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https://gitlab.com/freepascal.org/fpc/source.git
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575 lines
20 KiB
ObjectPascal
575 lines
20 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 2000-2002 by Florian Klaempfl
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Generate assembler for nodes that handle type conversions which are
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the same for all (most) processors
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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unit ncgcnv;
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{$i fpcdefs.inc}
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interface
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uses
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node,ncnv,defutil,defcmp;
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type
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tcgtypeconvnode = class(ttypeconvnode)
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procedure second_int_to_int;override;
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procedure second_cstring_to_pchar;override;
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procedure second_string_to_chararray;override;
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procedure second_array_to_pointer;override;
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procedure second_pointer_to_array;override;
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procedure second_char_to_string;override;
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procedure second_real_to_real;override;
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procedure second_cord_to_pointer;override;
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procedure second_proc_to_procvar;override;
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procedure second_bool_to_int;override;
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procedure second_bool_to_bool;override;
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procedure second_ansistring_to_pchar;override;
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procedure second_class_to_intf;override;
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procedure second_char_to_char;override;
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procedure second_nothing;override;
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procedure pass_2;override;
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end;
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tcgasnode = class(tasnode)
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procedure pass_2;override;
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end;
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implementation
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uses
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cutils,verbose,globtype,globals,
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aasmbase,aasmtai,aasmcpu,symconst,symdef,paramgr,
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ncon,ncal,
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cpubase,systems,
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pass_2,
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cgbase,
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cgutils,cgobj,
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ncgutil,
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tgobj
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;
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procedure tcgtypeconvnode.second_int_to_int;
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var
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newsize : tcgsize;
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ressize,
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leftsize : longint;
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begin
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newsize:=def_cgsize(resulttype.def);
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{ insert range check if not explicit conversion }
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if not(nf_explicit in flags) then
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cg.g_rangecheck(exprasmlist,left.location,left.resulttype.def,resulttype.def);
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{ is the result size smaller? when typecasting from void
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we always reuse the current location, because there is
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nothing that we can load in a register }
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ressize := resulttype.def.size;
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leftsize := left.resulttype.def.size;
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if (ressize<>leftsize) and
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not is_void(left.resulttype.def) then
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begin
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location_copy(location,left.location);
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{ reuse a loc_reference when the newsize is smaller than
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than the original, else load it to a register }
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if (location.loc in [LOC_REFERENCE,LOC_CREFERENCE]) and
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(ressize<leftsize) then
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begin
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location.size:=newsize;
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if (target_info.endian = ENDIAN_BIG) then
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inc(location.reference.offset,leftsize-ressize);
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end
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else
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location_force_reg(exprasmlist,location,newsize,false);
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end
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else
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begin
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{ no special loading is required, reuse current location }
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location_copy(location,left.location);
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location.size:=newsize;
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end;
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end;
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procedure tcgtypeconvnode.second_cstring_to_pchar;
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var
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hr : treference;
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begin
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location_reset(location,LOC_REGISTER,OS_ADDR);
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case tstringdef(left.resulttype.def).string_typ of
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st_shortstring :
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begin
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inc(left.location.reference.offset);
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location.register:=cg.getaddressregister(exprasmlist);
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cg.a_loadaddr_ref_reg(exprasmlist,left.location.reference,location.register);
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end;
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{$ifdef ansistring_bits}
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st_ansistring16,st_ansistring32,st_ansistring64 :
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{$else}
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st_ansistring :
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{$endif}
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begin
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if (left.nodetype=stringconstn) and
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(str_length(left)=0) then
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begin
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reference_reset(hr);
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hr.symbol:=objectlibrary.newasmsymbol('FPC_EMPTYCHAR',AB_EXTERNAL,AT_DATA);
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location.register:=cg.getaddressregister(exprasmlist);
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cg.a_loadaddr_ref_reg(exprasmlist,hr,location.register);
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end
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else
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begin
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location.register:=cg.getaddressregister(exprasmlist);
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cg.a_load_ref_reg(exprasmlist,OS_ADDR,OS_ADDR,left.location.reference,location.register);
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end;
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end;
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st_longstring:
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begin
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{!!!!!!!}
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internalerror(8888);
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end;
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st_widestring:
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begin
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if (left.nodetype=stringconstn) and
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(str_length(left)=0) then
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begin
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reference_reset(hr);
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hr.symbol:=objectlibrary.newasmsymbol('FPC_EMPTYCHAR',AB_EXTERNAL,AT_DATA);
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location.register:=cg.getaddressregister(exprasmlist);
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cg.a_loadaddr_ref_reg(exprasmlist,hr,location.register);
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end
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else
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begin
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location.register:=cg.getintregister(exprasmlist,OS_INT);
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{$ifdef fpc}
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{$warning Todo: convert widestrings to ascii when typecasting them to pchars}
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{$endif}
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cg.a_load_ref_reg(exprasmlist,OS_ADDR,OS_INT,left.location.reference,
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location.register);
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end;
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end;
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end;
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end;
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procedure tcgtypeconvnode.second_string_to_chararray;
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var
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arrsize: longint;
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begin
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with tarraydef(resulttype.def) do
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arrsize := highrange-lowrange+1;
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if (left.nodetype = stringconstn) and
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{ left.length+1 since there's always a terminating #0 character (JM) }
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(tstringconstnode(left).len+1 >= arrsize) and
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(tstringdef(left.resulttype.def).string_typ=st_shortstring) then
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begin
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location_copy(location,left.location);
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inc(location.reference.offset);
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exit;
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end
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else
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{ should be handled already in resulttype pass (JM) }
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internalerror(200108292);
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end;
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procedure tcgtypeconvnode.second_array_to_pointer;
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begin
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location_reset(location,LOC_REGISTER,OS_ADDR);
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location.register:=cg.getaddressregister(exprasmlist);
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cg.a_loadaddr_ref_reg(exprasmlist,left.location.reference,location.register);
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end;
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procedure tcgtypeconvnode.second_pointer_to_array;
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begin
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location_reset(location,LOC_REFERENCE,OS_NO);
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case left.location.loc of
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LOC_REGISTER :
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begin
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{$ifdef cpu_uses_separate_address_registers}
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if getregtype(left.location.register)<>R_ADDRESSREGISTER then
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begin
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location.reference.base:=rg.getaddressregister(exprasmlist);
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cg.a_load_reg_reg(exprasmlist,OS_ADDR,OS_ADDR,
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left.location.register,location.reference.base);
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end
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else
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{$endif}
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location.reference.base := left.location.register;
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end;
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LOC_CREGISTER :
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begin
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location.reference.base:=cg.getaddressregister(exprasmlist);
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cg.a_load_reg_reg(exprasmlist,OS_ADDR,OS_ADDR,left.location.register,
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location.reference.base);
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end;
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LOC_REFERENCE,
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LOC_CREFERENCE :
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begin
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location.reference.base:=cg.getaddressregister(exprasmlist);
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cg.a_load_ref_reg(exprasmlist,OS_ADDR,OS_ADDR,left.location.reference,
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location.reference.base);
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location_freetemp(exprasmlist,left.location);
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end;
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else
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internalerror(2002032216);
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end;
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end;
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procedure tcgtypeconvnode.second_char_to_string;
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begin
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location_reset(location,LOC_REFERENCE,OS_NO);
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case tstringdef(resulttype.def).string_typ of
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st_shortstring :
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begin
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tg.GetTemp(exprasmlist,256,tt_normal,location.reference);
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cg.a_load_loc_ref(exprasmlist,left.location.size,left.location,
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location.reference);
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location_freetemp(exprasmlist,left.location);
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end;
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{ the rest is removed in the resulttype pass and converted to compilerprocs }
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else
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internalerror(4179);
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end;
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end;
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procedure tcgtypeconvnode.second_real_to_real;
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begin
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location_reset(location,LOC_FPUREGISTER,def_cgsize(resulttype.def));
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case left.location.loc of
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LOC_FPUREGISTER,
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LOC_CFPUREGISTER:
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begin
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location_copy(location,left.location);
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location.size:=def_cgsize(resulttype.def);
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case expectloc of
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LOC_FPUREGISTER:
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;
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LOC_MMREGISTER:
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location_force_mmregscalar(exprasmlist,location,false);
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else
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internalerror(2003012262);
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end;
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exit
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end;
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LOC_CREFERENCE,
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LOC_REFERENCE:
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begin
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location.register:=cg.getfpuregister(exprasmlist,left.location.size);
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cg.a_loadfpu_loc_reg(exprasmlist,left.location,location.register);
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location_freetemp(exprasmlist,left.location);
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end;
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LOC_MMREGISTER,
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LOC_CMMREGISTER:
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begin
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location_copy(location,left.location);
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case expectloc of
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LOC_FPUREGISTER:
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begin
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location_force_fpureg(exprasmlist,location,false);
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location.size:=def_cgsize(resulttype.def);
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end;
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LOC_MMREGISTER:
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;
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else
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internalerror(2003012261);
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end;
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end;
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else
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internalerror(2002032215);
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end;
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end;
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procedure tcgtypeconvnode.second_cord_to_pointer;
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begin
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{ this can't happen because constants are already processed in
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pass 1 }
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internalerror(47423985);
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end;
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procedure tcgtypeconvnode.second_proc_to_procvar;
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begin
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{ method pointer ? }
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if tabstractprocdef(left.resulttype.def).is_methodpointer and
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not(tabstractprocdef(left.resulttype.def).is_addressonly) then
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begin
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location_copy(location,left.location);
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end
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else
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begin
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location_reset(location,LOC_REGISTER,OS_ADDR);
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location.register:=cg.getaddressregister(exprasmlist);
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cg.a_loadaddr_ref_reg(exprasmlist,left.location.reference,location.register);
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end;
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end;
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procedure tcgtypeconvnode.second_bool_to_int;
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var
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oldtruelabel,oldfalselabel : tasmlabel;
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begin
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oldtruelabel:=truelabel;
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oldfalselabel:=falselabel;
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objectlibrary.getlabel(truelabel);
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objectlibrary.getlabel(falselabel);
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secondpass(left);
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location_copy(location,left.location);
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{ byte(boolean) or word(wordbool) or longint(longbool) must }
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{ be accepted for var parameters }
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if not((nf_explicit in flags) and
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(left.resulttype.def.size=resulttype.def.size) and
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(left.location.loc in [LOC_REFERENCE,LOC_CREFERENCE,LOC_CREGISTER])) then
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location_force_reg(exprasmlist,location,def_cgsize(resulttype.def),false);
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truelabel:=oldtruelabel;
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falselabel:=oldfalselabel;
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end;
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procedure tcgtypeconvnode.second_bool_to_bool;
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begin
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{ we can reuse the conversion already available
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in bool_to_int to resize the value. But when the
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size of the new boolean is smaller we need to calculate
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the value as is done in int_to_bool. This is needed because
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the bits that define the true status can be outside the limits
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of the new size and truncating the register can result in a 0
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value }
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if resulttype.def.size<left.resulttype.def.size then
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second_int_to_bool
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else
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second_bool_to_int;
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end;
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procedure tcgtypeconvnode.second_ansistring_to_pchar;
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var
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l1 : tasmlabel;
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hr : treference;
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begin
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location_reset(location,LOC_REGISTER,OS_ADDR);
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objectlibrary.getlabel(l1);
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case left.location.loc of
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LOC_CREGISTER,LOC_REGISTER:
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begin
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{$ifdef cpu_uses_separate_address_registers}
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if getregtype(left.location.register)<>R_ADDRESSREGISTER then
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begin
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location.register:=cg.getaddressregister(exprasmlist);
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cg.a_load_reg_reg(exprasmlist,OS_ADDR,OS_ADDR,
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left.location.register,location.register);
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end
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else
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{$endif}
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location.register := left.location.register;
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end;
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LOC_CREFERENCE,LOC_REFERENCE:
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begin
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location.register:=cg.getaddressregister(exprasmlist);
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cg.a_load_ref_reg(exprasmlist,OS_ADDR,OS_ADDR,left.location.reference,location.register);
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// location_freetemp(exprasmlist,left.location);
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end;
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else
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internalerror(2002032214);
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end;
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cg.a_cmp_const_reg_label(exprasmlist,OS_ADDR,OC_NE,0,location.register,l1);
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reference_reset(hr);
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hr.symbol:=objectlibrary.newasmsymbol('FPC_EMPTYCHAR',AB_EXTERNAL,AT_DATA);
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cg.a_loadaddr_ref_reg(exprasmlist,hr,location.register);
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cg.a_label(exprasmlist,l1);
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end;
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procedure tcgtypeconvnode.second_class_to_intf;
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var
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l1 : tasmlabel;
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hd : tobjectdef;
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begin
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location_reset(location,LOC_REGISTER,OS_ADDR);
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case left.location.loc of
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LOC_CREFERENCE,
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LOC_REFERENCE:
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begin
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location.register:=cg.getaddressregister(exprasmlist);
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cg.a_load_ref_reg(exprasmlist,OS_ADDR,OS_ADDR,left.location.reference,location.register);
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location_freetemp(exprasmlist,left.location);
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end;
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LOC_CREGISTER:
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begin
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location.register:=cg.getaddressregister(exprasmlist);
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cg.a_load_reg_reg(exprasmlist,OS_ADDR,OS_ADDR,left.location.register,location.register);
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end;
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LOC_REGISTER:
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location.register:=left.location.register;
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else
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internalerror(121120001);
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end;
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objectlibrary.getlabel(l1);
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cg.a_cmp_const_reg_label(exprasmlist,OS_ADDR,OC_EQ,0,location.register,l1);
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hd:=tobjectdef(left.resulttype.def);
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while assigned(hd) do
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begin
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if hd.implementedinterfaces.searchintf(resulttype.def)<>-1 then
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begin
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cg.a_op_const_reg(exprasmlist,OP_ADD,OS_ADDR,
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hd.implementedinterfaces.ioffsets(
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hd.implementedinterfaces.searchintf(resulttype.def))^,location.register);
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break;
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end;
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hd:=hd.childof;
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end;
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if hd=nil then
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internalerror(2002081301);
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cg.a_label(exprasmlist,l1);
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end;
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procedure tcgtypeconvnode.second_char_to_char;
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begin
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{$ifdef fpc}
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{$warning todo: add RTL routine for widechar-char conversion }
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{$endif}
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{ Quick hack to at least generate 'working' code (PFV) }
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second_int_to_int;
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end;
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procedure tcgtypeconvnode.second_nothing;
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begin
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{ we reuse the old value }
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location_copy(location,left.location);
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{ Floats should never be returned as LOC_CONSTANT, do the
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moving to memory before the new size is set }
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if (resulttype.def.deftype=floatdef) and
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(location.loc=LOC_CONSTANT) then
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location_force_mem(exprasmlist,location);
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{ but use the new size, but we don't know the size of all arrays }
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location.size:=def_cgsize(resulttype.def);
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if location.loc in [LOC_REGISTER,LOC_CREGISTER] then
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location.register:=cg.makeregsize(exprasmlist,location.register,location.size);
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end;
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{$ifdef TESTOBJEXT2}
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procedure tcgtypeconvnode.checkobject;
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begin
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{ no checking by default }
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end;
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{$endif TESTOBJEXT2}
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procedure tcgtypeconvnode.pass_2;
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begin
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{ the boolean routines can be called with LOC_JUMP and
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call secondpass themselves in the helper }
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if not(convtype in [tc_bool_2_int,tc_bool_2_bool,tc_int_2_bool]) then
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begin
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secondpass(left);
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if codegenerror then
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exit;
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end;
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second_call_helper(convtype);
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{$ifdef TESTOBJEXT2}
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{ Check explicit conversions to objects pointers !! }
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if p^.explizit and
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(p^.resulttype.def.deftype=pointerdef) and
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(tpointerdef(p^.resulttype.def).definition.deftype=objectdef) and not
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(tobjectdef(tpointerdef(p^.resulttype.def).definition).isclass) and
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((tobjectdef(tpointerdef(p^.resulttype.def).definition).options and oo_hasvmt)<>0) and
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(cs_check_range in aktlocalswitches) then
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checkobject;
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{$endif TESTOBJEXT2}
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end;
|
|
|
|
|
|
procedure tcgasnode.pass_2;
|
|
begin
|
|
secondpass(call);
|
|
location_copy(location,call.location);
|
|
end;
|
|
|
|
|
|
begin
|
|
ctypeconvnode := tcgtypeconvnode;
|
|
casnode := tcgasnode;
|
|
end.
|
|
|
|
{
|
|
$Log$
|
|
Revision 1.63 2004-11-01 17:41:28 florian
|
|
* fixed arm compilation with cgutils
|
|
* ...
|
|
|
|
Revision 1.62 2004/11/01 15:31:58 peter
|
|
* -Or fix for absolute
|
|
|
|
Revision 1.61 2004/10/31 21:45:03 peter
|
|
* generic tlocation
|
|
* move tlocation to cgutils
|
|
|
|
Revision 1.60 2004/09/25 14:23:54 peter
|
|
* ungetregister is now only used for cpuregisters, renamed to
|
|
ungetcpuregister
|
|
* renamed (get|unget)explicitregister(s) to ..cpuregister
|
|
* removed location-release/reference_release
|
|
|
|
Revision 1.59 2004/06/20 08:55:29 florian
|
|
* logs truncated
|
|
|
|
Revision 1.58 2004/06/16 20:07:08 florian
|
|
* dwarf branch merged
|
|
|
|
Revision 1.57 2004/04/29 19:56:37 daniel
|
|
* Prepare compiler infrastructure for multiple ansistring types
|
|
|
|
Revision 1.56.2.1 2004/04/27 18:18:25 peter
|
|
* aword -> aint
|
|
|
|
Revision 1.56 2004/03/02 00:36:33 olle
|
|
* big transformation of Tai_[const_]Symbol.Create[data]name*
|
|
|
|
Revision 1.55 2004/02/27 10:21:05 florian
|
|
* top_symbol killed
|
|
+ refaddr to treference added
|
|
+ refsymbol to treference added
|
|
* top_local stuff moved to an extra record to save memory
|
|
+ aint introduced
|
|
* tppufile.get/putint64/aint implemented
|
|
|
|
}
|