mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-04-26 20:23:42 +02:00
e815b923d5
* fixed downsizing the precision of floating point values
* floating point constants are now treated using only the minimal
precision required (e.g. 2.0 is now a single, 1.1 extended etc)
(Delphi compatible)
git-svn-id: trunk@5927 -
689 lines
26 KiB
ObjectPascal
689 lines
26 KiB
ObjectPascal
{
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Copyright (c) 2002 by Florian Klaempfl
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PowerPC specific calling conventions
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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 cpupara;
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{$i fpcdefs.inc}
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interface
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uses
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globtype,
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aasmtai,aasmdata,
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cpubase,
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symconst,symtype,symdef,symsym,
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paramgr,parabase,cgbase;
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type
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tppcparamanager = class(tparamanager)
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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 push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override;
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procedure getintparaloc(calloption : tproccalloption; nr : longint;var cgpara:TCGPara);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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procedure create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
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private
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procedure init_values(var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword);
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function create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras:tparalist;
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var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword; varargsparas: boolean):longint;
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function parseparaloc(p : tparavarsym;const s : string) : boolean;override;
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end;
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implementation
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uses
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verbose,systems,
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defutil,
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cgutils,
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procinfo,cpupi;
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function tppcparamanager.get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;
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begin
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if (target_info.system = system_powerpc_darwin) then
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result := [RS_R2..RS_R12]
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else
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result := [RS_R3..RS_R12];
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end;
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function tppcparamanager.get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;
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begin
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case target_info.abi of
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abi_powerpc_aix,
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abi_powerpc_sysv:
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result := [RS_F0..RS_F13];
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else
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internalerror(2003091401);
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end;
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end;
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procedure tppcparamanager.getintparaloc(calloption : tproccalloption; nr : longint;var cgpara:TCGPara);
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var
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paraloc : pcgparalocation;
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begin
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cgpara.reset;
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cgpara.size:=OS_INT;
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cgpara.intsize:=tcgsize2size[OS_INT];
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cgpara.alignment:=get_para_align(calloption);
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paraloc:=cgpara.add_location;
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with paraloc^ do
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begin
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size:=OS_INT;
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if (nr<=8) then
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begin
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if nr=0 then
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internalerror(200309271);
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loc:=LOC_REGISTER;
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register:=newreg(R_INTREGISTER,RS_R2+nr,R_SUBWHOLE);
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end
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else
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begin
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loc:=LOC_REFERENCE;
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paraloc^.reference.index:=NR_STACK_POINTER_REG;
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if (target_info.abi <> abi_powerpc_aix) then
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reference.offset:=sizeof(aint)*(nr-8)
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else
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reference.offset:=sizeof(aint)*(nr);
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end;
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end;
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end;
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function getparaloc(p : tdef) : tcgloc;
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begin
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{ Later, the LOC_REFERENCE is in most cases changed into LOC_REGISTER
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if push_addr_param for the def is true
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}
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case p.typ of
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orddef:
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result:=LOC_REGISTER;
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floatdef:
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result:=LOC_FPUREGISTER;
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enumdef:
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result:=LOC_REGISTER;
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pointerdef:
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result:=LOC_REGISTER;
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formaldef:
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result:=LOC_REGISTER;
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classrefdef:
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result:=LOC_REGISTER;
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recorddef:
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if (target_info.abi<>abi_powerpc_aix) or
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((p.size >= 3) and
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((p.size mod 4) <> 0)) then
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result:=LOC_REFERENCE
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else
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result:=LOC_REGISTER;
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objectdef:
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if is_object(p) then
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result:=LOC_REFERENCE
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else
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result:=LOC_REGISTER;
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stringdef:
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if is_shortstring(p) or is_longstring(p) then
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result:=LOC_REFERENCE
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else
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result:=LOC_REGISTER;
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procvardef:
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if (po_methodpointer in tprocvardef(p).procoptions) then
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result:=LOC_REFERENCE
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else
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result:=LOC_REGISTER;
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filedef:
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result:=LOC_REGISTER;
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arraydef:
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result:=LOC_REFERENCE;
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setdef:
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if is_smallset(p) then
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result:=LOC_REGISTER
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else
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result:=LOC_REFERENCE;
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variantdef:
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result:=LOC_REFERENCE;
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{ avoid problems with errornous definitions }
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errordef:
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result:=LOC_REGISTER;
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else
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internalerror(2002071001);
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end;
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end;
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function tppcparamanager.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 always require address }
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if varspez in [vs_var,vs_out] 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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variantdef,
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formaldef :
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result:=true;
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recorddef:
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result :=
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(target_info.abi<>abi_powerpc_aix) or
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((varspez = vs_const) and
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((calloption = pocall_mwpascal) or
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(not (calloption in [pocall_cdecl,pocall_cppdecl]) and
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(def.size > 8)
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)
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)
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);
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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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objectdef :
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result:=is_object(def);
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setdef :
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result:=(tsetdef(def).settype<>smallset);
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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:=po_methodpointer in tprocvardef(def).procoptions;
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end;
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end;
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procedure tppcparamanager.init_values(var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword);
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begin
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case target_info.abi of
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abi_powerpc_aix:
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cur_stack_offset:=24;
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abi_powerpc_sysv:
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cur_stack_offset:=8;
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else
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internalerror(2003051901);
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end;
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curintreg:=RS_R3;
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curfloatreg:=RS_F1;
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curmmreg:=RS_M1;
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end;
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procedure tppcparamanager.create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
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var
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retcgsize : tcgsize;
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begin
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{ Constructors return self instead of a boolean }
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if (p.proctypeoption=potype_constructor) then
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retcgsize:=OS_ADDR
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else
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retcgsize:=def_cgsize(p.returndef);
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location_reset(p.funcretloc[side],LOC_INVALID,OS_NO);
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p.funcretloc[side].size:=retcgsize;
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{ void has no location }
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if is_void(p.returndef) then
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begin
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p.funcretloc[side].loc:=LOC_VOID;
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exit;
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end;
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{ Return in FPU register? }
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if p.returndef.typ=floatdef then
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begin
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p.funcretloc[side].loc:=LOC_FPUREGISTER;
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p.funcretloc[side].register:=NR_FPU_RESULT_REG;
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p.funcretloc[side].size:=retcgsize;
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end
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else
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{ Return in register? }
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if not ret_in_param(p.returndef,p.proccalloption) then
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begin
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{$ifndef cpu64bit}
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if retcgsize in [OS_64,OS_S64] then
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begin
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{ low 32bits }
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p.funcretloc[side].loc:=LOC_REGISTER;
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if side=callerside then
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p.funcretloc[side].register64.reghi:=NR_FUNCTION_RESULT64_HIGH_REG
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else
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p.funcretloc[side].register64.reghi:=NR_FUNCTION_RETURN64_HIGH_REG;
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{ high 32bits }
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if side=callerside then
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p.funcretloc[side].register64.reglo:=NR_FUNCTION_RESULT64_LOW_REG
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else
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p.funcretloc[side].register64.reglo:=NR_FUNCTION_RETURN64_LOW_REG;
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end
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else
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{$endif cpu64bit}
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begin
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p.funcretloc[side].loc:=LOC_REGISTER;
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p.funcretloc[side].size:=retcgsize;
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if side=callerside then
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p.funcretloc[side].register:=newreg(R_INTREGISTER,RS_FUNCTION_RESULT_REG,cgsize2subreg(retcgsize))
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else
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p.funcretloc[side].register:=newreg(R_INTREGISTER,RS_FUNCTION_RETURN_REG,cgsize2subreg(retcgsize));
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end;
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end
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else
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begin
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p.funcretloc[side].loc:=LOC_REFERENCE;
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p.funcretloc[side].size:=retcgsize;
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end;
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end;
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function tppcparamanager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;
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var
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cur_stack_offset: aword;
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curintreg, curfloatreg, curmmreg: tsuperregister;
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begin
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init_values(curintreg,curfloatreg,curmmreg,cur_stack_offset);
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result := create_paraloc_info_intern(p,side,p.paras,curintreg,curfloatreg,curmmreg,cur_stack_offset,false);
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create_funcretloc_info(p,side);
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end;
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function tppcparamanager.create_paraloc_info_intern(p : tabstractprocdef; side: tcallercallee; paras:tparalist;
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var curintreg, curfloatreg, curmmreg: tsuperregister; var cur_stack_offset: aword; varargsparas: boolean):longint;
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var
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stack_offset: longint;
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paralen: aint;
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nextintreg,nextfloatreg,nextmmreg, maxfpureg : tsuperregister;
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paradef : tdef;
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paraloc : pcgparalocation;
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i : integer;
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hp : tparavarsym;
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loc : tcgloc;
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paracgsize: tcgsize;
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begin
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{$ifdef extdebug}
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if po_explicitparaloc in p.procoptions then
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internalerror(200411141);
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{$endif extdebug}
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result:=0;
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nextintreg := curintreg;
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nextfloatreg := curfloatreg;
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nextmmreg := curmmreg;
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stack_offset := cur_stack_offset;
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case target_info.abi of
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abi_powerpc_aix:
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maxfpureg := RS_F13;
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abi_powerpc_sysv:
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maxfpureg := RS_F8;
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else internalerror(2004070912);
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end;
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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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{ Syscall for Morphos can have already a paraloc set }
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if (vo_has_explicit_paraloc in hp.varoptions) then
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begin
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if not(vo_is_syscall_lib in hp.varoptions) then
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internalerror(200412153);
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continue;
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end;
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hp.paraloc[side].reset;
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{ currently only support C-style array of const }
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if (p.proccalloption in [pocall_cdecl,pocall_cppdecl,pocall_mwpascal]) 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_R0;
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paraloc^.size := OS_ADDR;
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break;
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end;
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if (hp.varspez in [vs_var,vs_out]) or
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push_addr_param(hp.varspez,paradef,p.proccalloption) or
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is_open_array(paradef) or
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is_array_of_const(paradef) then
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begin
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paradef:=voidpointertype;
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loc:=LOC_REGISTER;
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paracgsize := OS_ADDR;
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paralen := tcgsize2size[OS_ADDR];
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end
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else
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begin
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if not is_special_array(paradef) then
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paralen := paradef.size
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else
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paralen := tcgsize2size[def_cgsize(paradef)];
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loc := getparaloc(paradef);
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if (target_info.abi = abi_powerpc_aix) and
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(paradef.typ = recorddef) and
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(hp.varspez in [vs_value,vs_const]) then
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begin
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{ if a record has only one field and that field is }
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{ non-composite (not array or record), it must be }
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{ passed according to the rules of that type. }
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if (trecorddef(hp.vardef).symtable.SymList.count = 1) and
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(not trecorddef(hp.vardef).isunion) and
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((tabstractvarsym(trecorddef(hp.vardef).symtable.SymList[0]).vardef.typ = floatdef) or
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((target_info.system = system_powerpc_darwin) and
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(tabstractvarsym(trecorddef(hp.vardef).symtable.SymList[0]).vardef.typ in [orddef,enumdef]))) then
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begin
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paradef :=
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tabstractvarsym(trecorddef(hp.vardef).symtable.SymList[0]).vardef;
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paracgsize:=def_cgsize(paradef);
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end
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else
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begin
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paracgsize := int_cgsize(paralen);
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end;
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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 things like 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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paralen := tcgsize2size[OS_ADDR];
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end;
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end
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end;
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if varargsparas and
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(target_info.abi = abi_powerpc_aix) and
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(paradef.typ = floatdef) then
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begin
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loc := LOC_REGISTER;
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if paracgsize = OS_F64 then
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paracgsize := OS_64
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else
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paracgsize := OS_32;
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end;
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hp.paraloc[side].alignment:=std_param_align;
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hp.paraloc[side].size:=paracgsize;
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hp.paraloc[side].intsize:=paralen;
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if (target_info.abi = abi_powerpc_aix) and
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(paradef.typ in [recorddef,arraydef]) then
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hp.paraloc[side].composite:=true;
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{$ifndef cpu64bit}
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if (target_info.abi=abi_powerpc_sysv) and
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is_64bit(paradef) and
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odd(nextintreg-RS_R3) then
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inc(nextintreg);
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{$endif not cpu64bit}
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if (paralen = 0) then
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if (paradef.typ = recorddef) then
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begin
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paraloc:=hp.paraloc[side].add_location;
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paraloc^.loc := LOC_VOID;
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end
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else
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internalerror(2005011310);
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{ can become < 0 for e.g. 3-byte records }
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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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if (loc = LOC_REGISTER) and
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(nextintreg <= RS_R10) then
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begin
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paraloc^.loc := loc;
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{ make sure we don't lose whether or not the type is signed }
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if (paradef.typ <> orddef) then
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paracgsize := int_cgsize(paralen);
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if (paracgsize in [OS_NO,OS_64,OS_S64]) then
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paraloc^.size := OS_INT
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else
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paraloc^.size := paracgsize;
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paraloc^.register:=newreg(R_INTREGISTER,nextintreg,R_SUBNONE);
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inc(nextintreg);
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dec(paralen,tcgsize2size[paraloc^.size]);
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if target_info.abi=abi_powerpc_aix then
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inc(stack_offset,align(tcgsize2size[paraloc^.size],4));
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end
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else if (loc = LOC_FPUREGISTER) and
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(nextfloatreg <= maxfpureg) then
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begin
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paraloc^.loc:=loc;
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paraloc^.size := paracgsize;
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paraloc^.register:=newreg(R_FPUREGISTER,nextfloatreg,R_SUBWHOLE);
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inc(nextfloatreg);
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dec(paralen,tcgsize2size[paraloc^.size]);
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{ if nextfpureg > maxfpureg, all intregs are already used, since there }
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{ are less of those available for parameter passing in the AIX abi }
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if target_info.abi=abi_powerpc_aix then
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{$ifndef cpu64bit}
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if (paracgsize = OS_F32) then
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begin
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inc(stack_offset,4);
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if (nextintreg < RS_R11) then
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inc(nextintreg);
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end
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else
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begin
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inc(stack_offset,8);
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if (nextintreg < RS_R10) then
|
|
inc(nextintreg,2)
|
|
else
|
|
nextintreg := RS_R11;
|
|
end;
|
|
{$else not cpu64bit}
|
|
begin
|
|
inc(stack_offset,tcgsize2size[paracgsize]);
|
|
if (nextintreg < RS_R11) then
|
|
inc(nextintreg);
|
|
end;
|
|
{$endif not cpu64bit}
|
|
end
|
|
else { LOC_REFERENCE }
|
|
begin
|
|
paraloc^.loc:=LOC_REFERENCE;
|
|
case loc of
|
|
LOC_FPUREGISTER:
|
|
paraloc^.size:=int_float_cgsize(paralen);
|
|
LOC_REGISTER,
|
|
LOC_REFERENCE:
|
|
paraloc^.size:=int_cgsize(paralen);
|
|
else
|
|
internalerror(2006011101);
|
|
end;
|
|
if (side = callerside) then
|
|
paraloc^.reference.index:=NR_STACK_POINTER_REG
|
|
else
|
|
begin
|
|
paraloc^.reference.index:=NR_R12;
|
|
tppcprocinfo(current_procinfo).needs_frame_pointer := true;
|
|
end;
|
|
|
|
if (target_info.abi = abi_powerpc_aix) and
|
|
(hp.paraloc[side].intsize < 3) then
|
|
paraloc^.reference.offset:=stack_offset+(4-paralen)
|
|
else
|
|
paraloc^.reference.offset:=stack_offset;
|
|
|
|
inc(stack_offset,align(paralen,4));
|
|
while (paralen > 0) and
|
|
(nextintreg < RS_R11) do
|
|
begin
|
|
inc(nextintreg);
|
|
dec(paralen,sizeof(aint));
|
|
end;
|
|
paralen := 0;
|
|
end;
|
|
end;
|
|
end;
|
|
curintreg:=nextintreg;
|
|
curfloatreg:=nextfloatreg;
|
|
curmmreg:=nextmmreg;
|
|
cur_stack_offset:=stack_offset;
|
|
result:=stack_offset;
|
|
end;
|
|
|
|
|
|
function tppcparamanager.create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint;
|
|
var
|
|
cur_stack_offset: aword;
|
|
parasize, l: longint;
|
|
curintreg, firstfloatreg, curfloatreg, curmmreg: tsuperregister;
|
|
i : integer;
|
|
hp: tparavarsym;
|
|
paraloc: pcgparalocation;
|
|
begin
|
|
init_values(curintreg,curfloatreg,curmmreg,cur_stack_offset);
|
|
firstfloatreg:=curfloatreg;
|
|
|
|
result:=create_paraloc_info_intern(p,callerside,p.paras,curintreg,curfloatreg,curmmreg,cur_stack_offset, false);
|
|
if (p.proccalloption in [pocall_cdecl,pocall_cppdecl,pocall_mwpascal]) then
|
|
{ just continue loading the parameters in the registers }
|
|
begin
|
|
result:=create_paraloc_info_intern(p,callerside,varargspara,curintreg,curfloatreg,curmmreg,cur_stack_offset,true);
|
|
{ varargs routines have to reserve at least 32 bytes for the AIX abi }
|
|
if (target_info.abi = abi_powerpc_aix) and
|
|
(result < 32) then
|
|
result := 32;
|
|
end
|
|
else
|
|
begin
|
|
parasize:=cur_stack_offset;
|
|
for i:=0 to varargspara.count-1 do
|
|
begin
|
|
hp:=tparavarsym(varargspara[i]);
|
|
hp.paraloc[callerside].alignment:=4;
|
|
paraloc:=hp.paraloc[callerside].add_location;
|
|
paraloc^.loc:=LOC_REFERENCE;
|
|
paraloc^.size:=def_cgsize(hp.vardef);
|
|
paraloc^.reference.index:=NR_STACK_POINTER_REG;
|
|
l:=push_size(hp.varspez,hp.vardef,p.proccalloption);
|
|
paraloc^.reference.offset:=parasize;
|
|
parasize:=parasize+l;
|
|
end;
|
|
result:=parasize;
|
|
end;
|
|
if curfloatreg<>firstfloatreg then
|
|
include(varargspara.varargsinfo,va_uses_float_reg);
|
|
end;
|
|
|
|
|
|
function tppcparamanager.parseparaloc(p : tparavarsym;const s : string) : boolean;
|
|
var
|
|
paraloc : pcgparalocation;
|
|
paracgsize : tcgsize;
|
|
begin
|
|
result:=false;
|
|
case target_info.system of
|
|
system_powerpc_morphos:
|
|
begin
|
|
paracgsize:=def_cgsize(p.vardef);
|
|
p.paraloc[callerside].alignment:=4;
|
|
p.paraloc[callerside].size:=paracgsize;
|
|
p.paraloc[callerside].intsize:=tcgsize2size[paracgsize];
|
|
paraloc:=p.paraloc[callerside].add_location;
|
|
paraloc^.loc:=LOC_REFERENCE;
|
|
paraloc^.size:=paracgsize;
|
|
paraloc^.reference.index:=newreg(R_INTREGISTER,RS_R2,R_SUBWHOLE);
|
|
{ pattern is always uppercase'd }
|
|
if s='D0' then
|
|
paraloc^.reference.offset:=0
|
|
else if s='D1' then
|
|
paraloc^.reference.offset:=4
|
|
else if s='D2' then
|
|
paraloc^.reference.offset:=8
|
|
else if s='D3' then
|
|
paraloc^.reference.offset:=12
|
|
else if s='D4' then
|
|
paraloc^.reference.offset:=16
|
|
else if s='D5' then
|
|
paraloc^.reference.offset:=20
|
|
else if s='D6' then
|
|
paraloc^.reference.offset:=24
|
|
else if s='D7' then
|
|
paraloc^.reference.offset:=28
|
|
else if s='A0' then
|
|
paraloc^.reference.offset:=32
|
|
else if s='A1' then
|
|
paraloc^.reference.offset:=36
|
|
else if s='A2' then
|
|
paraloc^.reference.offset:=40
|
|
else if s='A3' then
|
|
paraloc^.reference.offset:=44
|
|
else if s='A4' then
|
|
paraloc^.reference.offset:=48
|
|
else if s='A5' then
|
|
paraloc^.reference.offset:=52
|
|
{ 'A6' (offset 56) is used by mossyscall as libbase, so API
|
|
never passes parameters in it,
|
|
Indeed, but this allows to declare libbase either explicitly
|
|
or let the compiler insert it }
|
|
else if s='A6' then
|
|
paraloc^.reference.offset:=56
|
|
{ 'A7' is the stack pointer on 68k, can't be overwritten
|
|
by API calls, so it has no offset }
|
|
{ 'R12' is special, used internally to support r12base sysv
|
|
calling convention }
|
|
else if s='R12' then
|
|
begin
|
|
paraloc^.loc:=LOC_REGISTER;
|
|
paraloc^.size:=OS_ADDR;
|
|
paraloc^.register:=NR_R12;
|
|
end
|
|
else
|
|
exit;
|
|
|
|
{ copy to callee side }
|
|
p.paraloc[calleeside].add_location^:=paraloc^;
|
|
end;
|
|
else
|
|
internalerror(200404182);
|
|
end;
|
|
result:=true;
|
|
end;
|
|
|
|
{
|
|
|
|
breaks e.g. tests/test/cg/tpara1
|
|
|
|
procedure tppcparamanager.createtempparaloc(list: TAsmList;calloption : tproccalloption;parasym : tparavarsym;var cgpara:TCGPara);
|
|
var
|
|
paraloc : pcgparalocation;
|
|
begin
|
|
paraloc:=parasym.paraloc[callerside].location;
|
|
{ No need for temps when value is pushed }
|
|
if assigned(paraloc) and
|
|
(paraloc^.loc=LOC_REFERENCE) and
|
|
(paraloc^.reference.index=NR_STACK_POINTER_REG) then
|
|
duplicateparaloc(list,calloption,parasym,cgpara)
|
|
else
|
|
inherited createtempparaloc(list,calloption,parasym,cgpara);
|
|
end;
|
|
}
|
|
|
|
|
|
begin
|
|
paramanager:=tppcparamanager.create;
|
|
end.
|