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fpc/compiler/ncgmem.pas
Jonas Maebe 996e325175 * converted range checking for open arrays/array of const from the code 
generator to the typecheck pass, so that it also works for platforms
    that use the parentfpstruct way to handle accesses to nested frames
    in case the array has been migrated to such a parentfpstruct
   o additionally, the number of comparisons for such range checks
     has been reduced from 3 (for signed indices) or 2 (for unsigned
     indices) to 1 in all cases
   o the range checking code is disabled for the JVM target, as the
     JVM automatically range checks all array accesses itself anyway

git-svn-id: trunk@34034 -
2016-06-30 15:33:47 +00:00

1100 lines
48 KiB
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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,cgutils,cpuinfo,cpubase,
symtype,
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)
protected
function handle_platform_subscript: boolean; virtual;
public
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;
procedure rangecheck_string;
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;regsize: tdef; l: aint);virtual;
procedure update_reference_reg_packed(maybe_const_reg: tregister; regsize: tdef; l: aint);virtual;
procedure update_reference_offset(var ref: treference; index, mulsize: aint); virtual;
procedure second_wideansistring;virtual;
procedure second_dynamicarray;virtual;
function valid_index_size(size: tcgsize): boolean;virtual;
public
procedure pass_generate_code;override;
end;
implementation
uses
systems,
cutils,cclasses,verbose,globals,constexp,fmodule,
symconst,symbase,symdef,symsym,symcpu,symtable,defutil,paramgr,
aasmbase,aasmtai,aasmdata,
procinfo,pass_2,parabase,
pass_1,nld,ncon,nadd,ncnv,nutils,
cgobj,hlcgobj,
tgobj,ncgutil,objcgutl,
defcmp
;
{*****************************************************************************
TCGLOADVMTADDRNODE
*****************************************************************************}
procedure tcgloadvmtaddrnode.pass_generate_code;
var
href : treference;
pool : THashSet;
entry : PHashSetItem;
indirect : boolean;
begin
location_reset(location,LOC_REGISTER,def_cgsize(voidpointertype));
if (left.nodetype=typen) then
begin
location.register:=hlcg.getaddressregister(current_asmdata.CurrAsmList,voidpointertype);
if not is_objcclass(left.resultdef) then
begin
{ we are using a direct reference if any of the following is true:
- the target does not support packages
- the target does not use indirect references
- the class is located inside the same unit }
indirect:=(tf_supports_packages in target_info.flags) and
(target_info.system in systems_indirect_var_imports) and
not sym_is_owned_by(left.resultdef.typesym,current_module.globalsymtable) and
(
(current_module.globalsymtable=current_module.localsymtable) or
not sym_is_owned_by(left.resultdef.typesym,current_module.localsymtable)
);
reference_reset_symbol(href,
current_asmdata.RefAsmSymbol(tobjectdef(tclassrefdef(resultdef).pointeddef).vmt_mangledname,AT_DATA,indirect),0,
voidpointertype.size);
hlcg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList,resultdef,resultdef,href,location.register);
end
else
begin
pool:=current_asmdata.ConstPools[sp_objcclassnamerefs];
entry:=pool.FindOrAdd(@tobjectdef(left.resultdef).objextname^[1],length(tobjectdef(left.resultdef).objextname^));
if (target_info.system in systems_objc_nfabi) then
begin
{ find/add necessary classref/classname pool entries }
objcfinishclassrefnfpoolentry(entry,tobjectdef(left.resultdef));
end
else
begin
{ find/add necessary classref/classname pool entries }
objcfinishstringrefpoolentry(entry,sp_objcclassnames,sec_objc_cls_refs,sec_objc_class_names);
end;
reference_reset_symbol(href,tasmlabel(entry^.Data),0,voidpointertype.size);
hlcg.a_load_ref_reg(current_asmdata.CurrAsmList,objc_idtype,objc_idtype,href,location.register);
end;
end
else
{ should be handled in pass 1 }
internalerror(2015052801);
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,def_cgsize(parentfpvoidpointertype));
location.register:=current_procinfo.framepointer;
end
else
begin
currpi:=current_procinfo;
location_reset(location,LOC_REGISTER,def_cgsize(parentfpvoidpointertype));
location.register:=hlcg.getaddressregister(current_asmdata.CurrAsmList,parentfpvoidpointertype);
{ load framepointer of current proc }
hsym:=tparavarsym(currpi.procdef.parast.Find('parentfp'));
if not assigned(hsym) then
internalerror(200309281);
hlcg.a_load_loc_reg(current_asmdata.CurrAsmList,parentfpvoidpointertype,parentfpvoidpointertype,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);
hlcg.reference_reset_base(href,parentfpvoidpointertype,location.register,hsym.localloc.reference.offset,sizeof(pint));
hlcg.a_load_ref_reg(current_asmdata.CurrAsmList,parentfpvoidpointertype,parentfpvoidpointertype,href,location.register);
end;
end;
end;
{*****************************************************************************
TCGADDRNODE
*****************************************************************************}
procedure tcgaddrnode.pass_generate_code;
begin
secondpass(left);
location_reset(location,LOC_REGISTER,int_cgsize(resultdef.size));
location.register:=hlcg.getaddressregister(current_asmdata.CurrAsmList,resultdef);
if not(left.location.loc in [LOC_REFERENCE,LOC_CREFERENCE]) then
{ on x86_64-win64, array of chars can be returned in registers, however,
when passing these arrays to other functions, the compiler wants to take
the address of the array so when the addrnode has been created internally,
we have to force the data into memory, see also tw14388.pp
}
if nf_internal in flags then
hlcg.location_force_mem(current_asmdata.CurrAsmList,left.location,left.resultdef)
else
internalerror(2006111510);
hlcg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList,left.resultdef,resultdef,left.location.reference,location.register);
end;
{*****************************************************************************
TCGDEREFNODE
*****************************************************************************}
procedure tcgderefnode.pass_generate_code;
var
paraloc1 : tcgpara;
pd : tprocdef;
sym : tsym;
st : tsymtable;
hp : pnode;
extraoffset : tcgint;
begin
sym:=nil;
{ assume natural alignment, except for packed records }
if not(resultdef.typ in [recorddef,objectdef]) or
(tabstractrecordsymtable(tabstractrecorddef(resultdef).symtable).usefieldalignment<>1) then
location_reset_ref(location,LOC_REFERENCE,def_cgsize(resultdef),resultdef.alignment)
else
location_reset_ref(location,LOC_REFERENCE,def_cgsize(resultdef),1);
{ can we fold an add/sub node into the offset of the deref node? }
extraoffset:=0;
hp:=actualtargetnode(@left);
if (hp^.nodetype=subn) and is_constintnode(taddnode(hp^).right) then
begin
extraoffset:=-tcgint(tordconstnode(taddnode(hp^).right).value);
replacenode(hp^,taddnode(hp^).left);
end
else if (hp^.nodetype=addn) and is_constintnode(taddnode(hp^).right) then
begin
extraoffset:=tcgint(tordconstnode(taddnode(hp^).right).value);
replacenode(hp^,taddnode(hp^).left);
end
else if (hp^.nodetype=addn) and is_constintnode(taddnode(hp^).left) then
begin
extraoffset:=tcgint(tordconstnode(taddnode(hp^).left).value);
replacenode(hp^,taddnode(hp^).right);
end;
secondpass(left);
if not(left.location.loc in [LOC_CREGISTER,LOC_REGISTER,LOC_CREFERENCE,LOC_REFERENCE,LOC_CONSTANT]) then
hlcg.location_force_reg(current_asmdata.CurrAsmList,left.location,left.resultdef,left.resultdef,true);
case left.location.loc of
LOC_CREGISTER,
LOC_REGISTER:
begin
hlcg.maybe_change_load_node_reg(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);
hlcg.a_load_loc_reg(current_asmdata.CurrAsmList,left.resultdef,left.resultdef,left.location,location.reference.base);
end;
LOC_CONSTANT:
begin
location.reference.offset:=left.location.value;
end;
else
internalerror(200507031);
end;
location.reference.offset:=location.reference.offset+extraoffset;
if (cs_use_heaptrc in current_settings.globalswitches) and
(cs_checkpointer in current_settings.localswitches) and
not(cs_compilesystem in current_settings.moduleswitches) and
tpointerdef(left.resultdef).compatible_with_pointerdef_size(tpointerdef(voidpointertype)) and
not(nf_no_checkpointer in flags) and
{ can be NR_NO in case of LOC_CONSTANT }
(location.reference.base<>NR_NO) then
begin
if not searchsym_in_named_module('HEAPTRC','CHECKPOINTER',sym,st) or
(sym.typ<>procsym) then
internalerror(2012010601);
pd:=tprocdef(tprocsym(sym).ProcdefList[0]);
paraloc1.init;
paramanager.getintparaloc(current_asmdata.CurrAsmList,pd,1,paraloc1);
hlcg.a_load_reg_cgpara(current_asmdata.CurrAsmList,left.resultdef,location.reference.base,paraloc1);
paramanager.freecgpara(current_asmdata.CurrAsmList,paraloc1);
paraloc1.done;
hlcg.allocallcpuregisters(current_asmdata.CurrAsmList);
hlcg.a_call_name(current_asmdata.CurrAsmList,pd,'FPC_CHECKPOINTER',[@paraloc1],nil,false);
hlcg.deallocallcpuregisters(current_asmdata.CurrAsmList);
end;
end;
{*****************************************************************************
TCGSUBSCRIPTNODE
*****************************************************************************}
function tcgsubscriptnode.handle_platform_subscript: boolean;
begin
result:=false;
end;
procedure tcgsubscriptnode.pass_generate_code;
var
asmsym: tasmsymbol;
paraloc1 : tcgpara;
tmpref: treference;
sref: tsubsetreference;
awordoffset,
offsetcorrection : aint;
pd : tprocdef;
sym : tsym;
st : tsymtable;
begin
sym:=nil;
secondpass(left);
if codegenerror then
exit;
paraloc1.init;
{ several object types must be dereferenced implicitly }
if is_implicit_pointer_object_type(left.resultdef) then
begin
if (not is_managed_type(left.resultdef)) or
(target_info.system in systems_garbage_collected_managed_types) then
begin
{ the contents of a class are aligned to a sizeof(pointer) }
location_reset_ref(location,LOC_REFERENCE,def_cgsize(resultdef),voidpointertype.size);
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:=cg.getaddressregister(current_asmdata.CurrAsmList);
hlcg.a_load_reg_reg(current_asmdata.CurrAsmList,left.resultdef,left.resultdef,
left.location.register,location.reference.base);
end
else
{$endif}
hlcg.reference_reset_base(location.reference,left.resultdef,left.location.register,0,location.reference.alignment);
end;
LOC_CREFERENCE,
LOC_REFERENCE,
{ tricky type casting of parameters can cause these locations, see tb0592.pp on x86_64-linux }
LOC_SUBSETREG,
LOC_CSUBSETREG,
LOC_SUBSETREF,
LOC_CSUBSETREF:
begin
hlcg.reference_reset_base(location.reference,left.resultdef,
hlcg.getaddressregister(current_asmdata.CurrAsmList,left.resultdef),0,location.reference.alignment);
hlcg.a_load_loc_reg(current_asmdata.CurrAsmList,left.resultdef,left.resultdef,left.location,location.reference.base);
end;
LOC_CONSTANT:
begin
{ can happen with @classtype(pointerconst).field }
location.reference.offset:=left.location.value;
end;
else
internalerror(2009092401);
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
if not searchsym_in_named_module('HEAPTRC','CHECKPOINTER',sym,st) or
(sym.typ<>procsym) then
internalerror(2012010602);
pd:=tprocdef(tprocsym(sym).ProcdefList[0]);
paramanager.getintparaloc(current_asmdata.CurrAsmList,pd,1,paraloc1);
hlcg.a_load_reg_cgpara(current_asmdata.CurrAsmList,left.resultdef,location.reference.base,paraloc1);
paramanager.freecgpara(current_asmdata.CurrAsmList,paraloc1);
hlcg.allocallcpuregisters(current_asmdata.CurrAsmList);
hlcg.a_call_name(current_asmdata.CurrAsmList,pd,'FPC_CHECKPOINTER',[@paraloc1],nil,false);
hlcg.deallocallcpuregisters(current_asmdata.CurrAsmList);
end;
end
else
{ reference-counted implicit pointer object types don't have
fields -> cannot be subscripted (calls are handled via call
nodes) }
internalerror(2011011901);
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_CONSTANT,
LOC_REGISTER,
LOC_CREGISTER,
{ if a floating point value is casted into a record, it
can happen that we get here an fpu or mm register }
LOC_MMREGISTER,
LOC_FPUREGISTER,
LOC_CMMREGISTER,
LOC_CFPUREGISTER:
begin
{ in case the result is not something that can be put
into an integer register (e.g.
function_returning_record().non_regable_field, or
a function returning a value > sizeof(intreg))
-> force to memory
}
if not tstoreddef(left.resultdef).is_intregable or
not tstoreddef(resultdef).is_intregable or
{ if the field spans multiple registers, we must force the record into
memory as well }
((left.location.size in [OS_PAIR,OS_SPAIR]) and
(vs.fieldoffset div sizeof(aword)<>(vs.fieldoffset+vs.getsize-1) div sizeof(aword))) or
(location.loc in [LOC_MMREGISTER,LOC_FPUREGISTER,LOC_CMMREGISTER,LOC_CFPUREGISTER,
{ actually, we should be able to "subscript" a constant, but this would require some code
which enables dumping and reading constants from a temporary memory buffer. This
must be done a CPU dependent way, so it is not easy and probably not worth the effort (FK)
}
LOC_CONSTANT]) then
hlcg.location_force_mem(current_asmdata.CurrAsmList,location,left.resultdef)
else
begin
if (left.location.loc = LOC_REGISTER) then
location.loc := LOC_SUBSETREG
else
location.loc := LOC_CSUBSETREG;
location.size:=def_cgsize(resultdef);
offsetcorrection:=0;
if (left.location.size in [OS_PAIR,OS_SPAIR]) then
begin
if not is_packed_record_or_object(left.resultdef) then
awordoffset:=sizeof(aword)
else
awordoffset:=sizeof(aword)*8;
if (vs.fieldoffset>=awordoffset) xor (target_info.endian=endian_big) then
location.sreg.subsetreg := left.location.registerhi
else
location.sreg.subsetreg := left.location.register;
if vs.fieldoffset>=awordoffset then
offsetcorrection := sizeof(aword)*8;
location.sreg.subsetregsize := OS_INT;
end
else
begin
location.sreg.subsetreg := left.location.register;
location.sreg.subsetregsize := left.location.size;
end;
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+offsetcorrection
else
location.sreg.startbit := (vs.fieldoffset * 8)-offsetcorrection;
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+offsetcorrection
else
location.sreg.startbit := vs.fieldoffset-offsetcorrection;
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 is_objc_class_or_protocol(left.resultdef) and
(target_info.system in systems_objc_nfabi) then
begin
if (location.loc<>LOC_REFERENCE) or
(location.reference.index<>NR_NO) then
internalerror(2009092402);
{ the actual field offset is stored in memory (to solve the
"fragile base class" problem: this way the layout of base
classes can be changed without breaking programs compiled against
earlier versions)
}
asmsym:=current_asmdata.RefAsmSymbol(vs.mangledname);
reference_reset_symbol(tmpref,asmsym,0,sizeof(pint));
hlcg.g_ptrtypecast_ref(current_asmdata.CurrAsmList,left.resultdef,cpointerdef.getreusable(resultdef),location.reference);
location.reference.index:=hlcg.getintregister(current_asmdata.CurrAsmList,ptruinttype);
hlcg.a_load_ref_reg(current_asmdata.CurrAsmList,ptruinttype,ptruinttype,tmpref,location.reference.index);
{ always packrecords C -> natural alignment }
location.reference.alignment:=vs.vardef.alignment;
end
else if handle_platform_subscript then
begin
{ done }
end
else 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);
location.reference.alignment:=newalignment(location.reference.alignment,vs.fieldoffset);
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);
location.reference.alignment:=newalignment(location.reference.alignment,vs.fieldoffset div 8);
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; regsize: tdef; 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,location.reference.alignment);
{ insert new index register }
location.reference.index:=maybe_const_reg;
end;
{ update alignment }
if (location.reference.alignment=0) then
internalerror(2009020704);
location.reference.alignment:=newalignment(location.reference.alignment,l);
end;
{ see remarks for tcgvecnode.update_reference_reg_mul above }
procedure tcgvecnode.update_reference_reg_packed(maybe_const_reg: tregister; regsize: tdef; 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)
{$ifndef cpu64bitalu}
or is_64bitint(resultdef)
{$endif not cpu64bitalu}
) then
begin
update_reference_reg_mul(maybe_const_reg,regsize,l div 8);
exit;
end;
if (l > 8*sizeof(aint)) then
internalerror(200608051);
sref.ref := location.reference;
hreg := cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_op_const_reg_reg(current_asmdata.CurrAsmList,OP_SUB,OS_ADDR,tarraydef(left.resultdef).lowrange,maybe_const_reg,hreg);
cg.a_op_const_reg(current_asmdata.CurrAsmList,OP_IMUL,OS_ADDR,l,hreg);
{ keep alignment for index }
sref.ref.alignment := left.resultdef.alignment;
if not ispowerof2(packedbitsloadsize(l),temp) then
internalerror(2006081201);
alignpower:=temp;
offsetreg := cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_op_const_reg_reg(current_asmdata.CurrAsmList,OP_SHR,OS_ADDR,3+alignpower,hreg,offsetreg);
cg.a_op_const_reg(current_asmdata.CurrAsmList,OP_SHL,OS_ADDR,alignpower,offsetreg);
if (sref.ref.base = NR_NO) then
sref.ref.base := offsetreg
else if (sref.ref.index = NR_NO) then
sref.ref.index := offsetreg
else
begin
cg.a_op_reg_reg(current_asmdata.CurrAsmList,OP_ADD,OS_ADDR,sref.ref.base,offsetreg);
sref.ref.base := offsetreg;
end;
{ the if expression below is a constant evaluated at compile time, so disable the unreachable code
warning }
{$push}
{$warn 6018 off}
{ we can reuse hreg only if OS_INT and OS_ADDR have the same size/type }
if OS_INT<>OS_ADDR then
begin
sref.bitindexreg := cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
cg.a_load_reg_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_INT,hreg,sref.bitindexreg);
end
else
sref.bitindexreg:=hreg;
{$pop}
cg.a_op_const_reg(current_asmdata.CurrAsmList,OP_AND,OS_INT,(1 shl (3+alignpower))-1,sref.bitindexreg);
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.update_reference_offset(var ref: treference; index, mulsize: aint);
begin
inc(ref.offset,index*mulsize);
end;
procedure tcgvecnode.second_wideansistring;
begin
end;
procedure tcgvecnode.second_dynamicarray;
begin
end;
function tcgvecnode.valid_index_size(size: tcgsize): boolean;
begin
result:=
tcgsize2signed[size]=tcgsize2signed[OS_ADDR];
end;
procedure tcgvecnode.rangecheck_array;
var
hightree : tnode;
poslabel,
neglabel : tasmlabel;
hreg : tregister;
paraloc1,paraloc2 : tcgpara;
pd : tprocdef;
begin
{ omit range checking when this is an array access to a pointer which has been
typecasted from an array }
if (ado_isconvertedpointer in tarraydef(left.resultdef).arrayoptions) then
exit;
paraloc1.init;
paraloc2.init;
if is_dynamic_array(left.resultdef) then
begin
pd:=search_system_proc('fpc_dynarray_rangecheck');
paramanager.getintparaloc(current_asmdata.CurrAsmList,pd,1,paraloc1);
paramanager.getintparaloc(current_asmdata.CurrAsmList,pd,2,paraloc2);
if pd.is_pushleftright then
begin
cg.a_load_loc_cgpara(current_asmdata.CurrAsmList,left.location,paraloc1);
cg.a_load_loc_cgpara(current_asmdata.CurrAsmList,right.location,paraloc2);
end
else
begin
cg.a_load_loc_cgpara(current_asmdata.CurrAsmList,right.location,paraloc2);
cg.a_load_loc_cgpara(current_asmdata.CurrAsmList,left.location,paraloc1);
end;
paramanager.freecgpara(current_asmdata.CurrAsmList,paraloc1);
paramanager.freecgpara(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;
{ for regular arrays, we don't have to do anything because the index has been
type converted to the index type, which already inserted a range check if
necessary }
paraloc1.done;
paraloc2.done;
end;
procedure tcgvecnode.rangecheck_string;
var
paraloc1,
paraloc2: tcgpara;
helpername: TIDString;
pd: tprocdef;
begin
paraloc1.init;
paraloc2.init;
case tstringdef(left.resultdef).stringtype of
{ it's the same for ansi- and wide strings }
st_unicodestring,
st_widestring,
st_ansistring:
begin
helpername:='fpc_'+tstringdef(left.resultdef).stringtypname+'_rangecheck';
pd:=search_system_proc(helpername);
paramanager.getintparaloc(current_asmdata.CurrAsmList,pd,1,paraloc1);
paramanager.getintparaloc(current_asmdata.CurrAsmList,pd,2,paraloc2);
if pd.is_pushleftright then
begin
hlcg.a_load_loc_cgpara(current_asmdata.CurrAsmList,left.resultdef,left.location,paraloc1);
hlcg.a_load_loc_cgpara(current_asmdata.CurrAsmList,right.resultdef,right.location,paraloc2);
end
else
begin
hlcg.a_load_loc_cgpara(current_asmdata.CurrAsmList,right.resultdef,right.location,paraloc2);
hlcg.a_load_loc_cgpara(current_asmdata.CurrAsmList,left.resultdef,left.location,paraloc1);
end;
paramanager.freecgpara(current_asmdata.CurrAsmList,paraloc1);
paramanager.freecgpara(current_asmdata.CurrAsmList,paraloc2);
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,pd,[@paraloc1,@paraloc2],nil).resetiftemp;
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;
paraloc1.done;
paraloc2.done;
end;
procedure tcgvecnode.pass_generate_code;
var
offsetdec,
extraoffset : aint;
rightp : pnode;
newsize : tcgsize;
mulsize,
bytemulsize,
alignpow : aint;
paraloc1,
paraloc2 : tcgpara;
subsetref : tsubsetreference;
temp : longint;
indexdef : tdef;
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_ref(location,LOC_CREFERENCE,newsize,left.location.reference.alignment)
else
location_reset_ref(location,LOC_REFERENCE,newsize,left.location.reference.alignment);
{ an ansistring needs to be dereferenced }
if is_ansistring(left.resultdef) or
is_wide_or_unicode_string(left.resultdef) then
begin
if nf_callunique in flags then
internalerror(200304236);
{DM!!!!!}
case left.location.loc of
LOC_REGISTER,
LOC_CREGISTER :
begin
hlcg.reference_reset_base(location.reference,left.resultdef,left.location.register,0,location.reference.alignment);
end;
LOC_CREFERENCE,
LOC_REFERENCE :
begin
hlcg.reference_reset_base(location.reference,left.resultdef,hlcg.getaddressregister(current_asmdata.CurrAsmList,left.resultdef),0,location.reference.alignment);
hlcg.a_load_ref_reg(current_asmdata.CurrAsmList,left.resultdef,left.resultdef,left.location.reference,location.reference.base);
end;
LOC_CONSTANT:
begin
hlcg.reference_reset_base(location.reference,left.resultdef,NR_NO,left.location.value,location.reference.alignment);
end;
else
internalerror(2002032218);
end;
if is_ansistring(left.resultdef) then
offsetdec:=1
else
offsetdec:=2;
location.reference.alignment:=offsetdec;
{ in ansistrings/widestrings S[1] is p<w>char(S)[0] }
if not(cs_zerobasedstrings in current_settings.localswitches) then
update_reference_offset(location.reference,-1,offsetdec);
end
else if is_dynamic_array(left.resultdef) then
begin
case left.location.loc of
LOC_REGISTER,
LOC_CREGISTER :
hlcg.reference_reset_base(location.reference,left.resultdef,left.location.register,0,location.reference.alignment);
LOC_REFERENCE,
LOC_CREFERENCE :
begin
hlcg.reference_reset_base(location.reference,left.resultdef,hlcg.getaddressregister(current_asmdata.CurrAsmList,left.resultdef),0,location.reference.alignment);
hlcg.a_load_ref_reg(current_asmdata.CurrAsmList,left.resultdef,left.resultdef,
left.location.reference,location.reference.base);
end;
else
internalerror(2002032219);
end;
{ a dynarray points to the start of a memory block, which
we assume to be always aligned to a multiple of the
pointer size
}
location.reference.alignment:=voidpointertype.size;
end
else
begin
{ may happen in case of function results }
case left.location.loc of
LOC_CSUBSETREG,
LOC_CREGISTER,
LOC_CMMREGISTER,
LOC_SUBSETREG,
LOC_REGISTER,
LOC_MMREGISTER:
hlcg.location_force_mem(current_asmdata.CurrAsmList,left.location,left.resultdef);
end;
location_copy(location,left.location);
end;
{ 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)
{$ifndef cpu64bitalu}
or is_64bitint(resultdef)
{$endif not cpu64bitalu}
) then
update_reference_offset(location.reference,-tarraydef(left.resultdef).lowrange,bytemulsize);
if right.nodetype=ordconstn then
begin
{ offset can only differ from 0 if arraydef }
if cs_check_range in current_settings.localswitches then
begin
secondpass(right);
case left.resultdef.typ of
arraydef :
rangecheck_array;
stringdef :
rangecheck_string;
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
extraoffset:=tordconstnode(right).value.svalue;
update_reference_offset(location.reference,extraoffset,bytemulsize);
{ adjust alignment after this change }
location.reference.alignment:=newalignment(location.reference.alignment,extraoffset*bytemulsize);
end
else
begin
subsetref.ref := location.reference;
subsetref.ref.alignment := left.resultdef.alignment;
if not ispowerof2(packedbitsloadsize(resultdef.packedbitsize),temp) then
internalerror(2006081212);
alignpow:=temp;
update_reference_offset(subsetref.ref,(mulsize * (tordconstnode(right).value.svalue-tarraydef(left.resultdef).lowrange)) shr (3+alignpow),1 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;
rightp:=actualtargetnode(@right);
if rightp^.nodetype=addn then
begin
if taddnode(rightp^).right.nodetype=ordconstn then
begin
extraoffset:=tordconstnode(taddnode(rightp^).right).value.svalue;
replacenode(rightp^,taddnode(rightp^).left);
end
else if taddnode(rightp^).left.nodetype=ordconstn then
begin
extraoffset:=tordconstnode(taddnode(rightp^).left).value.svalue;
replacenode(rightp^,taddnode(rightp^).right);
end;
end
else if rightp^.nodetype=subn then
begin
if taddnode(rightp^).right.nodetype=ordconstn then
begin
extraoffset:=-tordconstnode(taddnode(rightp^).right).value.svalue;
replacenode(rightp^,taddnode(rightp^).left);
end;
end;
update_reference_offset(location.reference,extraoffset,mulsize);
end;
{ calculate from left to right }
if not(location.loc in [LOC_CREFERENCE,LOC_REFERENCE]) then
internalerror(200304237);
secondpass(right);
if (right.expectloc=LOC_JUMP)<>
(right.location.loc=LOC_JUMP) then
internalerror(2006010801);
{ if mulsize = 1, we won't have to modify the index }
if not(right.location.loc in [LOC_CREGISTER,LOC_REGISTER]) or
not valid_index_size(right.location.size) then
begin
hlcg.location_force_reg(current_asmdata.CurrAsmList,right.location,right.resultdef,ptruinttype,true);
indexdef:=ptruinttype
end
else
indexdef:=right.resultdef;
{ produce possible range check code: }
if cs_check_range in current_settings.localswitches then
begin
if left.resultdef.typ=arraydef then
rangecheck_array
else if (left.resultdef.typ=stringdef) then
rangecheck_string;
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,indexdef,mulsize)
else
update_reference_reg_packed(right.location.register,indexdef,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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