loadn) and
(tloadnode(n).symtableentry.typ=procsym) then
begin
pd:=tloadnode(n).procdef;
list.concat(Tai_const.createname(pd.mangledname,0));
{ nested procvar typed consts can only be initialised with nil
(checked above) or with a global procedure (checked here),
because in other cases we need a valid frame pointer }
if is_nested_pd(def) then
begin
if is_nested_pd(pd) then
Message(parser_e_no_procvarnested_const);
list.concat(Tai_const.Create_sym(nil));
end
end
else if n.nodetype=pointerconstn then
list.concat(Tai_const.Create_pint(tpointerconstnode(n).value))
else
Message(parser_e_illegal_expression);
n.free;
end;
procedure tasmlisttypedconstbuilder.parse_recorddef(def:trecorddef);
var
n : tnode;
symidx : longint;
recsym,
srsym : tsym;
hs : string;
sorg,s : TIDString;
tmpguid : tguid;
recoffset,
fillbytes : aint;
bp : tbitpackedval;
error,
is_packed: boolean;
startoffset: aint;
procedure handle_stringconstn;
var
i : longint;
begin
hs:=strpas(tstringconstnode(n).value_str);
if string2guid(hs,tmpguid) then
begin
list.concat(Tai_const.Create_32bit(longint(tmpguid.D1)));
list.concat(Tai_const.Create_16bit(tmpguid.D2));
list.concat(Tai_const.Create_16bit(tmpguid.D3));
for i:=Low(tmpguid.D4) to High(tmpguid.D4) do
list.concat(Tai_const.Create_8bit(tmpguid.D4[i]));
end
else
Message(parser_e_improper_guid_syntax);
end;
var
i : longint;
SymList:TFPHashObjectList;
begin
{ GUID }
if (def=rec_tguid) and (token=_ID) then
begin
n:=comp_expr(true,false);
if n.nodetype=stringconstn then
handle_stringconstn
else
begin
inserttypeconv(n,rec_tguid);
if n.nodetype=guidconstn then
begin
tmpguid:=tguidconstnode(n).value;
list.concat(Tai_const.Create_32bit(longint(tmpguid.D1)));
list.concat(Tai_const.Create_16bit(tmpguid.D2));
list.concat(Tai_const.Create_16bit(tmpguid.D3));
for i:=Low(tmpguid.D4) to High(tmpguid.D4) do
list.concat(Tai_const.Create_8bit(tmpguid.D4[i]));
end
else
Message(parser_e_illegal_expression);
end;
n.free;
exit;
end;
if (def=rec_tguid) and ((token=_CSTRING) or (token=_CCHAR)) then
begin
n:=comp_expr(true,false);
inserttypeconv(n,cshortstringtype);
if n.nodetype=stringconstn then
handle_stringconstn
else
Message(parser_e_illegal_expression);
n.free;
exit;
end;
{ bitpacked record? }
is_packed:=is_packed_record_or_object(def);
if (is_packed) then
begin
{ loadbitsize = 8, bitpacked records are always padded to }
{ a multiple of a byte. packedbitsize will be set separately }
{ for each field }
initbitpackval(bp,0);
bp.loadbitsize:=8;
end;
{ normal record }
consume(_LKLAMMER);
recoffset:=0;
sorg:='';
symidx:=0;
symlist:=def.symtable.SymList;
srsym:=get_next_varsym(def,symlist,symidx);
recsym := nil;
startoffset:=curoffset;
while token<>_RKLAMMER do
begin
s:=pattern;
sorg:=orgpattern;
consume(_ID);
consume(_COLON);
error := false;
recsym := tsym(def.symtable.Find(s));
if not assigned(recsym) then
begin
Message1(sym_e_illegal_field,sorg);
error := true;
end;
if (not error) and
(not assigned(srsym) or
(s <> srsym.name)) then
{ possible variant record (JM) }
begin
{ All parts of a variant start at the same offset }
{ Also allow jumping from one variant part to another, }
{ as long as the offsets match }
if (assigned(srsym) and
(tfieldvarsym(recsym).fieldoffset = tfieldvarsym(srsym).fieldoffset)) or
{ srsym is not assigned after parsing w2 in the }
{ typed const in the next example: }
{ type tr = record case byte of }
{ 1: (l1,l2: dword); }
{ 2: (w1,w2: word); }
{ end; }
{ const r: tr = (w1:1;w2:1;l2:5); }
(tfieldvarsym(recsym).fieldoffset = recoffset) then
begin
srsym:=recsym;
{ symidx should contain the next symbol id to search }
symidx:=SymList.indexof(srsym)+1;
end
{ going backwards isn't allowed in any mode }
else if (tfieldvarsym(recsym).fieldoffset<recoffset) then
begin
Message(parser_e_invalid_record_const);
error := true;
end
{ Delphi allows you to skip fields }
else if (m_delphi in current_settings.modeswitches) then
begin
Message1(parser_w_skipped_fields_before,sorg);
srsym := recsym;
end
{ FPC and TP don't }
else
begin
Message1(parser_e_skipped_fields_before,sorg);
error := true;
end;
end;
if error then
consume_all_until(_SEMICOLON)
else
begin
{ if needed fill (alignment) }
if tfieldvarsym(srsym).fieldoffset>recoffset then
begin
if not(is_packed) then
fillbytes:=tfieldvarsym(srsym).fieldoffset-recoffset
else
begin
flush_packed_value(list,bp);
{ curoffset is now aligned to the next byte }
recoffset:=align(recoffset,8);
{ offsets are in bits in this case }
fillbytes:=(tfieldvarsym(srsym).fieldoffset-recoffset) div 8;
end;
for i:=1 to fillbytes do
list.concat(Tai_const.Create_8bit(0))
end;
{ new position }
recoffset:=tfieldvarsym(srsym).fieldoffset;
if not(is_packed) then
inc(recoffset,tfieldvarsym(srsym).vardef.size)
else
inc(recoffset,tfieldvarsym(srsym).vardef.packedbitsize);
{ read the data }
if not(is_packed) or
{ only orddefs and enumdefs are bitpacked, as in gcc/gpc }
not(tfieldvarsym(srsym).vardef.typ in [orddef,enumdef]) then
begin
if is_packed then
begin
flush_packed_value(list,bp);
recoffset:=align(recoffset,8);
end;
curoffset:=startoffset+tfieldvarsym(srsym).fieldoffset;
read_typed_const_data(tfieldvarsym(srsym).vardef);
end
else
begin
bp.packedbitsize:=tfieldvarsym(srsym).vardef.packedbitsize;
parse_single_packed_const(tfieldvarsym(srsym).vardef,bp);
end;
{ keep previous field for checking whether whole }
{ record was initialized (JM) }
recsym := srsym;
{ goto next field }
srsym:=get_next_varsym(def,SymList,symidx);
if token=_SEMICOLON then
consume(_SEMICOLON)
else if (token=_COMMA) and (m_mac in current_settings.modeswitches) then
consume(_COMMA)
else
break;
end;
end;
curoffset:=startoffset;
{ are there any fields left, but don't complain if there only
come other variant parts after the last initialized field }
if assigned(srsym) and
(
(recsym=nil) or
(tfieldvarsym(srsym).fieldoffset > tfieldvarsym(recsym).fieldoffset)
) then
Message1(parser_w_skipped_fields_after,sorg);
if not(is_packed) then
fillbytes:=def.size-recoffset
else
begin
flush_packed_value(list,bp);
recoffset:=align(recoffset,8);
fillbytes:=def.size-(recoffset div 8);
end;
for i:=1 to fillbytes do
list.concat(Tai_const.Create_8bit(0));
consume(_RKLAMMER);
end;
procedure tasmlisttypedconstbuilder.parse_objectdef(def:tobjectdef);
var
n : tnode;
i : longint;
obj : tobjectdef;
srsym : tsym;
st : tsymtable;
objoffset : aint;
s,sorg : TIDString;
vmtwritten : boolean;
startoffset:aint;
begin
{ no support for packed object }
if is_packed_record_or_object(def) then
begin
Message(type_e_no_const_packed_record);
exit;
end;
{ only allow nil for implicit pointer object types }
if is_implicit_pointer_object_type(def) then
begin
n:=comp_expr(true,false);
if n.nodetype<>niln then
begin
Message(parser_e_type_const_not_possible);
consume_all_until(_SEMICOLON);
end
else
list.concat(Tai_const.Create_sym(nil));
n.free;
exit;
end;
{ for objects we allow it only if it doesn't contain a vmt }
if (oo_has_vmt in def.objectoptions) and
(m_fpc in current_settings.modeswitches) then
begin
Message(parser_e_type_object_constants);
exit;
end;
consume(_LKLAMMER);
startoffset:=curoffset;
objoffset:=0;
vmtwritten:=false;
while token<>_RKLAMMER do
begin
s:=pattern;
sorg:=orgpattern;
consume(_ID);
consume(_COLON);
srsym:=nil;
obj:=tobjectdef(def);
st:=obj.symtable;
while (srsym=nil) and assigned(st) do
begin
srsym:=tsym(st.Find(s));
if assigned(obj) then
obj:=obj.childof;
if assigned(obj) then
st:=obj.symtable
else
st:=nil;
end;
if (srsym=nil) or
(srsym.typ<>fieldvarsym) then
begin
if (srsym=nil) then
Message1(sym_e_id_not_found,sorg)
else
Message1(sym_e_illegal_field,sorg);
consume_all_until(_RKLAMMER);
break;
end
else
with tfieldvarsym(srsym) do
begin
{ check position }
if fieldoffset<objoffset then
message(parser_e_invalid_record_const);
{ check in VMT needs to be added for TP mode }
if not(vmtwritten) and
not(m_fpc in current_settings.modeswitches) and
(oo_has_vmt in def.objectoptions) and
(def.vmt_offset<fieldoffset) then
begin
for i:=1 to def.vmt_offset-objoffset do
list.concat(tai_const.create_8bit(0));
list.concat(tai_const.createname(def.vmt_mangledname,AT_DATA,0));
{ this is more general }
objoffset:=def.vmt_offset + sizeof(pint);
vmtwritten:=true;
end;
{ if needed fill }
if fieldoffset>objoffset then
for i:=1 to fieldoffset-objoffset do
list.concat(Tai_const.Create_8bit(0));
{ new position }
objoffset:=fieldoffset+vardef.size;
{ read the data }
curoffset:=startoffset+fieldoffset;
read_typed_const_data(vardef);
if not try_to_consume(_SEMICOLON) then
break;
end;
end;
curoffset:=startoffset;
if not(m_fpc in current_settings.modeswitches) and
(oo_has_vmt in def.objectoptions) and
(def.vmt_offset>=objoffset) then
begin
for i:=1 to def.vmt_offset-objoffset do
list.concat(tai_const.create_8bit(0));
list.concat(tai_const.createname(def.vmt_mangledname,AT_DATA,0));
{ this is more general }
objoffset:=def.vmt_offset + sizeof(pint);
end;
for i:=1 to def.size-objoffset do
list.concat(Tai_const.Create_8bit(0));
consume(_RKLAMMER);
end;
function tasmlisttypedconstbuilder.parse_into_asmlist: tasmlist;
begin
read_typed_const_data(tcsym.vardef);
result:=list;
end;
{ tnodetreetypedconstbuilder }
procedure tnodetreetypedconstbuilder.parse_arraydef(def: tarraydef);
var
n : tnode;
i : longint;
orgbase: tnode;
begin
{ dynamic array nil }
if is_dynamic_array(def) then
begin
{ Only allow nil initialization }
consume(_NIL);
addstatement(statmnt,cassignmentnode.create_internal(basenode,cnilnode.create));
basenode:=nil;
end
{ array const between brackets }
else if try_to_consume(_LKLAMMER) then
begin
orgbase:=basenode;
for i:=def.lowrange to def.highrange-1 do
begin
basenode:=cvecnode.create(orgbase.getcopy,ctypeconvnode.create_explicit(genintconstnode(i),tarraydef(def).rangedef));
read_typed_const_data(def.elementdef);
if token=_RKLAMMER then
begin
Message1(parser_e_more_array_elements_expected,tostr(def.highrange-i));
consume(_RKLAMMER);
exit;
end
else
consume(_COMMA);
end;
basenode:=cvecnode.create(orgbase,ctypeconvnode.create_explicit(genintconstnode(def.highrange),tarraydef(def).rangedef));
read_typed_const_data(def.elementdef);
consume(_RKLAMMER);
end
{ if array of char then we allow also a string }
else if is_anychar(def.elementdef) then
begin
n:=comp_expr(true,false);
addstatement(statmnt,cassignmentnode.create_internal(basenode,n));
basenode:=nil;
end
else
begin
{ we want the ( }
consume(_LKLAMMER);
end;
end;
procedure tnodetreetypedconstbuilder.parse_procvardef(def: tprocvardef);
begin
addstatement(statmnt,cassignmentnode.create_internal(basenode,comp_expr(true,false)));
basenode:=nil;
end;
procedure tnodetreetypedconstbuilder.parse_recorddef(def: trecorddef);
var
n,n2 : tnode;
SymList:TFPHashObjectList;
orgbasenode : tnode;
symidx : longint;
recsym,
srsym : tsym;
sorg,s : TIDString;
recoffset : aint;
error,
is_packed: boolean;
procedure handle_stringconstn;
begin
addstatement(statmnt,cassignmentnode.create_internal(basenode,n));
basenode:=nil;
n:=nil;
end;
begin
{ GUID }
if (def=rec_tguid) and (token=_ID) then
begin
n:=comp_expr(true,false);
if n.nodetype=stringconstn then
handle_stringconstn
else
begin
inserttypeconv(n,rec_tguid);
if n.nodetype=guidconstn then
begin
n2:=cstringconstnode.createstr(guid2string(tguidconstnode(n).value));
n.free;
n:=n2;
handle_stringconstn;
end
else
Message(parser_e_illegal_expression);
end;
n.free;
exit;
end;
if (def=rec_tguid) and ((token=_CSTRING) or (token=_CCHAR)) then
begin
n:=comp_expr(true,false);
inserttypeconv(n,cshortstringtype);
if n.nodetype=stringconstn then
handle_stringconstn
else
Message(parser_e_illegal_expression);
n.free;
exit;
end;
{ bitpacked record? }
is_packed:=is_packed_record_or_object(def);
{ normal record }
consume(_LKLAMMER);
recoffset:=0;
sorg:='';
symidx:=0;
symlist:=def.symtable.SymList;
srsym:=get_next_varsym(def,symlist,symidx);
recsym := nil;
orgbasenode:=basenode;
basenode:=nil;
while token<>_RKLAMMER do
begin
s:=pattern;
sorg:=orgpattern;
consume(_ID);
consume(_COLON);
error := false;
recsym := tsym(def.symtable.Find(s));
if not assigned(recsym) then
begin
Message1(sym_e_illegal_field,sorg);
error := true;
end;
if (not error) and
(not assigned(srsym) or
(s <> srsym.name)) then
{ possible variant record (JM) }
begin
{ All parts of a variant start at the same offset }
{ Also allow jumping from one variant part to another, }
{ as long as the offsets match }
if (assigned(srsym) and
(tfieldvarsym(recsym).fieldoffset = tfieldvarsym(srsym).fieldoffset)) or
{ srsym is not assigned after parsing w2 in the }
{ typed const in the next example: }
{ type tr = record case byte of }
{ 1: (l1,l2: dword); }
{ 2: (w1,w2: word); }
{ end; }
{ const r: tr = (w1:1;w2:1;l2:5); }
(tfieldvarsym(recsym).fieldoffset = recoffset) then
begin
srsym:=recsym;
{ symidx should contain the next symbol id to search }
symidx:=SymList.indexof(srsym)+1;
end
{ going backwards isn't allowed in any mode }
else if (tfieldvarsym(recsym).fieldoffset<recoffset) then
begin
Message(parser_e_invalid_record_const);
error := true;
end
{ Delphi allows you to skip fields }
else if (m_delphi in current_settings.modeswitches) then
begin
Message1(parser_w_skipped_fields_before,sorg);
srsym := recsym;
end
{ FPC and TP don't }
else
begin
Message1(parser_e_skipped_fields_before,sorg);
error := true;
end;
end;
if error then
consume_all_until(_SEMICOLON)
else
begin
{ skipping fill bytes happens automatically, since we only
initialize the defined fields }
{ new position }
recoffset:=tfieldvarsym(srsym).fieldoffset;
if not(is_packed) then
inc(recoffset,tfieldvarsym(srsym).vardef.size)
else
inc(recoffset,tfieldvarsym(srsym).vardef.packedbitsize);
{ read the data }
if is_packed and
{ only orddefs and enumdefs are bitpacked, as in gcc/gpc }
not(tfieldvarsym(srsym).vardef.typ in [orddef,enumdef]) then
recoffset:=align(recoffset,8);
basenode:=csubscriptnode.create(srsym,orgbasenode.getcopy);
read_typed_const_data(tfieldvarsym(srsym).vardef);
{ keep previous field for checking whether whole }
{ record was initialized (JM) }
recsym := srsym;
{ goto next field }
srsym:=get_next_varsym(def,SymList,symidx);
if token=_SEMICOLON then
consume(_SEMICOLON)
else if (token=_COMMA) and (m_mac in current_settings.modeswitches) then
consume(_COMMA)
else
break;
end;
end;
{ are there any fields left, but don't complain if there only
come other variant parts after the last initialized field }
if assigned(srsym) and
(
(recsym=nil) or
(tfieldvarsym(srsym).fieldoffset > tfieldvarsym(recsym).fieldoffset)
) then
Message1(parser_w_skipped_fields_after,sorg);
orgbasenode.free;
basenode:=nil;
consume(_RKLAMMER);
end;
procedure tnodetreetypedconstbuilder.parse_objectdef(def: tobjectdef);
var
n,
orgbasenode : tnode;
obj : tobjectdef;
srsym : tsym;
st : tsymtable;
objoffset : aint;
s,sorg : TIDString;
begin
{ no support for packed object }
if is_packed_record_or_object(def) then
begin
Message(type_e_no_const_packed_record);
exit;
end;
{ only allow nil for implicit pointer object types }
if is_implicit_pointer_object_type(def) then
begin
n:=comp_expr(true,false);
if n.nodetype<>niln then
begin
Message(parser_e_type_const_not_possible);
consume_all_until(_SEMICOLON);
end
else
begin
addstatement(statmnt,cassignmentnode.create_internal(basenode,n));
n:=nil;
basenode:=nil;
end;
n.free;
exit;
end;
{ for objects we allow it only if it doesn't contain a vmt }
if (oo_has_vmt in def.objectoptions) and
(m_fpc in current_settings.modeswitches) then
begin
Message(parser_e_type_object_constants);
exit;
end;
consume(_LKLAMMER);
objoffset:=0;
orgbasenode:=basenode;
basenode:=nil;
while token<>_RKLAMMER do
begin
s:=pattern;
sorg:=orgpattern;
consume(_ID);
consume(_COLON);
srsym:=nil;
obj:=tobjectdef(def);
st:=obj.symtable;
while (srsym=nil) and assigned(st) do
begin
srsym:=tsym(st.Find(s));
if assigned(obj) then
obj:=obj.childof;
if assigned(obj) then
st:=obj.symtable
else
st:=nil;
end;
if (srsym=nil) or
(srsym.typ<>fieldvarsym) then
begin
if (srsym=nil) then
Message1(sym_e_id_not_found,sorg)
else
Message1(sym_e_illegal_field,sorg);
consume_all_until(_RKLAMMER);
break;
end
else
with tfieldvarsym(srsym) do
begin
{ check position }
if fieldoffset<objoffset then
message(parser_e_invalid_record_const);
{ new position }
objoffset:=fieldoffset+vardef.size;
{ read the data }
basenode:=csubscriptnode.create(srsym,orgbasenode.getcopy);
read_typed_const_data(vardef);
if not try_to_consume(_SEMICOLON) then
break;
end;
end;
consume(_RKLAMMER);
end;
procedure tnodetreetypedconstbuilder.tc_emit_orddef(def: torddef; var node: tnode);
begin
addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
basenode:=nil;
node:=nil;
end;
procedure tnodetreetypedconstbuilder.tc_emit_floatdef(def: tfloatdef; var node: tnode);
begin
addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
basenode:=nil;
node:=nil;
end;
procedure tnodetreetypedconstbuilder.tc_emit_classrefdef(def: tclassrefdef; var node: tnode);
begin
addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
basenode:=nil;
node:=nil;
end;
procedure tnodetreetypedconstbuilder.tc_emit_pointerdef(def: tpointerdef; var node: tnode);
begin
addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
basenode:=nil;
node:=nil;
end;
procedure tnodetreetypedconstbuilder.tc_emit_setdef(def: tsetdef; var node: tnode);
begin
addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
basenode:=nil;
node:=nil;
end;
procedure tnodetreetypedconstbuilder.tc_emit_enumdef(def: tenumdef; var node: tnode);
begin
addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
basenode:=nil;
node:=nil;
end;
procedure tnodetreetypedconstbuilder.tc_emit_stringdef(def: tstringdef; var node: tnode);
begin
addstatement(statmnt,cassignmentnode.create_internal(basenode,node));
basenode:=nil;
node:=nil;
end;
constructor tnodetreetypedconstbuilder.create(sym: tstaticvarsym; previnit: tnode);
begin
inherited create(sym);
basenode:=cloadnode.create(sym,sym.owner);
resultblock:=internalstatements(statmnt);
if assigned(previnit) then
addstatement(statmnt,previnit);
end;
destructor tnodetreetypedconstbuilder.destroy;
begin
freeandnil(basenode);
freeandnil(resultblock);
inherited destroy;
end;
function tnodetreetypedconstbuilder.parse_into_nodetree: tnode;
begin
read_typed_const_data(tcsym.vardef);
result:=self.resultblock;
self.resultblock:=nil;
end;
begin
{ default to asmlist version, best for most targets }
ctypedconstbuilder:=tasmlisttypedconstbuilder;
end.
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