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{
Copyright (c) 1998-2002 by Florian Klaempfl
Generate assembler for constant nodes which are the same for
all (most) processors
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 ncgcon;
{$i fpcdefs.inc}
interface
uses
aasmbase,
symtype,
ncon;
type
tcgrealconstnode = class(trealconstnode)
procedure pass_generate_code;override;
end;
tcgordconstnode = class(tordconstnode)
procedure pass_generate_code;override;
end;
tcgpointerconstnode = class(tpointerconstnode)
procedure pass_generate_code;override;
end;
tcgstringconstnode = class(tstringconstnode)
procedure pass_generate_code;override;
protected
procedure load_dynstring(const strpointerdef: tdef; const elementdef: tdef; const winlikewidestring: boolean); virtual;
end;
tcgsetconstnode = class(tsetconstnode)
protected
function emitvarsetconst: tasmsymbol; virtual;
procedure handlevarsetconst;
public
procedure pass_generate_code;override;
end;
tcgnilnode = class(tnilnode)
procedure pass_generate_code;override;
end;
tcgguidconstnode = class(tguidconstnode)
procedure pass_generate_code;override;
end;
implementation
uses
globtype,widestr,systems,
verbose,globals,cutils,
aasmcnst,
symconst,symdef,aasmtai,aasmdata,defutil,
cpuinfo,cpubase,
cgbase,cgutils,
hlcgobj,cclasses
;
{*****************************************************************************
TCGREALCONSTNODE
*****************************************************************************}
procedure tcgrealconstnode.pass_generate_code;
{ I suppose the parser/pass_1 must make sure the generated real }
{ constants are actually supported by the target processor? (JM) }
const
floattype2ait:array[tfloattype] of tairealconsttype=
(aitrealconst_s32bit,aitrealconst_s64bit,aitrealconst_s80bit,aitrealconst_s80bit,aitrealconst_s64comp,aitrealconst_s64comp,aitrealconst_s128bit);
{ Since the value is stored always as bestreal, we share a single pool
between all float types. This requires type and hiloswapped flag to
be matched along with the value }
type
tfloatkey = record
value: bestreal;
typ: tfloattype;
swapped: boolean;
end;
var
lastlabel : tasmlabel;
realait : tairealconsttype;
entry : PHashSetItem;
key: tfloatkey;
{$ifdef ARM}
hiloswapped : boolean;
{$endif ARM}
begin
location_reset_ref(location,LOC_CREFERENCE,def_cgsize(resultdef),const_align(resultdef.alignment),[]);
lastlabel:=nil;
realait:=floattype2ait[tfloatdef(resultdef).floattype];
{$ifdef ARM}
hiloswapped:=is_double_hilo_swapped;
{$endif ARM}
{ const already used ? }
if not assigned(lab_real) then
begin
{ there may be gap between record fields, zero it out }
fillchar(key,sizeof(key),0);
key.value:=value_real;
key.typ:=tfloatdef(resultdef).floattype;
{$ifdef ARM}
key.swapped:=hiloswapped;
{$endif ARM}
entry := current_asmdata.ConstPools[sp_floats].FindOrAdd(@key, sizeof(key));
lab_real := TAsmLabel(entry^.Data); // is it needed anymore?
{ :-(, we must generate a new entry }
if not(assigned(lab_real)) then
begin
current_asmdata.getglobaldatalabel(lastlabel);
entry^.Data:=lastlabel;
lab_real:=lastlabel;
maybe_new_object_file(current_asmdata.asmlists[al_typedconsts]);
new_section(current_asmdata.asmlists[al_typedconsts],sec_rodata_norel,lastlabel.name,const_align(resultdef.alignment));
current_asmdata.asmlists[al_typedconsts].concat(Tai_label.Create(lastlabel));
case realait of
aitrealconst_s32bit :
begin
current_asmdata.asmlists[al_typedconsts].concat(tai_realconst.create_s32real(ts32real(value_real)));
end;
aitrealconst_s64bit :
begin
{$ifdef ARM}
if hiloswapped then
current_asmdata.asmlists[al_typedconsts].concat(tai_realconst.create_s64real_hiloswapped(ts64real(value_real)))
else
{$endif ARM}
current_asmdata.asmlists[al_typedconsts].concat(tai_realconst.create_s64real(ts64real(value_real)));
end;
aitrealconst_s80bit :
begin
current_asmdata.asmlists[al_typedconsts].concat(tai_realconst.create_s80real(value_real,tfloatdef(resultdef).size));
end;
{$ifdef cpufloat128}
aitrealconst_s128bit :
begin
current_asmdata.asmlists[al_typedconsts].concat(tai_realconst.create_s128real(value_real));
end;
{$endif cpufloat128}
{ the round is necessary for native compilers where comp isn't a float }
aitrealconst_s64comp :
if (value_real>9223372036854775807.0) or (value_real<-9223372036854775808.0) then
message(parser_e_range_check_error)
else
current_asmdata.asmlists[al_typedconsts].concat(tai_realconst.create_s64compreal(round(value_real)));
else
internalerror(10120);
end;
end;
end;
location.reference.symbol:=lab_real;
end;
{*****************************************************************************
TCGORDCONSTNODE
*****************************************************************************}
procedure tcgordconstnode.pass_generate_code;
begin
location_reset(location,LOC_CONSTANT,def_cgsize(resultdef));
{$ifdef cpu64bitalu}
location.value:=value.svalue;
{$else cpu64bitalu}
location.value64:=value.svalue;
{$endif cpu64bitalu}
end;
{*****************************************************************************
TCGPOINTERCONSTNODE
*****************************************************************************}
procedure tcgpointerconstnode.pass_generate_code;
begin
{ an integer const. behaves as a memory reference }
location_reset(location,LOC_CONSTANT,OS_ADDR);
location.value:=aint(value);
end;
{*****************************************************************************
TCGSTRINGCONSTNODE
*****************************************************************************}
procedure tcgstringconstnode.pass_generate_code;
var
lastlabel: tasmlabofs;
pc: pchar;
l: longint;
pool: THashSet;
entry: PHashSetItem;
winlikewidestring: boolean;
elementdef: tdef;
strpointerdef: tdef;
datatcb: ttai_typedconstbuilder;
datadef: tdef;
const
PoolMap: array[tconststringtype] of TConstPoolType = (
sp_conststr,
sp_shortstr,
sp_longstr,
sp_ansistr,
sp_widestr,
sp_unicodestr
);
begin
case cst_type of
cst_shortstring,
cst_conststring,
cst_ansistring:
begin
elementdef:=cansichartype;
strpointerdef:=charpointertype;
end;
cst_widestring,
cst_unicodestring:
begin
elementdef:=cwidechartype;
strpointerdef:=widecharpointertype;
end;
else
internalerror(2014032803);
end;
{ for empty ansistrings we could return a constant 0 }
if (cst_type in [cst_ansistring,cst_widestring,cst_unicodestring]) and (len=0) then
begin
location_reset(location,LOC_CONSTANT,def_cgsize(strpointerdef));
location.value:=0;
exit;
end;
winlikewidestring:=(cst_type=cst_widestring) and (tf_winlikewidestring in target_info.flags);
{ const already used ? }
if not assigned(lab_str) then
begin
pool := current_asmdata.ConstPools[PoolMap[cst_type]];
if cst_type in [cst_widestring, cst_unicodestring] then
entry := pool.FindOrAdd(pcompilerwidestring(value_str)^.data,len*cwidechartype.size)
else
if cst_type = cst_ansistring then
entry := PHashSetItem(TTagHashSet(pool).FindOrAdd(value_str,len,tstringdef(resultdef).encoding))
else
entry := pool.FindOrAdd(value_str,len);
lab_str := TAsmLabel(entry^.Data); // is it needed anymore?
{ :-(, we must generate a new entry }
if not assigned(entry^.Data) then
begin
datatcb:=ctai_typedconstbuilder.create([tcalo_is_lab,tcalo_make_dead_strippable,tcalo_apply_constalign]);
case cst_type of
cst_ansistring:
begin
if len=0 then
InternalError(2008032301) { empty string should be handled above }
else
begin
lastlabel:=datatcb.emit_ansistring_const(current_asmdata.AsmLists[al_typedconsts],value_str,len,tstringdef(resultdef).encoding);
{ because we hardcode the offset below due to it
not being stored in the hashset, check here }
if lastlabel.ofs<>datatcb.get_string_symofs(st_ansistring,false) then
internalerror(2012051703);
end;
{ no contents of the datatcb itself to concatenate,
as we will just return the address of the emitted
ansistring constant record }
end;
cst_unicodestring,
cst_widestring:
begin
if len=0 then
InternalError(2008032302) { empty string should be handled above }
else
begin
lastlabel:=datatcb.emit_unicodestring_const(current_asmdata.AsmLists[al_typedconsts],
value_str,
tstringdef(resultdef).encoding,
winlikewidestring);
{ because we hardcode the offset below due to it
not being stored in the hashset, check here }
if lastlabel.ofs<>datatcb.get_string_symofs(tstringdef(resultdef).stringtype,winlikewidestring) then
internalerror(2012051704);
end;
{ no contents of the datatcb itself to concatenate,
as we will just return the address of the emitted
unicode/widestring constant record }
end;
cst_shortstring:
begin
current_asmdata.getglobaldatalabel(lastlabel.lab);
{ truncate strings larger than 255 chars }
if len>255 then
l:=255
else
l:=len;
{ include length and terminating zero for quick conversion to pchar }
getmem(pc,l+2);
move(value_str^,pc[1],l);
pc[0]:=chr(l);
pc[l+1]:=#0;
datadef:=carraydef.getreusable(cansichartype,l+2);
datatcb.maybe_begin_aggregate(datadef);
datatcb.emit_tai(Tai_string.Create_pchar(pc,l+2),datadef);
datatcb.maybe_end_aggregate(datadef);
current_asmdata.asmlists[al_typedconsts].concatList(
datatcb.get_final_asmlist(lastlabel.lab,datadef,sec_rodata_norel,lastlabel.lab.name,const_align(sizeof(pint)))
);
end;
cst_conststring:
begin
current_asmdata.getglobaldatalabel(lastlabel.lab);
{ include terminating zero }
getmem(pc,len+1);
move(value_str^,pc[0],len);
pc[len]:=#0;
{ the data includes the terminating #0 because this
string can be used for pchar assignments (but it's
also used for array-of-char assignments, in which
case the terminating #0 is not part of the data) }
datadef:=carraydef.getreusable(cansichartype,len+1);
datatcb.maybe_begin_aggregate(datadef);
datatcb.emit_tai(Tai_string.Create_pchar(pc,len+1),datadef);
datatcb.maybe_end_aggregate(datadef);
current_asmdata.asmlists[al_typedconsts].concatList(
datatcb.get_final_asmlist(lastlabel.lab,datadef,sec_rodata_norel,lastlabel.lab.name,const_align(sizeof(pint)))
);
end;
else
internalerror(2013120103);
end;
datatcb.free;
lab_str:=lastlabel.lab;
entry^.Data:=lastlabel.lab;
end;
end;
if cst_type in [cst_ansistring, cst_widestring, cst_unicodestring] then
begin
location_reset(location, LOC_REGISTER, def_cgsize(strpointerdef));
location.register:=hlcg.getaddressregister(current_asmdata.CurrAsmList,strpointerdef);
load_dynstring(strpointerdef, elementdef, winlikewidestring);
end
else
begin
location_reset_ref(location, LOC_CREFERENCE, def_cgsize(resultdef), const_align(strpointerdef.size), []);
location.reference.symbol:=lab_str;
end;
end;
procedure tcgstringconstnode.load_dynstring(const strpointerdef: tdef; const elementdef: tdef; const winlikewidestring: boolean);
var
href: treference;
begin
reference_reset_symbol(href, lab_str,
ctai_typedconstbuilder.get_string_symofs(tstringdef(resultdef).stringtype, winlikewidestring),
const_align(strpointerdef.size),[]);
hlcg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList, elementdef, strpointerdef, href, location.register)
end;
{*****************************************************************************
TCGSETCONSTNODE
*****************************************************************************}
function tcgsetconstnode.emitvarsetconst: tasmsymbol;
type
setbytes=array[0..31] of byte;
Psetbytes=^setbytes;
var
lab: tasmlabel;
i: longint;
tcb: ttai_typedconstbuilder;
begin
current_asmdata.getglobaldatalabel(lab);
result:=lab;
lab_set:=lab;
tcb:=ctai_typedconstbuilder.create([tcalo_is_lab,tcalo_make_dead_strippable,tcalo_apply_constalign]);
tcb.maybe_begin_aggregate(resultdef);
if (source_info.endian=target_info.endian) then
for i:=0 to resultdef.size-1 do
tcb.emit_tai(tai_const.create_8bit(Psetbytes(value_set)^[i]),u8inttype)
else
for i:=0 to resultdef.size-1 do
tcb.emit_tai(tai_const.create_8bit(reverse_byte(Psetbytes(value_set)^[i])),u8inttype);
tcb.maybe_end_aggregate(resultdef);
current_asmdata.asmlists[al_typedconsts].concatlist(tcb.get_final_asmlist(
result,resultdef,sec_rodata_norel,result.name,const_align(8)));
tcb.free;
end;
procedure tcgsetconstnode.handlevarsetconst;
var
entry : PHashSetItem;
begin
location_reset_ref(location,LOC_CREFERENCE,OS_NO,const_align(8),[]);
{ const already used ? }
if not assigned(lab_set) then
begin
entry := current_asmdata.ConstPools[sp_varsets].FindOrAdd(value_set, resultdef.size);
{ :-(, we must generate a new entry }
if not assigned(entry^.Data) then
entry^.Data:=emitvarsetconst;
lab_set := TAsmSymbol(entry^.Data);
end;
location.reference.symbol:=lab_set;
end;
procedure tcgsetconstnode.pass_generate_code;
type
setbytes=array[0..31] of byte;
Psetbytes=^setbytes;
procedure smallsetconst;
begin
location_reset(location,LOC_CONSTANT,int_cgsize(resultdef.size));
if (source_info.endian=target_info.endian) then
begin
{ not plongint, because that will "sign extend" the set on 64 bit platforms }
{ if changed to "paword", please also modify "32-resultdef.size*8" and }
{ cross-endian code below }
{ Extra aint type cast to avoid range errors }
location.value:=aint(pCardinal(value_set)^)
end
else
begin
location.value:=aint(swapendian(Pcardinal(value_set)^));
location.value:=aint(
reverse_byte (location.value and $ff) or
(reverse_byte((location.value shr 8) and $ff) shl 8) or
(reverse_byte((location.value shr 16) and $ff) shl 16) or
(reverse_byte((location.value shr 24) and $ff) shl 24)
);
end;
if (target_info.endian=endian_big) then
location.value:=location.value shr (32-resultdef.size*8);
end;
begin
adjustforsetbase;
{ small sets are loaded as constants }
if is_smallset(resultdef) then
smallsetconst
else
handlevarsetconst;
end;
{*****************************************************************************
TCGNILNODE
*****************************************************************************}
procedure tcgnilnode.pass_generate_code;
begin
location_reset(location,LOC_CONSTANT,OS_ADDR);
location.value:=0;
end;
{*****************************************************************************
TCGGUIDCONSTNODE
*****************************************************************************}
procedure tcgguidconstnode.pass_generate_code;
var
lastlabel : tasmlabel;
entry : PHashSetItem;
datatcb : ttai_typedconstbuilder;
begin
location_reset_ref(location,LOC_CREFERENCE,OS_NO,const_align(16),[]);
lastlabel:=nil;
{ const already used ? }
if not assigned(lab_set) then
begin
entry:=current_asmdata.ConstPools[sp_guids].FindOrAdd(@value,sizeof(value));
lab_set:=TAsmLabel(entry^.Data); // is it needed anymore?
{ :-(, we must generate a new entry }
if not assigned(entry^.Data) then
begin
current_asmdata.getglobaldatalabel(lastlabel);
datatcb:=ctai_typedconstbuilder.create([tcalo_is_lab,tcalo_make_dead_strippable,tcalo_apply_constalign]);
datatcb.emit_guid_const(value);
current_asmdata.asmlists[al_typedconsts].concatList(
datatcb.get_final_asmlist(lastlabel,rec_tguid,sec_rodata_norel,lastlabel.name,const_align(16)));
datatcb.free;
lab_set:=lastlabel;
entry^.Data:=lastlabel;
end;
end;
location.reference.symbol:=lab_set;
end;
begin
crealconstnode:=tcgrealconstnode;
cordconstnode:=tcgordconstnode;
cpointerconstnode:=tcgpointerconstnode;
cstringconstnode:=tcgstringconstnode;
csetconstnode:=tcgsetconstnode;
cnilnode:=tcgnilnode;
cguidconstnode:=tcgguidconstnode;
end.
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