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573 lines
20 KiB
ObjectPascal
573 lines
20 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 2002 by Florian Klaempfl
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Generates the argument location information for i386
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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 bymethodpointer
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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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cclasses,globtype,
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aasmtai,cpubase,cgbase,
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symconst,symtype,symsym,symdef,
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parabase,paramgr;
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type
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ti386paramanager = class(tparamanager)
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function ret_in_param(def : tdef;calloption : tproccalloption) : boolean;override;
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function push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;override;
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function get_para_align(calloption : tproccalloption):byte;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 get_volatile_registers_mm(calloption : tproccalloption):tcpuregisterset;override;
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{ Returns the location for the nr-st 32 Bit int parameter
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if every parameter before is an 32 Bit int parameter as well
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and if the calling conventions for the helper routines of the
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rtl are used.
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}
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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 createtempparaloc(list: taasmoutput;calloption : tproccalloption;parasym : tparavarsym;var cgpara:TCGPara);override;
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private
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procedure create_funcretloc_info(p : tabstractprocdef; side: tcallercallee);
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procedure create_stdcall_paraloc_info(p : tabstractprocdef; side: tcallercallee;paras:tparalist;var parasize:longint);
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procedure create_register_paraloc_info(p : tabstractprocdef; side: tcallercallee;paras:tparalist;var parareg,parasize:longint);
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end;
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implementation
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uses
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cutils,
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systems,verbose,
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defutil,
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cgutils;
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const
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parasupregs : array[0..2] of tsuperregister = (RS_EAX,RS_EDX,RS_ECX);
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{****************************************************************************
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TI386PARAMANAGER
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****************************************************************************}
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function ti386paramanager.ret_in_param(def : tdef;calloption : tproccalloption) : boolean;
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begin
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case target_info.system of
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system_i386_win32 :
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begin
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case def.deftype of
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recorddef :
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begin
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{ Win32 GCC returns small records in the FUNCTION_RETURN_REG.
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For stdcall we follow delphi instead of GCC }
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if (calloption in [pocall_cdecl,pocall_cppdecl]) and
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(def.size<=8) then
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begin
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result:=false;
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exit;
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end;
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end;
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end;
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end;
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end;
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result:=inherited ret_in_param(def,calloption);
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end;
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function ti386paramanager.push_addr_param(varspez:tvarspez;def : tdef;calloption : tproccalloption) : boolean;
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begin
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case target_info.system of
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system_i386_win32 :
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begin
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case def.deftype of
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recorddef :
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begin
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{ Win32 passes small records on the stack for call by
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value }
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if (calloption in [pocall_stdcall,pocall_cdecl,pocall_cppdecl]) and
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(varspez=vs_value) and
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(def.size<=8) then
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begin
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result:=false;
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exit;
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end;
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end;
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arraydef :
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begin
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{ Win32 passes arrays on the stack for call by
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value }
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if (calloption in [pocall_stdcall,pocall_cdecl,pocall_cppdecl]) and
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(varspez=vs_value) and
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(tarraydef(def).highrange>=tarraydef(def).lowrange) 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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end;
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end;
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end;
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end;
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result:=inherited push_addr_param(varspez,def,calloption);
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end;
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function ti386paramanager.get_para_align(calloption : tproccalloption):byte;
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begin
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if calloption=pocall_oldfpccall then
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begin
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if target_info.system in [system_i386_go32v2,system_i386_watcom] then
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result:=2
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else
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result:=4;
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end
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else
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result:=std_param_align;
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end;
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function ti386paramanager.get_volatile_registers_int(calloption : tproccalloption):tcpuregisterset;
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begin
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case calloption of
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pocall_internproc :
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result:=[];
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pocall_compilerproc :
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begin
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if pocall_default=pocall_oldfpccall then
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result:=[RS_EAX,RS_EDX,RS_ECX,RS_ESI,RS_EDI,RS_EBX]
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else
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result:=[RS_EAX,RS_EDX,RS_ECX];
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end;
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pocall_inline,
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pocall_register,
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pocall_safecall,
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pocall_stdcall,
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pocall_cdecl,
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pocall_cppdecl :
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result:=[RS_EAX,RS_EDX,RS_ECX];
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pocall_far16,
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pocall_pascal,
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pocall_oldfpccall :
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result:=[RS_EAX,RS_EDX,RS_ECX,RS_ESI,RS_EDI,RS_EBX];
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else
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internalerror(200309071);
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end;
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end;
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function ti386paramanager.get_volatile_registers_fpu(calloption : tproccalloption):tcpuregisterset;
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begin
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result:=[0..first_fpu_imreg-1];
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end;
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function ti386paramanager.get_volatile_registers_mm(calloption : tproccalloption):tcpuregisterset;
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begin
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result:=[0..first_mm_imreg-1];
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end;
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procedure ti386paramanager.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.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 calloption=pocall_register then
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begin
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if (nr<=high(parasupregs)+1) 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,parasupregs[nr-1],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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reference.index:=NR_STACK_POINTER_REG;
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reference.offset:=sizeof(aint)*nr;
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end;
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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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reference.index:=NR_STACK_POINTER_REG;
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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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procedure ti386paramanager.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.rettype.def);
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location_reset(p.funcretloc[side],LOC_INVALID,OS_NO);
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{ void has no location }
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if is_void(p.rettype.def) then
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begin
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location_reset(p.funcretloc[side],LOC_VOID,OS_NO);
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exit;
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end;
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{ Return in FPU register? }
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if p.rettype.def.deftype=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.rettype.def,p.proccalloption) then
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begin
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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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p.funcretloc[side].size:=OS_64;
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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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{ high 32bits }
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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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end
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else
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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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procedure ti386paramanager.create_stdcall_paraloc_info(p : tabstractprocdef; side: tcallercallee;paras:tparalist;var parasize:longint);
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var
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i : integer;
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hp : tparavarsym;
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paraloc : pcgparalocation;
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l,
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varalign,
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paraalign : longint;
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paracgsize : tcgsize;
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begin
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paraalign:=get_para_align(p.proccalloption);
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{ we push Flags and CS as long
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to cope with the IRETD
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and we save 6 register + 4 selectors }
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if po_interrupt in p.procoptions then
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inc(parasize,8+6*4+4*2);
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{ Offset is calculated like:
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sub esp,12
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mov [esp+8],para3
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mov [esp+4],para2
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mov [esp],para1
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call function
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That means for pushes the para with the
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highest offset (see para3) needs to be pushed first
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}
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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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if push_addr_param(hp.varspez,hp.vartype.def,p.proccalloption) then
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paracgsize:=OS_ADDR
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else
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begin
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paracgsize:=def_cgSize(hp.vartype.def);
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if paracgsize=OS_NO then
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paracgsize:=OS_ADDR;
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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].Alignment:=paraalign;
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paraloc:=hp.paraloc[side].add_location;
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paraloc^.loc:=LOC_REFERENCE;
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paraloc^.size:=paracgsize;
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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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l:=push_size(hp.varspez,hp.vartype.def,p.proccalloption);
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varalign:=used_align(size_2_align(l),paraalign,paraalign);
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paraloc^.reference.offset:=parasize;
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parasize:=align(parasize+l,varalign);
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end;
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{ Adapt offsets for left-to-right calling }
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if p.proccalloption in pushleftright_pocalls then
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begin
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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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l:=push_size(hp.varspez,hp.vartype.def,p.proccalloption);
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varalign:=used_align(size_2_align(l),paraalign,paraalign);
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l:=align(l,varalign);
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with hp.paraloc[side].location^ do
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begin
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reference.offset:=parasize-reference.offset-l;
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if side=calleeside then
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inc(reference.offset,target_info.first_parm_offset);
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end;
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end;
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end
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else
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begin
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{ Only need to adapt the callee side to include the
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standard stackframe size }
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if side=calleeside then
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begin
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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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inc(hp.paraloc[side].location^.reference.offset,target_info.first_parm_offset);
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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 ti386paramanager.create_register_paraloc_info(p : tabstractprocdef; side: tcallercallee;paras:tparalist;
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var parareg,parasize:longint);
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var
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hp : tparavarsym;
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paraloc : pcgparalocation;
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pushaddr,
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is_64bit : boolean;
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paracgsize : tcgsize;
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i : integer;
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l,
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varalign,
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paraalign : longint;
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begin
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paraalign:=get_para_align(p.proccalloption);
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{ Register parameters are assigned from left to right }
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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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pushaddr:=push_addr_param(hp.varspez,hp.vartype.def,p.proccalloption);
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if pushaddr then
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paracgsize:=OS_ADDR
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else
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paracgsize:=def_cgsize(hp.vartype.def);
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is_64bit:=(paracgsize in [OS_64,OS_S64,OS_F64]);
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hp.paraloc[side].reset;
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hp.paraloc[side].size:=paracgsize;
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hp.paraloc[side].Alignment:=paraalign;
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{
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EAX
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EDX
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ECX
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Stack
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Stack
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64bit values,floats,arrays and records are always
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on the stack.
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}
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paraloc:=hp.paraloc[side].add_location;
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paraloc^.size:=paracgsize;
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if (parareg<=high(parasupregs)) and
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not(
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is_64bit or
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((hp.vartype.def.deftype in [floatdef,recorddef,arraydef]) and
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(not pushaddr))
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) then
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begin
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paraloc^.loc:=LOC_REGISTER;
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paraloc^.register:=newreg(R_INTREGISTER,parasupregs[parareg],cgsize2subreg(paracgsize));
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inc(parareg);
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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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l:=push_size(hp.varspez,hp.vartype.def,p.proccalloption);
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varalign:=size_2_align(l);
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paraloc^.reference.offset:=parasize;
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varalign:=used_align(varalign,paraalign,paraalign);
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parasize:=align(parasize+l,varalign);
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end;
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end;
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{ Register parameters are assigned from left-to-right, adapt offset
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for calleeside to be reversed }
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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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with hp.paraloc[side].location^ do
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begin
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if (loc=LOC_REFERENCE) then
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begin
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l:=push_size(hp.varspez,hp.vartype.def,p.proccalloption);
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varalign:=used_align(size_2_align(l),paraalign,paraalign);
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l:=align(l,varalign);
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reference.offset:=parasize-reference.offset-l;
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if side=calleeside then
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inc(reference.offset,target_info.first_parm_offset);
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end;
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end;
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end;
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end;
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function ti386paramanager.create_paraloc_info(p : tabstractprocdef; side: tcallercallee):longint;
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var
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parasize,
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parareg : longint;
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begin
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parasize:=0;
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parareg:=0;
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case p.proccalloption of
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pocall_register :
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create_register_paraloc_info(p,side,p.paras,parareg,parasize);
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pocall_inline,
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pocall_compilerproc,
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pocall_internproc :
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begin
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{ Use default calling }
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if (pocall_default=pocall_register) then
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create_register_paraloc_info(p,side,p.paras,parareg,parasize)
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else
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create_stdcall_paraloc_info(p,side,p.paras,parasize);
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end;
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else
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create_stdcall_paraloc_info(p,side,p.paras,parasize);
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end;
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create_funcretloc_info(p,side);
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result:=parasize;
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end;
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function ti386paramanager.create_varargs_paraloc_info(p : tabstractprocdef; varargspara:tvarargsparalist):longint;
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var
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parasize : longint;
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begin
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parasize:=0;
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{ calculate the registers for the normal parameters }
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create_stdcall_paraloc_info(p,callerside,p.paras,parasize);
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{ append the varargs }
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create_stdcall_paraloc_info(p,callerside,varargspara,parasize);
|
|
result:=parasize;
|
|
end;
|
|
|
|
|
|
procedure ti386paramanager.createtempparaloc(list: taasmoutput;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:=ti386paramanager.create;
|
|
end.
|
|
{
|
|
$Log$
|
|
Revision 1.60 2004-11-22 22:01:19 peter
|
|
* fixed varargs
|
|
* replaced dynarray with tlist
|
|
|
|
Revision 1.59 2004/11/21 17:54:59 peter
|
|
* ttempcreatenode.create_reg merged into .create with parameter
|
|
whether a register is allowed
|
|
* funcret_paraloc renamed to funcretloc
|
|
|
|
Revision 1.58 2004/11/21 17:17:04 florian
|
|
* changed funcret location back to tlocation
|
|
|
|
Revision 1.57 2004/11/15 23:35:31 peter
|
|
* tparaitem removed, use tparavarsym instead
|
|
* parameter order is now calculated from paranr value in tparavarsym
|
|
|
|
Revision 1.56 2004/10/31 21:45:03 peter
|
|
* generic tlocation
|
|
* move tlocation to cgutils
|
|
|
|
Revision 1.55 2004/09/21 17:25:12 peter
|
|
* paraloc branch merged
|
|
|
|
Revision 1.54.4.1 2004/08/31 20:43:06 peter
|
|
* paraloc patch
|
|
|
|
Revision 1.54 2004/07/09 23:30:13 jonas
|
|
* changed first_sse_imreg to first_mm_imreg
|
|
|
|
Revision 1.53 2004/07/09 23:09:02 peter
|
|
* varargs calculation fixed, it's now the same as the other
|
|
targets
|
|
|
|
Revision 1.52 2004/06/20 08:55:31 florian
|
|
* logs truncated
|
|
|
|
Revision 1.51 2004/06/16 20:07:10 florian
|
|
* dwarf branch merged
|
|
|
|
Revision 1.50.2.3 2004/05/02 21:37:35 florian
|
|
* setting of func. ret. for i386 fixed
|
|
|
|
Revision 1.50.2.2 2004/05/02 12:45:32 peter
|
|
* enabled cpuhasfixedstack for x86-64 again
|
|
* fixed size of temp allocation for parameters
|
|
|
|
Revision 1.50.2.1 2004/05/01 16:02:10 peter
|
|
* POINTER_SIZE replaced with sizeof(aint)
|
|
* aint,aword,tconst*int moved to globtype
|
|
|
|
Revision 1.50 2004/02/09 22:14:17 peter
|
|
* more x86_64 parameter fixes
|
|
* tparalocation.lochigh is now used to indicate if register64.reghi
|
|
is used and what the type is
|
|
|
|
}
|