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fpc/compiler/ncgmem.pas
Jonas Maebe a23630260b + "weakexternal" support for imported procedures and variables. 
the syntax is exactly the same as for "external", except for
    the keyword. It is currently only active for Darwin targets.
    It should also work at least for Linux targets, but only with
    the GNU assembler (which is why it is not activated there)
  + test for this functionality

git-svn-id: trunk@12009 -
2008-11-01 18:38:32 +00:00

1004 lines
44 KiB
ObjectPascal
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{
Copyright (c) 1998-2002 by Florian Klaempfl
Generate assembler for memory related 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 ncgmem;
{$i fpcdefs.inc}
interface
uses
globtype,cgbase,cpuinfo,cpubase,
node,nmem;
type
tcgloadvmtaddrnode = class(tloadvmtaddrnode)
procedure pass_generate_code;override;
end;
tcgloadparentfpnode = class(tloadparentfpnode)
procedure pass_generate_code;override;
end;
tcgaddrnode = class(taddrnode)
procedure pass_generate_code;override;
end;
tcgderefnode = class(tderefnode)
procedure pass_generate_code;override;
end;
tcgsubscriptnode = class(tsubscriptnode)
procedure pass_generate_code;override;
end;
tcgwithnode = class(twithnode)
procedure pass_generate_code;override;
end;
tcgvecnode = class(tvecnode)
function get_mul_size : aint;
private
procedure rangecheck_array;
protected
{# This routine is used to calculate the address of the reference.
On entry reg contains the index in the array,
and l contains the size of each element in the array.
This routine should update location.reference correctly,
so it points to the correct address.
}
procedure update_reference_reg_mul(maybe_const_reg:tregister;l:aint);virtual;
procedure update_reference_reg_packed(maybe_const_reg:tregister;l:aint);virtual;
procedure second_wideansistring;virtual;
procedure second_dynamicarray;virtual;
public
procedure pass_generate_code;override;
end;
implementation
uses
systems,
cutils,verbose,globals,constexp,
symconst,symdef,symsym,symtable,defutil,paramgr,
aasmbase,aasmtai,aasmdata,
procinfo,pass_2,parabase,
pass_1,nld,ncon,nadd,nutils,
cgutils,cgobj,
tgobj,ncgutil
;
{*****************************************************************************
TCGLOADVMTADDRNODE
*****************************************************************************}
procedure tcgloadvmtaddrnode.pass_generate_code;
var
href : treference;
begin
location_reset(location,LOC_REGISTER,OS_ADDR);
if (left.nodetype=typen) then
begin
reference_reset_symbol(href,
current_asmdata.RefAsmSymbol(tobjectdef(tclassrefdef(resultdef).pointeddef).vmt_mangledname),0);
location.register:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList,href,location.register);
end
else
begin
{ left contains self, load vmt from self }
secondpass(left);
gen_load_vmt_register(current_asmdata.CurrAsmList,tobjectdef(left.resultdef),left.location,location.register);
end;
end;
{*****************************************************************************
TCGLOADPARENTFPNODE
*****************************************************************************}
procedure tcgloadparentfpnode.pass_generate_code;
var
currpi : tprocinfo;
hsym : tparavarsym;
href : treference;
begin
if (current_procinfo.procdef.parast.symtablelevel=parentpd.parast.symtablelevel) then
begin
location_reset(location,LOC_REGISTER,OS_ADDR);
location.register:=current_procinfo.framepointer;
end
else
begin
currpi:=current_procinfo;
location_reset(location,LOC_REGISTER,OS_ADDR);
location.register:=cg.getaddressregister(current_asmdata.CurrAsmList);
{ load framepointer of current proc }
hsym:=tparavarsym(currpi.procdef.parast.Find('parentfp'));
if not assigned(hsym) then
internalerror(200309281);
cg.a_load_loc_reg(current_asmdata.CurrAsmList,OS_ADDR,hsym.localloc,location.register);
{ walk parents }
while (currpi.procdef.owner.symtablelevel>parentpd.parast.symtablelevel) do
begin
currpi:=currpi.parent;
if not assigned(currpi) then
internalerror(200311201);
hsym:=tparavarsym(currpi.procdef.parast.Find('parentfp'));
if not assigned(hsym) then
internalerror(200309282);
if hsym.localloc.loc<>LOC_REFERENCE then
internalerror(200309283);
reference_reset_base(href,location.register,hsym.localloc.reference.offset);
cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,href,location.register);
end;
end;
end;
{*****************************************************************************
TCGADDRNODE
*****************************************************************************}
procedure tcgaddrnode.pass_generate_code;
begin
secondpass(left);
location_reset(location,LOC_REGISTER,OS_ADDR);
location.register:=cg.getaddressregister(current_asmdata.CurrAsmList);
if not(left.location.loc in [LOC_REFERENCE,LOC_CREFERENCE]) then
internalerror(2006111510);
cg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList,left.location.reference,location.register);
end;
{*****************************************************************************
TCGDEREFNODE
*****************************************************************************}
procedure tcgderefnode.pass_generate_code;
var
paraloc1 : tcgpara;
begin
secondpass(left);
location_reset(location,LOC_REFERENCE,def_cgsize(resultdef));
case left.location.loc of
LOC_CREGISTER,
LOC_REGISTER:
begin
maybechangeloadnodereg(current_asmdata.CurrAsmList,left,true);
{$ifdef cpu_uses_separate_address_registers}
if getregtype(left.location.register)<>R_ADDRESSREGISTER then
begin
location.reference.base := cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_load_reg_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,left.location.register,
location.reference.base);
end
else
{$endif}
location.reference.base := left.location.register;
end;
LOC_CREFERENCE,
LOC_REFERENCE:
begin
location.reference.base:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_load_loc_reg(current_asmdata.CurrAsmList,OS_ADDR,left.location,location.reference.base);
end;
LOC_CONSTANT:
begin
location.reference.offset:=left.location.value;
end;
else
internalerror(200507031);
end;
if (cs_use_heaptrc in current_settings.globalswitches) and
(cs_checkpointer in current_settings.localswitches) and
not(cs_compilesystem in current_settings.moduleswitches) and
not(tpointerdef(left.resultdef).is_far) and
not(nf_no_checkpointer in flags) then
begin
paraloc1.init;
paramanager.getintparaloc(pocall_default,1,paraloc1);
paramanager.allocparaloc(current_asmdata.CurrAsmList,paraloc1);
cg.a_param_reg(current_asmdata.CurrAsmList, OS_ADDR,location.reference.base,paraloc1);
paramanager.freeparaloc(current_asmdata.CurrAsmList,paraloc1);
paraloc1.done;
cg.allocallcpuregisters(current_asmdata.CurrAsmList);
cg.a_call_name(current_asmdata.CurrAsmList,'FPC_CHECKPOINTER',false);
cg.deallocallcpuregisters(current_asmdata.CurrAsmList);
end;
end;
{*****************************************************************************
TCGSUBSCRIPTNODE
*****************************************************************************}
procedure tcgsubscriptnode.pass_generate_code;
var
paraloc1 : tcgpara;
sref: tsubsetreference;
begin
secondpass(left);
if codegenerror then
exit;
paraloc1.init;
{ classes and interfaces must be dereferenced implicit }
if is_class_or_interface(left.resultdef) then
begin
location_reset(location,LOC_REFERENCE,def_cgsize(resultdef));
case left.location.loc of
LOC_CREGISTER,
LOC_REGISTER:
begin
{$ifdef cpu_uses_separate_address_registers}
if getregtype(left.location.register)<>R_ADDRESSREGISTER then
begin
location.reference.base:=rg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_load_reg_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,
left.location.register,location.reference.base);
end
else
{$endif}
location.reference.base := left.location.register;
end;
LOC_CREFERENCE,
LOC_REFERENCE:
begin
location.reference.base:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_load_loc_reg(current_asmdata.CurrAsmList,OS_ADDR,left.location,location.reference.base);
end;
end;
{ implicit deferencing }
if (cs_use_heaptrc in current_settings.globalswitches) and
(cs_checkpointer in current_settings.localswitches) and
not(cs_compilesystem in current_settings.moduleswitches) then
begin
paramanager.getintparaloc(pocall_default,1,paraloc1);
paramanager.allocparaloc(current_asmdata.CurrAsmList,paraloc1);
cg.a_param_reg(current_asmdata.CurrAsmList, OS_ADDR,location.reference.base,paraloc1);
paramanager.freeparaloc(current_asmdata.CurrAsmList,paraloc1);
cg.allocallcpuregisters(current_asmdata.CurrAsmList);
cg.a_call_name(current_asmdata.CurrAsmList,'FPC_CHECKPOINTER',false);
cg.deallocallcpuregisters(current_asmdata.CurrAsmList);
end;
end
else if is_interfacecom(left.resultdef) then
begin
location_reset(location,LOC_REFERENCE,def_cgsize(resultdef));
tg.GetTempTyped(current_asmdata.CurrAsmList,left.resultdef,tt_normal,location.reference);
cg.a_load_loc_ref(current_asmdata.CurrAsmList,OS_ADDR,left.location,location.reference);
{ implicit deferencing also for interfaces }
if (cs_use_heaptrc in current_settings.globalswitches) and
(cs_checkpointer in current_settings.localswitches) and
not(cs_compilesystem in current_settings.moduleswitches) then
begin
paramanager.getintparaloc(pocall_default,1,paraloc1);
paramanager.allocparaloc(current_asmdata.CurrAsmList,paraloc1);
cg.a_param_reg(current_asmdata.CurrAsmList, OS_ADDR,location.reference.base,paraloc1);
paramanager.freeparaloc(current_asmdata.CurrAsmList,paraloc1);
cg.allocallcpuregisters(current_asmdata.CurrAsmList);
cg.a_call_name(current_asmdata.CurrAsmList,'FPC_CHECKPOINTER',false);
cg.deallocallcpuregisters(current_asmdata.CurrAsmList);
end;
end
else
begin
location_copy(location,left.location);
{ some abi's require that functions return (some) records in }
{ registers }
case location.loc of
LOC_REFERENCE,
LOC_CREFERENCE:
;
LOC_REGISTER,
LOC_CREGISTER:
begin
if (left.resultdef.size > sizeof(pint)) then
location_force_mem(current_asmdata.CurrAsmList,location)
else
begin
if (left.location.loc = LOC_REGISTER) then
location.loc := LOC_SUBSETREG
else
location.loc := LOC_CSUBSETREG;
location.size:=def_cgsize(resultdef);
location.sreg.subsetreg := left.location.register;
location.sreg.subsetregsize := left.location.size;
if not is_packed_record_or_object(left.resultdef) then
begin
if (target_info.endian = ENDIAN_BIG) then
location.sreg.startbit := (tcgsize2size[location.sreg.subsetregsize] - tcgsize2size[location.size] - vs.fieldoffset) * 8
else
location.sreg.startbit := (vs.fieldoffset * 8);
location.sreg.bitlen := tcgsize2size[location.size] * 8;
end
else
begin
location.sreg.bitlen := resultdef.packedbitsize;
if (target_info.endian = ENDIAN_BIG) then
location.sreg.startbit := (tcgsize2size[location.sreg.subsetregsize]*8 - location.sreg.bitlen) - vs.fieldoffset
else
location.sreg.startbit := vs.fieldoffset;
end;
end;
end;
LOC_SUBSETREG,
LOC_CSUBSETREG:
begin
location.size:=def_cgsize(resultdef);
if not is_packed_record_or_object(left.resultdef) then
begin
if (target_info.endian = ENDIAN_BIG) then
inc(location.sreg.startbit, (left.resultdef.size - tcgsize2size[location.size] - vs.fieldoffset) * 8)
else
inc(location.sreg.startbit, vs.fieldoffset * 8);
location.sreg.bitlen := tcgsize2size[location.size] * 8;
end
else
begin
location.sreg.bitlen := resultdef.packedbitsize;
if (target_info.endian = ENDIAN_BIG) then
inc(location.sreg.startbit, left.location.sreg.bitlen - location.sreg.bitlen - vs.fieldoffset)
else
inc(location.sreg.startbit, vs.fieldoffset);
end;
end;
else
internalerror(2006031901);
end;
end;
if (location.loc in [LOC_REFERENCE,LOC_CREFERENCE]) then
begin
if not is_packed_record_or_object(left.resultdef) then
begin
inc(location.reference.offset,vs.fieldoffset);
{$ifdef SUPPORT_UNALIGNED}
{ packed? }
if (vs.owner.defowner.typ in [recorddef,objectdef]) and
(tabstractrecordsymtable(vs.owner).usefieldalignment=1) then
location.reference.alignment:=1;
{$endif SUPPORT_UNALIGNED}
end
else if (vs.fieldoffset mod 8 = 0) and
(resultdef.packedbitsize mod 8 = 0) and
{ is different in case of e.g. packenum 2 and an enum }
{ which fits in 8 bits }
(resultdef.size*8 = resultdef.packedbitsize) then
begin
inc(location.reference.offset,vs.fieldoffset div 8);
if (resultdef.size*8 <> resultdef.packedbitsize) then
internalerror(2006082013);
{ packed records always have an alignment of 1 }
location.reference.alignment:=1;
end
else
begin
sref.ref:=location.reference;
sref.ref.alignment:=1;
sref.bitindexreg:=NR_NO;
inc(sref.ref.offset,vs.fieldoffset div 8);
sref.startbit:=vs.fieldoffset mod 8;
sref.bitlen:=resultdef.packedbitsize;
if (left.location.loc=LOC_REFERENCE) then
location.loc:=LOC_SUBSETREF
else
location.loc:=LOC_CSUBSETREF;
location.sref:=sref;
end;
{ also update the size of the location }
location.size:=def_cgsize(resultdef);
end;
paraloc1.done;
end;
{*****************************************************************************
TCGWITHNODE
*****************************************************************************}
procedure tcgwithnode.pass_generate_code;
begin
location_reset(location,LOC_VOID,OS_NO);
if assigned(left) then
secondpass(left);
end;
{*****************************************************************************
TCGVECNODE
*****************************************************************************}
function tcgvecnode.get_mul_size : aint;
begin
if nf_memindex in flags then
get_mul_size:=1
else
begin
if (left.resultdef.typ=arraydef) then
if not is_packed_array(left.resultdef) then
get_mul_size:=tarraydef(left.resultdef).elesize
else
get_mul_size:=tarraydef(left.resultdef).elepackedbitsize
else
get_mul_size:=resultdef.size;
end
end;
{ this routine must, like any other routine, not change the contents }
{ of base/index registers of references, as these may be regvars. }
{ The register allocator can coalesce one LOC_REGISTER being moved }
{ into another (as their live ranges won't overlap), but not a }
{ LOC_CREGISTER moved into a LOC_(C)REGISTER most of the time (as }
{ the live range of the LOC_CREGISTER will most likely overlap the }
{ the live range of the target LOC_(C)REGISTER) }
{ The passed register may be a LOC_CREGISTER as well. }
procedure tcgvecnode.update_reference_reg_mul(maybe_const_reg:tregister;l:aint);
var
hreg: tregister;
begin
if l<>1 then
begin
hreg:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_op_const_reg_reg(current_asmdata.CurrAsmList,OP_IMUL,OS_ADDR,l,maybe_const_reg,hreg);
maybe_const_reg:=hreg;
end;
if location.reference.base=NR_NO then
location.reference.base:=maybe_const_reg
else if location.reference.index=NR_NO then
location.reference.index:=maybe_const_reg
else
begin
hreg:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList,location.reference,hreg);
reference_reset_base(location.reference,hreg,0);
{ insert new index register }
location.reference.index:=maybe_const_reg;
end;
end;
{ see remarks for tcgvecnode.update_reference_reg_mul above }
procedure tcgvecnode.update_reference_reg_packed(maybe_const_reg:tregister;l:aint);
var
sref: tsubsetreference;
offsetreg, hreg: tregister;
alignpower: aint;
temp : longint;
begin
{ only orddefs are bitpacked. Even then we only need special code in }
{ case the bitpacked *byte size* is not a power of two, otherwise }
{ everything can be handled using the the regular array code. }
if ((l mod 8) = 0) and
(ispowerof2(l div 8,temp) or
not is_ordinal(resultdef)) then
begin
update_reference_reg_mul(maybe_const_reg,l div 8);
exit;
end;
if (l > 8*sizeof(aint)) then
internalerror(200608051);
sref.ref := location.reference;
hreg := cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_op_const_reg_reg(current_asmdata.CurrAsmList,OP_SUB,OS_INT,tarraydef(left.resultdef).lowrange,maybe_const_reg,hreg);
cg.a_op_const_reg(current_asmdata.CurrAsmList,OP_IMUL,OS_INT,l,hreg);
{ keep alignment for index }
sref.ref.alignment := left.resultdef.alignment;
if not ispowerof2(sref.ref.alignment,temp) then
internalerror(2006081201);
alignpower:=temp;
offsetreg := cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_op_const_reg_reg(current_asmdata.CurrAsmList,OP_SHR,OS_ADDR,3+alignpower,hreg,offsetreg);
cg.a_op_const_reg(current_asmdata.CurrAsmList,OP_SHL,OS_ADDR,alignpower,offsetreg);
if (sref.ref.base = NR_NO) then
sref.ref.base := offsetreg
else if (sref.ref.index = NR_NO) then
sref.ref.index := offsetreg
else
begin
cg.a_op_reg_reg(current_asmdata.CurrAsmList,OP_ADD,OS_ADDR,sref.ref.base,offsetreg);
sref.ref.base := offsetreg;
end;
cg.a_op_const_reg(current_asmdata.CurrAsmList,OP_AND,OS_INT,(1 shl (3+alignpower))-1,hreg);
sref.bitindexreg := hreg;
sref.startbit := 0;
sref.bitlen := resultdef.packedbitsize;
if (left.location.loc = LOC_REFERENCE) then
location.loc := LOC_SUBSETREF
else
location.loc := LOC_CSUBSETREF;
location.sref := sref;
end;
procedure tcgvecnode.second_wideansistring;
begin
end;
procedure tcgvecnode.second_dynamicarray;
begin
end;
procedure tcgvecnode.rangecheck_array;
var
hightree : tnode;
poslabel,
neglabel : tasmlabel;
hreg : tregister;
paraloc1,paraloc2 : tcgpara;
begin
paraloc1.init;
paraloc2.init;
if is_open_array(left.resultdef) or
is_array_of_const(left.resultdef) then
begin
{ 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(left).symtableentry).owner).defowner).proccalloption in [pocall_cdecl,pocall_cppdecl]) then
begin
{ Get high value }
hightree:=load_high_value_node(tparavarsym(tloadnode(left).symtableentry));
{ it must be available }
if not assigned(hightree) then
internalerror(200212201);
firstpass(hightree);
secondpass(hightree);
{ generate compares }
if (right.location.loc in [LOC_REGISTER,LOC_CREGISTER]) then
hreg:=cg.makeregsize(current_asmdata.CurrAsmList,right.location.register,OS_INT)
else
begin
hreg:=cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
cg.a_load_loc_reg(current_asmdata.CurrAsmList,OS_INT,right.location,hreg);
end;
current_asmdata.getjumplabel(neglabel);
current_asmdata.getjumplabel(poslabel);
cg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,OS_INT,OC_LT,0,hreg,poslabel);
cg.a_cmp_loc_reg_label(current_asmdata.CurrAsmList,OS_INT,OC_BE,hightree.location,hreg,neglabel);
cg.a_label(current_asmdata.CurrAsmList,poslabel);
cg.a_call_name(current_asmdata.CurrAsmList,'FPC_RANGEERROR',false);
cg.a_label(current_asmdata.CurrAsmList,neglabel);
{ release hightree }
hightree.free;
end;
end
else
if is_dynamic_array(left.resultdef) then
begin
paramanager.getintparaloc(pocall_default,1,paraloc1);
paramanager.getintparaloc(pocall_default,2,paraloc2);
paramanager.allocparaloc(current_asmdata.CurrAsmList,paraloc2);
cg.a_param_loc(current_asmdata.CurrAsmList,right.location,paraloc2);
paramanager.allocparaloc(current_asmdata.CurrAsmList,paraloc1);
cg.a_param_loc(current_asmdata.CurrAsmList,left.location,paraloc1);
paramanager.freeparaloc(current_asmdata.CurrAsmList,paraloc1);
paramanager.freeparaloc(current_asmdata.CurrAsmList,paraloc2);
cg.allocallcpuregisters(current_asmdata.CurrAsmList);
cg.a_call_name(current_asmdata.CurrAsmList,'FPC_DYNARRAY_RANGECHECK',false);
cg.deallocallcpuregisters(current_asmdata.CurrAsmList);
end
else
cg.g_rangecheck(current_asmdata.CurrAsmList,right.location,right.resultdef,left.resultdef);
paraloc1.done;
paraloc2.done;
end;
procedure tcgvecnode.pass_generate_code;
var
offsetdec,
extraoffset : aint;
t : tnode;
href : treference;
otl,ofl : tasmlabel;
newsize : tcgsize;
mulsize,
bytemulsize,
alignpow : aint;
isjump : boolean;
paraloc1,
paraloc2 : tcgpara;
subsetref : tsubsetreference;
temp : longint;
begin
paraloc1.init;
paraloc2.init;
mulsize:=get_mul_size;
if not is_packed_array(left.resultdef) then
bytemulsize:=mulsize
else
bytemulsize:=mulsize div 8;
newsize:=def_cgsize(resultdef);
secondpass(left);
if left.location.loc=LOC_CREFERENCE then
location_reset(location,LOC_CREFERENCE,newsize)
else
location_reset(location,LOC_REFERENCE,newsize);
{ an ansistring needs to be dereferenced }
if is_ansistring(left.resultdef) or
is_widestring(left.resultdef) or
is_unicodestring(left.resultdef) then
begin
if nf_callunique in flags then
internalerror(200304236);
{DM!!!!!}
case left.location.loc of
LOC_REGISTER,
LOC_CREGISTER :
begin
{$ifdef m68k}
location.reference.base:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_load_reg_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,left.location.register,location.reference.base);
{$else m68k}
location.reference.base:=left.location.register;
{$endif m68k}
end;
LOC_CREFERENCE,
LOC_REFERENCE :
begin
location.reference.base:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,left.location.reference,location.reference.base);
end;
else
internalerror(2002032218);
end;
{ check for a zero length string,
we can use the ansistring routine here }
if (cs_check_range in current_settings.localswitches) then
begin
paramanager.getintparaloc(pocall_default,1,paraloc1);
paramanager.allocparaloc(current_asmdata.CurrAsmList,paraloc1);
cg.a_param_reg(current_asmdata.CurrAsmList,OS_ADDR,location.reference.base,paraloc1);
paramanager.freeparaloc(current_asmdata.CurrAsmList,paraloc1);
cg.allocallcpuregisters(current_asmdata.CurrAsmList);
cg.a_call_name(current_asmdata.CurrAsmList,'FPC_'+upper(tstringdef(left.resultdef).stringtypname)+'_CHECKZERO',false);
cg.deallocallcpuregisters(current_asmdata.CurrAsmList);
end;
{ in ansistrings/widestrings S[1] is p<w>char(S)[0] !! }
if is_ansistring(left.resultdef) then
offsetdec:=1
else
offsetdec:=2;
dec(location.reference.offset,offsetdec);
end
else if is_dynamic_array(left.resultdef) then
begin
case left.location.loc of
LOC_REGISTER,
LOC_CREGISTER :
location.reference.base:=left.location.register;
LOC_REFERENCE,
LOC_CREFERENCE :
begin
location.reference.base:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,
left.location.reference,location.reference.base);
end;
else
internalerror(2002032219);
end;
end
else
location_copy(location,left.location);
{ location must be memory }
if not(location.loc in [LOC_REFERENCE,LOC_CREFERENCE]) then
internalerror(200411013);
{ offset can only differ from 0 if arraydef }
if (left.resultdef.typ=arraydef) and
not(is_dynamic_array(left.resultdef)) and
(not(is_packed_array(left.resultdef)) or
((mulsize mod 8 = 0) and
ispowerof2(mulsize div 8,temp)) or
{ only orddefs are bitpacked }
not is_ordinal(resultdef)) then
dec(location.reference.offset,bytemulsize*tarraydef(left.resultdef).lowrange);
if right.nodetype=ordconstn then
begin
{ offset can only differ from 0 if arraydef }
case left.resultdef.typ of
arraydef :
begin
{ do not do any range checking when this is an array access to a pointer which has been
typecasted from an array }
if (not (ado_isconvertedpointer in tarraydef(left.resultdef).arrayoptions)) then
begin
if not(is_open_array(left.resultdef)) and
not(is_array_of_const(left.resultdef)) and
not(is_dynamic_array(left.resultdef)) then
begin
if (tordconstnode(right).value.svalue>tarraydef(left.resultdef).highrange) or
(tordconstnode(right).value.svalue<tarraydef(left.resultdef).lowrange) then
begin
{ this should be caught in the typecheckpass! (JM) }
if (cs_check_range in current_settings.localswitches) then
CGMessage(parser_e_range_check_error)
else
CGMessage(parser_w_range_check_error);
end;
end
else
begin
{ range checking for open and dynamic arrays needs
runtime code }
secondpass(right);
if (cs_check_range in current_settings.localswitches) then
rangecheck_array;
end;
end;
end;
stringdef :
begin
if (cs_check_range in current_settings.localswitches) then
begin
case tstringdef(left.resultdef).stringtype of
{ it's the same for ansi- and wide strings }
st_unicodestring,
st_widestring,
st_ansistring:
begin
paramanager.getintparaloc(pocall_default,1,paraloc1);
paramanager.getintparaloc(pocall_default,2,paraloc2);
paramanager.allocparaloc(current_asmdata.CurrAsmList,paraloc2);
cg.a_param_const(current_asmdata.CurrAsmList,OS_INT,tordconstnode(right).value.svalue,paraloc2);
href:=location.reference;
paramanager.allocparaloc(current_asmdata.CurrAsmList,paraloc1);
if not(tf_winlikewidestring in target_info.flags) or
(tstringdef(left.resultdef).stringtype<>st_widestring) then
begin
dec(href.offset,sizeof(pint)-offsetdec);
cg.a_param_ref(current_asmdata.CurrAsmList,OS_ADDR,href,paraloc1);
end
else
begin
{ winlike widestrings have a 4 byte length }
dec(href.offset,4-offsetdec);
cg.a_param_ref(current_asmdata.CurrAsmList,OS_32,href,paraloc1);
end;
paramanager.freeparaloc(current_asmdata.CurrAsmList,paraloc1);
paramanager.freeparaloc(current_asmdata.CurrAsmList,paraloc2);
cg.allocallcpuregisters(current_asmdata.CurrAsmList);
cg.a_call_name(current_asmdata.CurrAsmList,'FPC_'+upper(tstringdef(left.resultdef).stringtypname)+'_RANGECHECK',false);
cg.deallocallcpuregisters(current_asmdata.CurrAsmList);
end;
st_shortstring:
begin
{!!!!!!!!!!!!!!!!!}
{ if this one is implemented making use of the high parameter for openshortstrings, update ncgutils.do_get_used_regvars() too (JM) }
end;
st_longstring:
begin
{!!!!!!!!!!!!!!!!!}
end;
end;
end;
end;
end;
if not(is_packed_array(left.resultdef)) or
((mulsize mod 8 = 0) and
(ispowerof2(mulsize div 8,temp) or
{ only orddefs are bitpacked }
not is_ordinal(resultdef))) then
begin
inc(location.reference.offset,
bytemulsize*tordconstnode(right).value.svalue);
{ don't do this for floats etc.; needed to properly set the }
{ size for bitpacked arrays (e.g. a bitpacked array of }
{ enums who are size 2 but fit in one byte -> in the array }
{ they will be one byte and have to be stored like that) }
if is_packed_array(left.resultdef) and
(tcgsize2size[newsize] <> bytemulsize) then
newsize:=int_cgsize(bytemulsize);
end
else
begin
subsetref.ref := location.reference;
subsetref.ref.alignment := left.resultdef.alignment;
if not ispowerof2(subsetref.ref.alignment,temp) then
internalerror(2006081212);
alignpow:=temp;
inc(subsetref.ref.offset,((mulsize * (tordconstnode(right).value.svalue-tarraydef(left.resultdef).lowrange)) shr (3+alignpow)) shl alignpow);
subsetref.bitindexreg := NR_NO;
subsetref.startbit := (mulsize * (tordconstnode(right).value.svalue-tarraydef(left.resultdef).lowrange)) and ((1 shl (3+alignpow))-1);
subsetref.bitlen := resultdef.packedbitsize;
if (left.location.loc = LOC_REFERENCE) then
location.loc := LOC_SUBSETREF
else
location.loc := LOC_CSUBSETREF;
location.sref := subsetref;
end;
end
else
{ not nodetype=ordconstn }
begin
if (cs_opt_level1 in current_settings.optimizerswitches) and
{ if we do range checking, we don't }
{ need that fancy code (it would be }
{ buggy) }
not(cs_check_range in current_settings.localswitches) and
(left.resultdef.typ=arraydef) and
not is_packed_array(left.resultdef) then
begin
extraoffset:=0;
if (right.nodetype=addn) then
begin
if taddnode(right).right.nodetype=ordconstn then
begin
extraoffset:=tordconstnode(taddnode(right).right).value.svalue;
t:=taddnode(right).left;
taddnode(right).left:=nil;
right.free;
right:=t;
end
else if taddnode(right).left.nodetype=ordconstn then
begin
extraoffset:=tordconstnode(taddnode(right).left).value.svalue;
t:=taddnode(right).right;
taddnode(right).right:=nil;
right.free;
right:=t;
end;
end
else if (right.nodetype=subn) then
begin
if taddnode(right).right.nodetype=ordconstn then
begin
extraoffset:=-tordconstnode(taddnode(right).right).value.svalue;
t:=taddnode(right).left;
taddnode(right).left:=nil;
right.free;
right:=t;
end;
end;
inc(location.reference.offset,
mulsize*extraoffset);
end;
{ calculate from left to right }
if not(location.loc in [LOC_CREFERENCE,LOC_REFERENCE]) then
internalerror(200304237);
isjump:=(right.expectloc=LOC_JUMP);
if isjump then
begin
otl:=current_procinfo.CurrTrueLabel;
current_asmdata.getjumplabel(current_procinfo.CurrTrueLabel);
ofl:=current_procinfo.CurrFalseLabel;
current_asmdata.getjumplabel(current_procinfo.CurrFalseLabel);
end;
secondpass(right);
{ if mulsize = 1, we won't have to modify the index }
location_force_reg(current_asmdata.CurrAsmList,right.location,OS_ADDR,true);
if isjump then
begin
current_procinfo.CurrTrueLabel:=otl;
current_procinfo.CurrFalseLabel:=ofl;
end
else if (right.location.loc = LOC_JUMP) then
internalerror(2006010801);
{ only range check now, we can't range check loc_flags/loc_jump }
if cs_check_range in current_settings.localswitches then
begin
if left.resultdef.typ=arraydef then
rangecheck_array;
end;
{ produce possible range check code: }
if cs_check_range in current_settings.localswitches then
begin
if left.resultdef.typ=arraydef then
begin
{ done defore (PM) }
end
else if (left.resultdef.typ=stringdef) then
begin
case tstringdef(left.resultdef).stringtype of
{ it's the same for ansi- and wide strings }
st_unicodestring,
st_widestring,
st_ansistring:
begin
paramanager.getintparaloc(pocall_default,1,paraloc1);
paramanager.getintparaloc(pocall_default,2,paraloc2);
paramanager.allocparaloc(current_asmdata.CurrAsmList,paraloc2);
cg.a_param_reg(current_asmdata.CurrAsmList,OS_INT,right.location.register,paraloc2);
href:=location.reference;
dec(href.offset,sizeof(pint)-offsetdec);
href:=location.reference;
paramanager.allocparaloc(current_asmdata.CurrAsmList,paraloc1);
if not(tf_winlikewidestring in target_info.flags) or
(tstringdef(left.resultdef).stringtype<>st_widestring) then
begin
dec(href.offset,sizeof(pint)-offsetdec);
cg.a_param_ref(current_asmdata.CurrAsmList,OS_ADDR,href,paraloc1);
end
else
begin
{ winlike widestrings have a 4 byte length }
dec(href.offset,4-offsetdec);
cg.a_param_ref(current_asmdata.CurrAsmList,OS_32,href,paraloc1);
end;
paramanager.freeparaloc(current_asmdata.CurrAsmList,paraloc1);
paramanager.freeparaloc(current_asmdata.CurrAsmList,paraloc2);
cg.allocallcpuregisters(current_asmdata.CurrAsmList);
cg.a_call_name(current_asmdata.CurrAsmList,'FPC_'+upper(tstringdef(left.resultdef).stringtypname)+'_RANGECHECK',false);
cg.deallocallcpuregisters(current_asmdata.CurrAsmList);
end;
st_shortstring:
begin
{!!!!!!!!!!!!!!!!!}
end;
st_longstring:
begin
{!!!!!!!!!!!!!!!!!}
end;
end;
end;
end;
{ insert the register and the multiplication factor in the
reference }
if not is_packed_array(left.resultdef) then
update_reference_reg_mul(right.location.register,mulsize)
else
update_reference_reg_packed(right.location.register,mulsize);
end;
location.size:=newsize;
paraloc1.done;
paraloc2.done;
end;
begin
cloadvmtaddrnode:=tcgloadvmtaddrnode;
cloadparentfpnode:=tcgloadparentfpnode;
caddrnode:=tcgaddrnode;
cderefnode:=tcgderefnode;
csubscriptnode:=tcgsubscriptnode;
cwithnode:=tcgwithnode;
cvecnode:=tcgvecnode;
end.
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