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+{
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+ Copyright (c) 1998-2002 by Florian Klaempfl
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+
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+ Calling conventions for the SPARC
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+
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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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+
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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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+
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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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+unit sppara;
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+
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+{$i fpcdefs.inc}
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+
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+interface
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+
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+ uses
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+ globtype,
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+ cclasses,
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+ aasmtai,aasmdata,
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+ cpubase,cpuinfo,
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+ symconst,symbase,symsym,symtype,symdef,paramgr,parabase,cgbase,cgutils;
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+
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+ type
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+ tsparcparamanager=class(TParaManager)
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+ function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override;
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+ function get_volatile_registers_int(calloption : tproccalloption):TCpuRegisterSet;override;
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+ function get_volatile_registers_fpu(calloption : tproccalloption):TCpuRegisterSet;override;
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+ function create_paraloc_info(p : TAbstractProcDef; side: tcallercallee):longint;override;
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+ function create_varargs_paraloc_info(p : TAbstractProcDef; varargspara:tvarargsparalist):longint;override;
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+ function get_funcretloc(p : tabstractprocdef; side: tcallercallee; forcetempdef: tdef): tcgpara;override;
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+ private
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+ procedure create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras: tparalist;
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+ var intparareg,parasize:longint);
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+ end;
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+
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+implementation
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+
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+ uses
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+ cutils,verbose,systems,
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+ defutil,
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+ cgobj;
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+
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+ type
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+ tparasupregs = array[0..5] of tsuperregister;
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+ pparasupregs = ^tparasupregs;
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+ const
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+ paraoutsupregs : tparasupregs = (RS_O0,RS_O1,RS_O2,RS_O3,RS_O4,RS_O5);
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+ parainsupregs : tparasupregs = (RS_I0,RS_I1,RS_I2,RS_I3,RS_I4,RS_I5);
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+
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+
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+ function tsparcparamanager.get_volatile_registers_int(calloption : tproccalloption):TCpuRegisterSet;
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+ begin
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+ result:=[RS_G1,RS_O0,RS_O1,RS_O2,RS_O3,RS_O4,RS_O5,RS_O6,RS_O7];
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+ end;
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+
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+
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+ function tsparcparamanager.get_volatile_registers_fpu(calloption : tproccalloption):TCpuRegisterSet;
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+ begin
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+ result:=[RS_F0..RS_F31];
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+ end;
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+
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+
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+ { true if a parameter is too large to copy and only the address is pushed }
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+ function tsparcparamanager.push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;
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+ begin
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+ result:=false;
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+ { var,out,constref always require address }
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+ if varspez in [vs_var,vs_out,vs_constref] then
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+ begin
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+ result:=true;
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+ exit;
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+ end;
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+ case def.typ of
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+ arraydef:
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+ result:=(tarraydef(def).highrange>=tarraydef(def).lowrange) or
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+ is_open_array(def) or
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+ is_array_of_const(def) or
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+ is_array_constructor(def);
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+ recorddef,
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+ variantdef,
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+ formaldef :
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+ result:=true;
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+ objectdef :
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+ result:=is_object(def);
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+ stringdef :
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+ result:=(tstringdef(def).stringtype in [st_shortstring,st_longstring]);
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+ procvardef :
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+ result:=not tprocvardef(def).is_addressonly;
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+ setdef :
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+ result:=not is_smallset(def);
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+ end;
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+ end;
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+
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+
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+ function tsparcparamanager.get_funcretloc(p : tabstractprocdef; side: tcallercallee; forcetempdef: tdef): tcgpara;
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+ var
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+ paraloc : pcgparalocation;
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+ retcgsize : tcgsize;
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+ begin
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+ if set_common_funcretloc_info(p,forcetempdef,retcgsize,result) then
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+ exit;
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+
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+ paraloc:=result.add_location;
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+ { Return in FPU register? }
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+ if result.def.typ=floatdef then
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+ begin
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+ paraloc^.loc:=LOC_FPUREGISTER;
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+ paraloc^.register:=NR_FPU_RESULT_REG;
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+ if retcgsize=OS_F64 then
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+ setsubreg(paraloc^.register,R_SUBFD);
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+ paraloc^.size:=retcgsize;
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+ paraloc^.def:=result.def;
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+ end
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+ else
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+ { Return in register }
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+ begin
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+{$ifndef cpu64bitaddr}
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+ if retcgsize in [OS_64,OS_S64] then
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+ begin
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+ paraloc^.loc:=LOC_REGISTER;
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+ { high }
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+ if side=callerside then
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+ paraloc^.register:=NR_FUNCTION_RESULT64_HIGH_REG
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+ else
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+ paraloc^.register:=NR_FUNCTION_RETURN64_HIGH_REG;
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+ paraloc^.size:=OS_32;
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+ paraloc^.def:=u32inttype;
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+ { low }
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+ paraloc:=result.add_location;
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+ paraloc^.loc:=LOC_REGISTER;
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+ if side=callerside then
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+ paraloc^.register:=NR_FUNCTION_RESULT64_LOW_REG
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+ else
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+ paraloc^.register:=NR_FUNCTION_RETURN64_LOW_REG;
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+ paraloc^.size:=OS_32;
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+ paraloc^.def:=u32inttype;
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+ end
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+ else
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+{$endif not cpu64bitaddr}
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+ begin
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+ paraloc^.loc:=LOC_REGISTER;
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+ paraloc^.size:=retcgsize;
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+ paraloc^.def:=result.def;
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+ if (side=callerside) then
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+ paraloc^.register:=newreg(R_INTREGISTER,RS_FUNCTION_RESULT_REG,cgsize2subreg(R_INTREGISTER,retcgsize))
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+ else
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+ paraloc^.register:=newreg(R_INTREGISTER,RS_FUNCTION_RETURN_REG,cgsize2subreg(R_INTREGISTER,retcgsize));
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+ end;
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+ end;
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+ end;
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+
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+
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+ procedure tsparcparamanager.create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee;paras:tparalist;
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+ var intparareg,parasize:longint);
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+ var
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+ paraloc : pcgparalocation;
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+ i : integer;
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+ hp : tparavarsym;
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+ paradef : tdef;
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+ paracgsize : tcgsize;
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+ hparasupregs : pparasupregs;
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+ paralen : longint;
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+ begin
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+ if side=callerside then
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+ hparasupregs:=@paraoutsupregs
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+ else
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+ hparasupregs:=@parainsupregs;
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+ for i:=0 to paras.count-1 do
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+ begin
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+ hp:=tparavarsym(paras[i]);
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+ paradef:=hp.vardef;
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+ { currently only support C-style array of const,
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+ there should be no location assigned to the vararg array itself }
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+ if (p.proccalloption in cstylearrayofconst) and
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+ is_array_of_const(paradef) then
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+ begin
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+ paraloc:=hp.paraloc[side].add_location;
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+ { hack: the paraloc must be valid, but is not actually used }
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+ paraloc^.loc:=LOC_REGISTER;
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+ paraloc^.register:=NR_G0;
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+ paraloc^.size:=OS_ADDR;
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+ paraloc^.def:=voidpointertype;
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+ break;
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+ end;
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+
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+ if push_addr_param(hp.varspez,paradef,p.proccalloption) then
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+ begin
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+ paracgsize:=OS_ADDR;
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+ paradef:=cpointerdef.getreusable_no_free(paradef);
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+ end
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+ else
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+ begin
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+ paracgsize:=def_cgsize(paradef);
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+ { for formaldef }
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+ if paracgsize=OS_NO then
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+ begin
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+ paracgsize:=OS_ADDR;
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+ paradef:=voidpointertype;
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+ end;
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+ end;
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+ hp.paraloc[side].reset;
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+ hp.paraloc[side].size:=paracgsize;
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+ hp.paraloc[side].def:=paradef;
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+ if (side = callerside) then
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+ hp.paraloc[side].Alignment:=std_param_align
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+ else
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+ hp.paraloc[side].Alignment:=paradef.alignment;
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+ paralen:=tcgsize2size[paracgsize];
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+ hp.paraloc[side].intsize:=paralen;
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+ while paralen>0 do
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+ begin
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+ paraloc:=hp.paraloc[side].add_location;
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+ { Floats are passed in int registers,
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+ We can allocate at maximum 32 bits per register }
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+ if paracgsize in [OS_64,OS_S64,OS_F32,OS_F64] then
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+ begin
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+ paraloc^.size:=OS_32;
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+ paraloc^.def:=u32inttype;
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+ end
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+ else
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+ begin
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+ paraloc^.size:=paracgsize;
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+ paraloc^.def:=paradef;
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+ end;
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+ { ret in param? }
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+ if vo_is_funcret in hp.varoptions then
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+ begin
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+ paraloc^.loc:=LOC_REFERENCE;
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+ if side=callerside then
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+ paraloc^.reference.index:=NR_STACK_POINTER_REG
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+ else
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+ paraloc^.reference.index:=NR_FRAME_POINTER_REG;
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+ paraloc^.reference.offset:=64;
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+ end
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+ { In case of po_delphi_nested_cc, the parent frame pointer
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+ is always passed on the stack. }
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+ else if (intparareg<=high(tparasupregs)) and
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+ (not(vo_is_parentfp in hp.varoptions) or
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+ not(po_delphi_nested_cc in p.procoptions)) then
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+ begin
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+ paraloc^.loc:=LOC_REGISTER;
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+ paraloc^.register:=newreg(R_INTREGISTER,hparasupregs^[intparareg],R_SUBWHOLE);
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+ inc(intparareg);
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+ end
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+ else
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+ begin
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+ paraloc^.loc:=LOC_REFERENCE;
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+ if side=callerside then
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+ paraloc^.reference.index:=NR_STACK_POINTER_REG
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+ else
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+ paraloc^.reference.index:=NR_FRAME_POINTER_REG;
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+ paraloc^.reference.offset:=target_info.first_parm_offset+parasize;
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+
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+ if (target_info.endian=endian_big) and
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+ (paralen<tcgsize2size[OS_INT]) and
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+ (paradef.typ<>recorddef) then
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+ inc(paraloc^.reference.offset,4-paralen);
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+
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+ { Parameters are aligned at 4 bytes }
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+ inc(parasize,align(tcgsize2size[paraloc^.size],sizeof(pint)));
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+ end;
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+ dec(paralen,tcgsize2size[paraloc^.size]);
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+ end;
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+ end;
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+ end;
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+
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+
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+ function tsparcparamanager.create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint;
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+ var
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+ intparareg,
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+ parasize : longint;
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+ begin
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+ intparareg:=0;
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+ parasize:=0;
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+ { calculate the registers for the normal parameters }
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+ create_paraloc_info_intern(p,callerside,p.paras,intparareg,parasize);
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+ { append the varargs }
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+ create_paraloc_info_intern(p,callerside,varargspara,intparareg,parasize);
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+ result:=parasize;
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+ end;
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+
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+
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+
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+ function tsparcparamanager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;
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+ var
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+ intparareg,
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+ parasize : longint;
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+ begin
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+ intparareg:=0;
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+ parasize:=0;
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+ create_paraloc_info_intern(p,side,p.paras,intparareg,parasize);
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+ { Create Function result paraloc }
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+ create_funcretloc_info(p,side);
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+ { We need to return the size allocated on the stack }
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+ result:=parasize;
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+ end;
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+
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+
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+end.
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