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|
{
Copyright (c) 2000-2002 by Florian Klaempfl
Type checking and register allocation for memory related nodes
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 nmem;
{$i fpcdefs.inc}
interface
uses
node,
symdef,symsym,symtable,symtype;
type
tloadvmtaddrnode = class(tunarynode)
{ unless this is for a call, we have to send the "class" message to
the objctype because the type information only gets initialized
after the first message has been sent -> crash if you pass an
uninitialized type to e.g. class_getInstanceSize() or so. No need
to save to/restore from ppu. }
forcall: boolean;
constructor create(l : tnode);virtual;
function pass_1 : tnode;override;
function pass_typecheck:tnode;override;
function docompare(p: tnode): boolean; override;
function dogetcopy: tnode; override;
end;
tloadvmtaddrnodeclass = class of tloadvmtaddrnode;
tloadparentfpkind = (
{ as parameter to a nested routine (current routine's frame) }
lpf_forpara,
{ to load a local from a parent routine in the current nested routine
(some parent routine's frame) }
lpf_forload
);
tloadparentfpnode = class(tunarynode)
parentpd : tprocdef;
parentpdderef : tderef;
kind: tloadparentfpkind;
constructor create(pd: tprocdef; fpkind: tloadparentfpkind);virtual;
constructor ppuload(t:tnodetype;ppufile:tcompilerppufile);override;
procedure ppuwrite(ppufile:tcompilerppufile);override;
procedure buildderefimpl;override;
procedure derefimpl;override;
function pass_1 : tnode;override;
function pass_typecheck:tnode;override;
function docompare(p: tnode): boolean; override;
function dogetcopy : tnode;override;
end;
tloadparentfpnodeclass = class of tloadparentfpnode;
taddrnodeflag = (
{ generated by the Ofs() internal function }
anf_ofs,
anf_typedaddr
);
taddrnodeflags = set of taddrnodeflag;
taddrnode = class(tunarynode)
getprocvardef : tprocvardef;
getprocvardefderef : tderef;
addrnodeflags : taddrnodeflags;
constructor create(l : tnode);virtual;
constructor create_internal(l : tnode); virtual;
constructor create_internal_nomark(l : tnode); virtual;
constructor ppuload(t:tnodetype;ppufile:tcompilerppufile);override;
procedure ppuwrite(ppufile:tcompilerppufile);override;
procedure mark_write;override;
procedure buildderefimpl;override;
procedure derefimpl;override;
procedure printnodeinfo(var t: text); override;
{$ifdef DEBUG_NODE_XML}
procedure XMLPrintNodeInfo(var T: Text); override;
{$endif DEBUG_NODE_XML}
function docompare(p: tnode): boolean; override;
function dogetcopy : tnode;override;
function pass_1 : tnode;override;
function pass_typecheck:tnode;override;
function simplify(forinline : boolean) : tnode; override;
protected
mark_read_written: boolean;
procedure set_labelsym_resultdef; virtual;
function typecheck_non_proc(realsource: tnode; out res: tnode): boolean; virtual;
end;
taddrnodeclass = class of taddrnode;
tderefnode = class(tunarynode)
constructor create(l : tnode);virtual;
function pass_1 : tnode;override;
function pass_typecheck:tnode;override;
procedure mark_write;override;
end;
tderefnodeclass = class of tderefnode;
tsubscriptnode = class(tunarynode)
vs : tfieldvarsym;
vsderef : tderef;
constructor create(varsym : tsym;l : tnode);virtual;
constructor ppuload(t:tnodetype;ppufile:tcompilerppufile);override;
procedure ppuwrite(ppufile:tcompilerppufile);override;
procedure buildderefimpl;override;
procedure derefimpl;override;
function dogetcopy : tnode;override;
function pass_1 : tnode;override;
function docompare(p: tnode): boolean; override;
function pass_typecheck:tnode;override;
procedure mark_write;override;
{$ifdef DEBUG_NODE_XML}
procedure XMLPrintNodeData(var T: Text); override;
{$endif DEBUG_NODE_XML}
end;
tsubscriptnodeclass = class of tsubscriptnode;
tvecnode = class(tbinarynode)
protected
function first_arraydef: tnode; virtual;
function gen_array_rangecheck: tnode; virtual;
public
constructor create(l,r : tnode);virtual;
function pass_1 : tnode;override;
function pass_typecheck:tnode;override;
procedure mark_write;override;
{$ifdef DEBUG_NODE_XML}
procedure XMLPrintNodeData(var T: Text); override;
{$endif DEBUG_NODE_XML}
end;
tvecnodeclass = class of tvecnode;
var
cloadvmtaddrnode : tloadvmtaddrnodeclass= tloadvmtaddrnode;
caddrnode : taddrnodeclass= taddrnode;
cderefnode : tderefnodeclass= tderefnode;
csubscriptnode : tsubscriptnodeclass= tsubscriptnode;
cvecnode : tvecnodeclass= tvecnode;
cloadparentfpnode : tloadparentfpnodeclass = tloadparentfpnode;
function is_big_untyped_addrnode(p: tnode): boolean;
implementation
uses
globtype,systems,constexp,
cutils,verbose,globals,ppu,
symconst,defutil,defcmp,
nadd,nbas,nflw,nutils,objcutil,
wpobase,
{$ifdef i8086}
cpuinfo,
{$endif i8086}
htypechk,pass_1,ncal,nld,ncon,ncnv,cgbase,procinfo
;
{*****************************************************************************
TLOADVMTADDRNODE
*****************************************************************************}
constructor tloadvmtaddrnode.create(l : tnode);
begin
inherited create(loadvmtaddrn,l);
end;
function tloadvmtaddrnode.pass_typecheck:tnode;
var
defaultresultdef : boolean;
begin
result:=nil;
typecheckpass(left);
if codegenerror then
exit;
case left.resultdef.typ of
classrefdef :
resultdef:=left.resultdef;
recorddef,
objectdef:
begin
if (left.resultdef.typ=objectdef) or
((target_info.system in systems_jvm) and
(left.resultdef.typ=recorddef)) then
begin
{ access to the classtype while specializing? }
if tstoreddef(left.resultdef).is_generic then
begin
defaultresultdef:=true;
if assigned(current_structdef) then
begin
if assigned(current_structdef.genericdef) then
if current_structdef.genericdef=left.resultdef then
begin
resultdef:=cclassrefdef.create(current_structdef);
defaultresultdef:=false;
end
else
CGMessage(parser_e_cant_create_generics_of_this_type);
end
else
message(parser_e_cant_create_generics_of_this_type);
if defaultresultdef then
resultdef:=cclassrefdef.create(left.resultdef);
end
else
resultdef:=cclassrefdef.create(left.resultdef);
end
else
CGMessage(parser_e_pointer_to_class_expected);
end
else
CGMessage(parser_e_pointer_to_class_expected);
end;
end;
function tloadvmtaddrnode.docompare(p: tnode): boolean;
begin
result:=inherited docompare(p);
if result then
result:=forcall=tloadvmtaddrnode(p).forcall;
end;
function tloadvmtaddrnode.dogetcopy: tnode;
begin
result:=inherited dogetcopy;
tloadvmtaddrnode(result).forcall:=forcall;
end;
function tloadvmtaddrnode.pass_1 : tnode;
var
vs: tsym;
begin
result:=nil;
expectloc:=LOC_REGISTER;
if left.nodetype<>typen then
begin
if (is_objc_class_or_protocol(left.resultdef) or
is_objcclassref(left.resultdef)) then
begin
{ on non-fragile ABI platforms, the ISA pointer may be opaque
and we must call Object_getClass to obtain the real ISA
pointer }
if target_info.system in systems_objc_nfabi then
begin
result:=ccallnode.createinternfromunit('OBJC','OBJECT_GETCLASS',ccallparanode.create(left,nil));
inserttypeconv_explicit(result,resultdef);
end
else
result:=objcloadbasefield(left,'ISA');
end
else
result:=ctypeconvnode.create_internal(load_vmt_for_self_node(left),resultdef);
{ reused }
left:=nil;
end
else if not is_objcclass(left.resultdef) and
not is_objcclassref(left.resultdef) then
begin
if not(nf_ignore_for_wpo in flags) and
(not assigned(current_procinfo) or
(po_inline in current_procinfo.procdef.procoptions) or
wpoinfomanager.symbol_live(current_procinfo.procdef.mangledname)) then
begin
{ keep track of which classes might be instantiated via a classrefdef }
if (left.resultdef.typ=classrefdef) then
tobjectdef(tclassrefdef(left.resultdef).pointeddef).register_maybe_created_object_type
else if (left.resultdef.typ=objectdef) then
tobjectdef(left.resultdef).register_maybe_created_object_type
end
end
else if is_objcclass(left.resultdef) and
not(forcall) then
begin
{ call "class" method (= "classclass" in FPC), because otherwise
we may use the class information before it has been
initialized }
vs:=search_struct_member(tobjectdef(left.resultdef),'CLASSCLASS');
if not assigned(vs) or
(vs.typ<>procsym) then
internalerror(2011080601);
{ can't reuse "self", because it will be freed when we return }
result:=ccallnode.create(nil,tprocsym(vs),vs.owner,self.getcopy,[],nil);
end;
end;
{*****************************************************************************
TLOADPARENTFPNODE
*****************************************************************************}
constructor tloadparentfpnode.create(pd: tprocdef; fpkind: tloadparentfpkind);
begin
inherited create(loadparentfpn,nil);
if not assigned(pd) then
internalerror(200309288);
if (pd.parast.symtablelevel>current_procinfo.procdef.parast.symtablelevel) then
internalerror(200309284);
parentpd:=pd;
kind:=fpkind;
end;
constructor tloadparentfpnode.ppuload(t:tnodetype;ppufile:tcompilerppufile);
begin
inherited ppuload(t,ppufile);
ppufile.getderef(parentpdderef);
kind:=tloadparentfpkind(ppufile.getbyte);
end;
procedure tloadparentfpnode.ppuwrite(ppufile:tcompilerppufile);
begin
inherited ppuwrite(ppufile);
ppufile.putderef(parentpdderef);
ppufile.putbyte(byte(kind));
end;
procedure tloadparentfpnode.buildderefimpl;
begin
inherited buildderefimpl;
parentpdderef.build(parentpd);
end;
procedure tloadparentfpnode.derefimpl;
begin
inherited derefimpl;
parentpd:=tprocdef(parentpdderef.resolve);
end;
function tloadparentfpnode.docompare(p: tnode): boolean;
begin
result:=
inherited docompare(p) and
(tloadparentfpnode(p).parentpd=parentpd) and
(tloadparentfpnode(p).kind=kind);
end;
function tloadparentfpnode.dogetcopy : tnode;
var
p : tloadparentfpnode;
begin
p:=tloadparentfpnode(inherited dogetcopy);
p.parentpd:=parentpd;
p.kind:=kind;
dogetcopy:=p;
end;
function tloadparentfpnode.pass_typecheck:tnode;
begin
result:=nil;
resultdef:=parentfpvoidpointertype;
end;
function tloadparentfpnode.pass_1 : tnode;
begin
result:=nil;
expectloc:=LOC_REGISTER;
end;
{*****************************************************************************
TADDRNODE
*****************************************************************************}
constructor taddrnode.create(l : tnode);
begin
inherited create(addrn,l);
getprocvardef:=nil;
addrnodeflags:=[];
mark_read_written := true;
end;
constructor taddrnode.create_internal(l : tnode);
begin
self.create(l);
include(flags,nf_internal);
end;
constructor taddrnode.create_internal_nomark(l : tnode);
begin
self.create_internal(l);
mark_read_written := false;
end;
constructor taddrnode.ppuload(t:tnodetype;ppufile:tcompilerppufile);
begin
inherited ppuload(t,ppufile);
ppufile.getderef(getprocvardefderef);
ppufile.getset(tppuset1(addrnodeflags));
end;
procedure taddrnode.ppuwrite(ppufile:tcompilerppufile);
begin
inherited ppuwrite(ppufile);
ppufile.putderef(getprocvardefderef);
ppufile.putset(tppuset1(addrnodeflags));
end;
procedure Taddrnode.mark_write;
begin
{@procvar:=nil is legal in Delphi mode.}
left.mark_write;
end;
procedure taddrnode.buildderefimpl;
begin
inherited buildderefimpl;
getprocvardefderef.build(getprocvardef);
end;
procedure taddrnode.derefimpl;
begin
inherited derefimpl;
getprocvardef:=tprocvardef(getprocvardefderef.resolve);
end;
procedure taddrnode.printnodeinfo(var t: text);
var
first: Boolean;
i: taddrnodeflag;
begin
inherited printnodeinfo(t);
write(t,', addrnodeflags = [');
first:=true;
for i:=low(taddrnodeflag) to high(taddrnodeflag) do
if i in addrnodeflags then
begin
if not first then
write(t,',')
else
first:=false;
write(t,i);
end;
write(t,']');
end;
{$ifdef DEBUG_NODE_XML}
procedure TAddrNode.XMLPrintNodeInfo(var T: Text);
var
First: Boolean;
i: TAddrNodeFlag;
begin
inherited XMLPrintNodeInfo(t);
First := True;
for i := Low(TAddrNodeFlag) to High(TAddrNodeFlag) do
if i in addrnodeflags then
begin
if First then
begin
Write(T, ' addrnodeflags="', i);
First := False;
end
else
Write(T, ',', i);
end;
if not First then
Write(T, '"');
end;
{$endif DEBUG_NODE_XML}
function taddrnode.docompare(p: tnode): boolean;
begin
result:=
inherited docompare(p) and
(taddrnode(p).getprocvardef=getprocvardef) and
(taddrnode(p).addrnodeflags=addrnodeflags);
end;
function taddrnode.dogetcopy : tnode;
var
p : taddrnode;
begin
p:=taddrnode(inherited dogetcopy);
p.getprocvardef:=getprocvardef;
p.addrnodeflags:=addrnodeflags;
dogetcopy:=p;
end;
function taddrnode.pass_typecheck:tnode;
procedure check_mark_read_written;
begin
if mark_read_written then
begin
{ This is actually only "read", but treat it nevertheless as
modified due to the possible use of pointers
To avoid false positives regarding "uninitialised"
warnings when using arrays, perform it in two steps }
set_varstate(left,vs_written,[]);
{ vsf_must_be_valid so it doesn't get changed into
vsf_referred_not_inited }
set_varstate(left,vs_read,[vsf_must_be_valid]);
end;
end;
var
hp : tnode;
hsym : tfieldvarsym;
isprocvar,need_conv_to_voidptr: boolean;
procpointertype: tdef;
begin
result:=nil;
typecheckpass(left);
if codegenerror then
exit;
make_not_regable(left,[ra_addr_regable,ra_addr_taken]);
{ don't allow constants, for internal use we also
allow taking the address of strings and sets }
if is_constnode(left) and
not(
(nf_internal in flags) and
(left.nodetype in [stringconstn,setconstn])
) then
begin
CGMessagePos(left.fileinfo,type_e_no_addr_of_constant);
exit;
end;
{ Handle @proc special, also @procvar in tp-mode needs
special handling }
if (left.resultdef.typ=procdef) or
(
{ in case of nf_internal, follow the normal FPC semantics so that
we can easily get the actual address of a procvar }
not(nf_internal in flags) and
(left.resultdef.typ=procvardef) and
((m_tp_procvar in current_settings.modeswitches) or
(m_mac_procvar in current_settings.modeswitches))
) then
begin
isprocvar:=(left.resultdef.typ=procvardef);
need_conv_to_voidptr:=
(m_tp_procvar in current_settings.modeswitches) or
(m_mac_procvar in current_settings.modeswitches);
if not isprocvar then
begin
left:=ctypeconvnode.create_proc_to_procvar(left);
if need_conv_to_voidptr then
include(ttypeconvnode(left).convnodeflags,tcnf_proc_2_procvar_2_voidpointer);
if anf_ofs in addrnodeflags then
include(ttypeconvnode(left).convnodeflags,tcnf_proc_2_procvar_get_offset_only);
left.fileinfo:=fileinfo;
typecheckpass(left);
end;
{ In tp procvar mode the result is always a voidpointer. Insert
a typeconversion to voidpointer. For methodpointers we need
to load the proc field }
if need_conv_to_voidptr then
begin
if tabstractprocdef(left.resultdef).is_addressonly then
begin
if anf_ofs in addrnodeflags then
result:=ctypeconvnode.create_internal(left,tabstractprocdef(left.resultdef).ofs_address_type)
else
result:=ctypeconvnode.create_internal(left,voidcodepointertype);
include(result.flags,nf_load_procvar);
left:=nil;
end
else
begin
{ For procvars and for nested routines we need to return
the proc field of the methodpointer }
if isprocvar or
is_nested_pd(tabstractprocdef(left.resultdef)) then
begin
if tabstractprocdef(left.resultdef).is_methodpointer then
procpointertype:=methodpointertype
else
procpointertype:=nestedprocpointertype;
{ find proc field in methodpointer record }
hsym:=tfieldvarsym(trecorddef(procpointertype).symtable.Find('proc'));
if not assigned(hsym) then
internalerror(200412041);
{ Load tmehodpointer(left).proc }
result:=csubscriptnode.create(
hsym,
ctypeconvnode.create_internal(left,procpointertype));
left:=nil;
end
else
CGMessage(type_e_variable_id_expected);
end;
end
else
begin
check_mark_read_written;
{ Return the typeconvn only }
result:=left;
left:=nil;
exit;
end;
end
else
begin
hp:=left;
while assigned(hp) and (hp.nodetype in [typeconvn,derefn,subscriptn]) do
hp:=tunarynode(hp).left;
if not assigned(hp) then
internalerror(200412042);
if typecheck_non_proc(hp,result) then
begin
if assigned(result) then
exit;
end
else
CGMessage(type_e_variable_id_expected);
end;
check_mark_read_written;
if not(assigned(result)) then
result:=simplify(false);
end;
function taddrnode.simplify(forinline : boolean) : tnode;
var
hsym : tfieldvarsym;
begin
result:=nil;
if ((left.nodetype=subscriptn) and
(tsubscriptnode(left).left.nodetype=derefn) and
(tsubscriptnode(left).left.resultdef.typ=recorddef) and
(tderefnode(tsubscriptnode(left).left).left.nodetype=niln)) or
((left.nodetype=subscriptn) and
(tsubscriptnode(left).left.nodetype=typeconvn) and
(tsubscriptnode(left).left.resultdef.typ=recorddef) and
(ttypeconvnode(tsubscriptnode(left).left).left.nodetype=derefn) and
(tderefnode(ttypeconvnode(tsubscriptnode(left).left).left).left.nodetype=niln)) then
begin
hsym:=tsubscriptnode(left).vs;
if tabstractrecordsymtable(hsym.owner).is_packed then
result:=cpointerconstnode.create(hsym.fieldoffset div 8,resultdef)
else
result:=cpointerconstnode.create(hsym.fieldoffset,resultdef);
end;
end;
procedure taddrnode.set_labelsym_resultdef;
begin
resultdef:=voidcodepointertype;
end;
function taddrnode.typecheck_non_proc(realsource: tnode; out res: tnode): boolean;
var
hp : tnode;
hsym : tfieldvarsym;
offset: asizeint;
begin
result:=false;
res:=nil;
if (realsource.nodetype=loadn) and
(tloadnode(realsource).symtableentry.typ=labelsym) then
begin
set_labelsym_resultdef;
result:=true;
end
else if (realsource.nodetype=loadn) and
(tloadnode(realsource).symtableentry.typ=absolutevarsym) and
(tabsolutevarsym(tloadnode(realsource).symtableentry).abstyp=toaddr) then
begin
offset:=tabsolutevarsym(tloadnode(realsource).symtableentry).addroffset;
hp:=left;
while assigned(hp)and(hp.nodetype=subscriptn) do
begin
hsym:=tsubscriptnode(hp).vs;
if tabstractrecordsymtable(hsym.owner).is_packed then
begin
{ can't calculate the address of a non-byte aligned field }
if (hsym.fieldoffset mod 8)<>0 then
begin
CGMessagePos(hp.fileinfo,parser_e_packed_element_no_var_addr);
exit
end;
inc(offset,hsym.fieldoffset div 8)
end
else
inc(offset,hsym.fieldoffset);
hp:=tunarynode(hp).left;
end;
if anf_typedaddr in addrnodeflags then
res:=cpointerconstnode.create(offset,cpointerdef.getreusable(left.resultdef))
else
res:=cpointerconstnode.create(offset,voidpointertype);
result:=true;
end
else if (nf_internal in flags) or
valid_for_addr(left,true) then
begin
if not(anf_typedaddr in addrnodeflags) then
resultdef:=voidpointertype
else
resultdef:=cpointerdef.getreusable(left.resultdef);
result:=true;
end
end;
function taddrnode.pass_1 : tnode;
begin
result:=nil;
firstpass(left);
if codegenerror then
exit;
{ is this right for object of methods ?? }
expectloc:=LOC_REGISTER;
end;
{*****************************************************************************
TDEREFNODE
*****************************************************************************}
constructor tderefnode.create(l : tnode);
begin
inherited create(derefn,l);
end;
function tderefnode.pass_typecheck:tnode;
begin
result:=nil;
typecheckpass(left);
set_varstate(left,vs_read,[vsf_must_be_valid]);
if codegenerror then
exit;
{ tp procvar support }
maybe_call_procvar(left,true);
if left.resultdef.typ=pointerdef then
resultdef:=tpointerdef(left.resultdef).pointeddef
else if left.resultdef.typ=undefineddef then
resultdef:=cundefineddef.create(true)
else
CGMessage(parser_e_invalid_qualifier);
end;
procedure Tderefnode.mark_write;
begin
include(flags,nf_write);
end;
function tderefnode.pass_1 : tnode;
begin
result:=nil;
firstpass(left);
if codegenerror then
exit;
expectloc:=LOC_REFERENCE;
end;
{*****************************************************************************
TSUBSCRIPTNODE
*****************************************************************************}
constructor tsubscriptnode.create(varsym : tsym;l : tnode);
begin
inherited create(subscriptn,l);
{ vs should be changed to tsym! }
vs:=tfieldvarsym(varsym);
end;
constructor tsubscriptnode.ppuload(t:tnodetype;ppufile:tcompilerppufile);
begin
inherited ppuload(t,ppufile);
ppufile.getderef(vsderef);
end;
procedure tsubscriptnode.ppuwrite(ppufile:tcompilerppufile);
begin
inherited ppuwrite(ppufile);
ppufile.putderef(vsderef);
end;
procedure tsubscriptnode.buildderefimpl;
begin
inherited buildderefimpl;
vsderef.build(vs);
end;
procedure tsubscriptnode.derefimpl;
begin
inherited derefimpl;
vs:=tfieldvarsym(vsderef.resolve);
end;
function tsubscriptnode.dogetcopy : tnode;
var
p : tsubscriptnode;
begin
p:=tsubscriptnode(inherited dogetcopy);
p.vs:=vs;
dogetcopy:=p;
end;
function tsubscriptnode.pass_typecheck:tnode;
begin
result:=nil;
typecheckpass(left);
{ tp procvar support }
maybe_call_procvar(left,true);
resultdef:=vs.vardef;
// don't put records from which we load float fields
// in integer registers
if (left.resultdef.typ=recorddef) and
(resultdef.typ=floatdef) then
make_not_regable(left,[ra_addr_regable]);
end;
procedure Tsubscriptnode.mark_write;
begin
include(flags,nf_write);
{ if an element of a record is written, then the whole record is changed/it is written to it,
for data types being implicit pointers this does not apply as the object itself does not change }
if not(is_implicit_pointer_object_type(left.resultdef)) then
left.mark_write;
end;
function tsubscriptnode.pass_1 : tnode;
begin
result:=nil;
firstpass(left);
if codegenerror then
exit;
{ several object types must be dereferenced implicitly }
if is_implicit_pointer_object_type(left.resultdef) then
expectloc:=LOC_REFERENCE
else
begin
case left.expectloc of
{ if a floating point value is casted into a record, it
can happen that we get here an fpu or mm register }
LOC_CMMREGISTER,
LOC_CFPUREGISTER,
LOC_MMREGISTER,
LOC_FPUREGISTER,
LOC_CONSTANT,
LOC_REGISTER,
LOC_SUBSETREG:
// can happen for function results on win32 and darwin/x86
if (left.resultdef.size > sizeof(pint)) then
expectloc:=LOC_REFERENCE
else
expectloc:=LOC_SUBSETREG;
LOC_CREGISTER,
LOC_CSUBSETREG:
expectloc:=LOC_CSUBSETREG;
LOC_REFERENCE,
LOC_CREFERENCE:
expectloc:=left.expectloc;
else internalerror(20060521);
end;
end;
end;
function tsubscriptnode.docompare(p: tnode): boolean;
begin
docompare :=
inherited docompare(p) and
(vs = tsubscriptnode(p).vs);
end;
{$ifdef DEBUG_NODE_XML}
procedure TSubscriptNode.XMLPrintNodeData(var T: Text);
begin
inherited XMLPrintNodeData(T);
WriteLn(T, PrintNodeIndention, '<field>', vs.Name, '</field>');
end;
{$endif DEBUG_NODE_XML}
{*****************************************************************************
TVECNODE
*****************************************************************************}
constructor tvecnode.create(l,r : tnode);
begin
inherited create(vecn,l,r);
end;
function tvecnode.pass_typecheck:tnode;
var
htype,elementdef,elementptrdef : tdef;
newordtyp: tordtype;
valid : boolean;
begin
result:=nil;
typecheckpass(left);
typecheckpass(right);
{ implicitly convert stringconstant to stringdef,
see tbs/tb0476.pp for a test }
if (left.nodetype=stringconstn) and
(tstringconstnode(left).cst_type=cst_conststring) then
begin
if tstringconstnode(left).len>255 then
inserttypeconv(left,getansistringdef)
else
inserttypeconv(left,cshortstringtype);
end;
{ In p[1] p is always valid, it is not possible to
declared a shortstring or normal array that has
undefined number of elements. Dynamic array and
ansi/widestring needs to be valid }
valid:=is_dynamic_array(left.resultdef) or
is_ansistring(left.resultdef) or
is_wide_or_unicode_string(left.resultdef) or
{ implicit pointer dereference -> pointer is read }
(left.resultdef.typ = pointerdef);
if valid then
set_varstate(left,vs_read,[vsf_must_be_valid]);
{
A vecn is, just like a loadn, always part of an expression with its
own read/write and must_be_valid semantics. Therefore we don't have
to do anything else here, just like for loadn's
}
set_varstate(right,vs_read,[vsf_must_be_valid]);
if codegenerror then
exit;
{ maybe type conversion for the index value, but
do not convert range nodes }
if (right.nodetype<>rangen) then
case left.resultdef.typ of
arraydef:
begin
htype:=Tarraydef(left.resultdef).rangedef;
if ado_isvariant in Tarraydef(left.resultdef).arrayoptions then
{Variant arrays are a special array, can have negative indexes and would therefore
need s32bit. However, they should not appear in a vecn, as they are handled in
handle_variantarray in pexpr.pas. Therefore, encountering a variant array is an
internal error... }
internalerror(200707031)
{ open array and array constructor range checking is handled
below at the node level, where the validity of the index
will be checked -> use a regular type conversion to either
the signed or unsigned native int type to prevent another
range check from getting inserted here (unless the type is
larger than the int type). Exception: if it's an ordinal
constant, because then this check should be performed at
compile time }
else if is_open_array(left.resultdef) or
is_array_constructor(left.resultdef) then
begin
if is_signed(right.resultdef) and
not is_constnode(right) then
inserttypeconv(right,sizesinttype)
else
inserttypeconv(right,sizeuinttype)
end
else if is_special_array(left.resultdef) then
{Arrays without a high bound (dynamic arrays, open arrays) are zero based,
convert indexes into these arrays to aword.}
inserttypeconv(right,uinttype)
{ note: <> rather than </>, because indexing e.g. an array 0..0
must not result in truncating the indexing value from 2/4/8
bytes to 1 byte (with range checking off, the full index
value must be used) }
else if (htype.typ=enumdef) and
(right.resultdef.typ=enumdef) and
(tenumdef(htype).basedef=tenumdef(right.resultdef).basedef) and
((tarraydef(left.resultdef).lowrange<>tenumdef(htype).min) or
(tarraydef(left.resultdef).highrange<>tenumdef(htype).max)) then
{Convert array indexes to low_bound..high_bound.}
inserttypeconv(right,cenumdef.create_subrange(tenumdef(right.resultdef),
asizeint(Tarraydef(left.resultdef).lowrange),
asizeint(Tarraydef(left.resultdef).highrange)
))
else if (htype.typ=orddef) and
{ right can also be a variant or another type with
overloaded assignment }
(right.resultdef.typ=orddef) and
{ don't try to create boolean types with custom ranges }
not is_boolean(right.resultdef) and
{ ordtype determines the size of the loaded value -> make
sure we don't truncate }
((Torddef(right.resultdef).ordtype<>torddef(htype).ordtype) or
(tarraydef(left.resultdef).lowrange<>torddef(htype).low) or
(tarraydef(left.resultdef).highrange<>torddef(htype).high)) then
{Convert array indexes to low_bound..high_bound.}
begin
if (right.resultdef.typ=orddef)
{$ifndef cpu64bitaddr}
{ do truncate 64 bit values on 32 bit cpus, since
a) the arrays cannot be > 32 bit anyway
b) their code generators can't directly handle 64 bit
loads
}
and not is_64bit(right.resultdef)
{$endif not cpu64bitaddr}
then
newordtyp:=Torddef(right.resultdef).ordtype
else
newordtyp:=torddef(sizesinttype).ordtype;
inserttypeconv(right,corddef.create(newordtyp,
int64(Tarraydef(left.resultdef).lowrange),
int64(Tarraydef(left.resultdef).highrange),
true
))
end
else
inserttypeconv(right,htype)
end;
stringdef:
if is_open_string(left.resultdef) then
inserttypeconv(right,u8inttype)
else if is_shortstring(left.resultdef) then
{Convert shortstring indexes to 0..length.}
inserttypeconv(right,corddef.create(u8bit,0,int64(Tstringdef(left.resultdef).len),true))
else
{Convert indexes into dynamically allocated strings to aword.}
inserttypeconv(right,uinttype);
pointerdef:
inserttypeconv(right,tpointerdef(left.resultdef).pointer_arithmetic_int_type);
else
{Others, (are there any?) indexes to aint.}
inserttypeconv(right,sinttype);
end;
{ although we never put regular arrays or shortstrings in registers,
it's possible that another type was typecasted to a small record
that has a field of one of these types -> in that case the record
can't be a regvar either }
if ((left.resultdef.typ=arraydef) and
not is_special_array(left.resultdef) and
{ arrays with elements equal to the alu size and with a constant index can be kept in register }
not(is_constnode(right) and (tarraydef(left.resultdef).elementdef.size=alusinttype.size))) or
((left.resultdef.typ=stringdef) and
(tstringdef(left.resultdef).stringtype in [st_shortstring,st_longstring])) then
make_not_regable(left,[ra_addr_regable]);
case left.resultdef.typ of
arraydef :
begin
{ check type of the index value }
if (compare_defs(right.resultdef,tarraydef(left.resultdef).rangedef,right.nodetype)=te_incompatible) then
IncompatibleTypes(right.resultdef,tarraydef(left.resultdef).rangedef);
if right.nodetype=rangen then
resultdef:=left.resultdef
else
resultdef:=Tarraydef(left.resultdef).elementdef;
result:=gen_array_rangecheck;
if assigned(result) then
exit;
{ in case of a bitpacked array of enums that are size 2 (due to
packenum 2) but whose values all fit in one byte, the size of
bitpacked array elements will be 1 byte while the resultdef of
will currently say it's two bytes) -> create a temp enumdef
with packenum=1 for the resultdef as subtype of the main
enumdef }
if is_enum(resultdef) and
is_packed_array(left.resultdef) and
((tarraydef(left.resultdef).elepackedbitsize div 8) <> resultdef.size) then
begin
resultdef:=cenumdef.create_subrange(tenumdef(resultdef),tenumdef(resultdef).min,tenumdef(resultdef).max);
tenumdef(resultdef).calcsavesize(1);
end
end;
pointerdef :
begin
{ are we accessing a pointer[], then convert the pointer to
an array first, in FPC this is allowed for all pointers
(except voidpointer) in delphi/tp7 it's only allowed for pchars. }
if not is_voidpointer(left.resultdef) and
(
(cs_pointermath in current_settings.localswitches) or
tpointerdef(left.resultdef).has_pointer_math or
is_pchar(left.resultdef) or
is_pwidechar(left.resultdef)
) then
begin
{ convert pointer to array }
htype:=carraydef.create_from_pointer(tpointerdef(left.resultdef));
inserttypeconv(left,htype);
if right.nodetype=rangen then
resultdef:=htype
else
resultdef:=tarraydef(htype).elementdef;
end
else
CGMessage(type_e_array_required);
end;
stringdef :
begin
case tstringdef(left.resultdef).stringtype of
st_unicodestring,
st_widestring :
begin
elementdef:=cwidechartype;
elementptrdef:=widecharpointertype;
end;
st_ansistring,
st_longstring,
st_shortstring :
begin
elementdef:=cansichartype;
elementptrdef:=charpointertype;
end;
end;
if right.nodetype=rangen then
begin
htype:=carraydef.create_from_pointer(tpointerdef(elementptrdef));
resultdef:=htype;
end
else
begin
{ indexed access to 0 element is only allowed for shortstrings or if
zero based strings is turned on }
if (right.nodetype=ordconstn) and
(Tordconstnode(right).value.svalue=0) and
not is_shortstring(left.resultdef) and
not(cs_zerobasedstrings in current_settings.localswitches) then
CGMessage(cg_e_can_access_element_zero);
resultdef:=elementdef;
end;
end;
variantdef :
resultdef:=cvarianttype;
else
CGMessage(type_e_array_required);
end;
end;
procedure Tvecnode.mark_write;
begin
include(flags,nf_write);
{ see comment in tsubscriptnode.mark_write }
if not(is_implicit_array_pointer(left.resultdef)) then
left.mark_write;
end;
function tvecnode.pass_1 : tnode;
begin
result:=nil;
firstpass(left);
firstpass(right);
if codegenerror then
exit;
if (nf_callunique in flags) and
(is_ansistring(left.resultdef) or
is_unicodestring(left.resultdef) or
(is_widestring(left.resultdef) and not(tf_winlikewidestring in target_info.flags))) then
begin
left := ctypeconvnode.create_internal(ccallnode.createintern('fpc_'+tstringdef(left.resultdef).stringtypname+'_unique',
ccallparanode.create(
ctypeconvnode.create_internal(left,voidpointertype),nil)),
left.resultdef);
firstpass(left);
{ double resultdef passes somwhere else may cause this to be }
{ reset though :/ }
exclude(flags,nf_callunique);
end
else if is_widestring(left.resultdef) and (tf_winlikewidestring in target_info.flags) then
exclude(flags,nf_callunique);
{ a range node as array index can only appear in function calls, and
those convert the range node into something else in
tcallnode.gen_high_tree }
if (right.nodetype=rangen) then
CGMessagePos(right.fileinfo,parser_e_illegal_expression)
else if left.resultdef.typ=arraydef then
result:=first_arraydef
else
begin
if left.expectloc=LOC_CREFERENCE then
expectloc:=LOC_CREFERENCE
else
expectloc:=LOC_REFERENCE
end;
end;
function tvecnode.first_arraydef: tnode;
begin
result:=nil;
if (not is_packed_array(left.resultdef)) or
((tarraydef(left.resultdef).elepackedbitsize mod 8) = 0) then
if left.expectloc=LOC_CREFERENCE then
expectloc:=LOC_CREFERENCE
else
expectloc:=LOC_REFERENCE
else
if left.expectloc=LOC_CREFERENCE then
expectloc:=LOC_CSUBSETREF
else
expectloc:=LOC_SUBSETREF;
end;
function tvecnode.gen_array_rangecheck: tnode;
var
htype: tdef;
temp: ttempcreatenode;
stat: tstatementnode;
indextree: tnode;
hightree: tnode;
begin
result:=nil;
{ Range checking an array of const/open array/dynamic array is
more complicated than regular arrays, because the bounds must
be checked dynamically. Additionally, in case of array of const
and open array we need the high parameter, which must not be
made a regvar in case this is a nested rountine relative to the
array parameter -> generate te check at the node tree level
rather than in the code generator }
if (cs_check_range in current_settings.localswitches) and
(is_open_array(left.resultdef) or
is_array_of_const(left.resultdef)) and
(right.nodetype<>rangen) then
begin
{ expect to find the load node }
if get_open_const_array(left).nodetype<>loadn then
internalerror(2014040601);
{ cdecl functions don't have high() so we can not check the range }
{ (can't use current_procdef, since it may be a nested procedure) }
if not(tprocdef(tparasymtable(tparavarsym(tloadnode(get_open_const_array(left)).symtableentry).owner).defowner).proccalloption in cdecl_pocalls) then
begin
temp:=nil;
result:=internalstatements(stat);
{ can't use node_complexity here, assumes that the code has
already been firstpassed }
if not is_const(right) then
begin
temp:=ctempcreatenode.create(right.resultdef,right.resultdef.size,tt_persistent,true);
addstatement(stat,temp);
{ needed so we can typecheck its temprefnodes }
typecheckpass(tnode(temp));
addstatement(stat,cassignmentnode.create(
ctemprefnode.create(temp),right)
);
right:=ctemprefnode.create(temp);
{ right.resultdef is used below }
typecheckpass(right);
end;
{ range check will be made explicit here }
exclude(localswitches,cs_check_range);
hightree:=load_high_value_node(tparavarsym(tloadnode(
get_open_const_array(left)).symtableentry));
{ make index unsigned so we only need one comparison;
lower bound is always zero for these arrays, but
hightree can be -1 in case the array was empty ->
add 1 before comparing (ignoring overflows) }
htype:=get_unsigned_inttype(right.resultdef);
inserttypeconv_explicit(hightree,htype);
hightree:=caddnode.create(addn,hightree,genintconstnode(1));
hightree.localswitches:=hightree.localswitches-[cs_check_range,
cs_check_overflow];
indextree:=ctypeconvnode.create_explicit(right.getcopy,htype);
{ range error if index >= hightree+1 }
addstatement(stat,
cifnode.create_internal(
caddnode.create_internal(gten,indextree,hightree),
ccallnode.createintern('fpc_rangeerror',nil),
nil
)
);
if assigned(temp) then
addstatement(stat,ctempdeletenode.create_normal_temp(temp));
addstatement(stat,self.getcopy);
end;
end;
end;
{$ifdef DEBUG_NODE_XML}
procedure TVecNode.XMLPrintNodeData(var T: Text);
begin
XMLPrintNode(T, Left);
{ The right node is the index }
WriteLn(T, PrintNodeIndention, '<index>');
PrintNodeIndent;
XMLPrintNode(T, Right);
PrintNodeUnindent;
WriteLn(T, PrintNodeIndention, '</index>');
PrintNodeUnindent;
WriteLn(T, PrintNodeIndention, '</', nodetype2str[nodetype], '>');
end;
{$endif DEBUG_NODE_XML}
function is_big_untyped_addrnode(p: tnode): boolean;
begin
is_big_untyped_addrnode:=(p.nodetype=addrn) and
not (anf_typedaddr in taddrnode(p).addrnodeflags) and
(taddrnode(p).left.resultdef.size > 1);
end;
end.
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