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{
Copyright (c) 1998-2010 by Florian Klaempfl and Jonas Maebe
Member of the Free Pascal development team
This unit contains routines to create a pass-through high-level code
generator. This is used by most regular code generators.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit hlcgcpu;
{$i fpcdefs.inc}
interface
uses
globtype,
aasmbase, aasmdata,
cgbase, cgutils,
symconst,symtype,symdef,
hlcg2ll;
type
thlcgcpu = class(thlcg2ll)
procedure a_bit_set_reg_reg(list: TAsmList; doset: boolean; bitnumbersize, destsize: tdef; bitnumber, dest: tregister); override;
procedure a_bit_set_const_reg(list: TAsmList; doset: boolean; destsize: tdef; bitnumber: tcgint; destreg: tregister); override;
procedure a_bit_set_reg_ref(list: TAsmList; doset: boolean; fromsize, tosize: tdef; bitnumber: tregister; const ref: treference); override;
procedure a_bit_set_const_ref(list: TAsmList; doset: boolean; destsize: tdef; bitnumber: tcgint; const ref: treference); override;
procedure g_intf_wrapper(list: TAsmList; procdef: tprocdef; const labelname: string; ioffset: longint);override;
procedure gen_load_loc_function_result(list: TAsmList; vardef: tdef; const l: tlocation);override;
end;
implementation
uses
globals, verbose, systems, cutils,
fmodule,
aasmtai, aasmcpu,
defutil,
hlcgobj,
cpuinfo, cgobj, cpubase, cgcpu,
parabase, procinfo;
const
bit_set_clr_instr: array[boolean] of tasmop = (A_BCLR,A_BSET);
procedure thlcgcpu.a_bit_set_reg_reg(list: TAsmList; doset: boolean; bitnumbersize, destsize: tdef; bitnumber, dest: tregister);
var
tmpvalue: tregister;
begin
tmpvalue:=getintregister(list,ptruinttype);
//list.concat(tai_comment.create(strpnew('a_bit_set_reg_reg: called!')));
a_load_const_reg(list,ptruinttype,destsize.size*8-1,tmpvalue);
a_op_reg_reg(list,OP_SUB,bitnumbersize,bitnumber,tmpvalue);
list.concat(taicpu.op_reg_reg(bit_set_clr_instr[doset],S_NO,tmpvalue,dest));
end;
procedure thlcgcpu.a_bit_set_const_reg(list: TAsmList; doset: boolean; destsize: tdef; bitnumber: tcgint; destreg: tregister);
begin
//list.concat(tai_comment.create(strpnew('a_bit_set_const_reg: called!')));
list.concat(taicpu.op_const_reg(bit_set_clr_instr[doset],S_NO,(destsize.size*8)-bitnumber-1,destreg));
end;
procedure thlcgcpu.a_bit_set_reg_ref(list: TAsmList; doset: boolean; fromsize, tosize: tdef; bitnumber: tregister; const ref: treference);
var
tmpvalue: tregister;
sref: tsubsetreference;
begin
//list.concat(tai_comment.create(strpnew('a_bit_set_reg_ref: called!')));
sref:=get_bit_reg_ref_sref(list,fromsize,tosize,bitnumber,ref);
tcg68k(cg).fixref(list,sref.ref,false);
tmpvalue:=getintregister(list,ptruinttype);
a_load_const_reg(list,ptruinttype,7,tmpvalue);
a_op_reg_reg(list,OP_SUB,fromsize,sref.bitindexreg,tmpvalue);
{ memory accesses of bset/bclr are always byte, so no alignment problem }
list.concat(taicpu.op_reg_ref(bit_set_clr_instr[doset],S_NO,tmpvalue,sref.ref));
end;
procedure thlcgcpu.a_bit_set_const_ref(list: TAsmList; doset: boolean; destsize: tdef; bitnumber: tcgint; const ref: treference);
var
sref: tsubsetreference;
begin
//list.concat(tai_comment.create(strpnew('a_bit_set_const_ref: called!')));
sref:=get_bit_const_ref_sref(bitnumber,destsize,ref);
tcg68k(cg).fixref(list,sref.ref,current_settings.cputype in cpu_coldfire);
{ memory accesses of bset/bclr are always byte, so no alignment problem }
list.concat(taicpu.op_const_ref(bit_set_clr_instr[doset],S_NO,8-sref.startbit-1,sref.ref));
end;
procedure thlcgcpu.g_intf_wrapper(list: TAsmList; procdef: tprocdef; const labelname: string; ioffset: longint);
procedure putselfa0tostack(offs: longint);
var
href: treference;
begin
{ move a0 which is self out of the way to the stack }
reference_reset_base(href,voidpointertype,NR_STACK_POINTER_REG,offs,ctempposinvalid,4,[]);
list.concat(taicpu.op_reg_ref(A_MOVE,S_L,NR_A0,href));
end;
procedure getselftoa0(offs:longint);
var
href : treference;
selfoffsetfromsp : longint;
begin
{ move.l offset(%sp),%a0 }
{ framepointer is pushed for nested procs }
if procdef.parast.symtablelevel>normal_function_level then
selfoffsetfromsp:=sizeof(aint)
else
selfoffsetfromsp:=0;
reference_reset_base(href, voidstackpointertype, NR_SP,selfoffsetfromsp+offs,ctempposinvalid,4,[]);
cg.a_load_ref_reg(list,OS_ADDR,OS_ADDR,href,NR_A0);
end;
procedure loadvmttoa0;
var
href : treference;
begin
{ move.l (%a0),%a0 ; load vmt}
reference_reset_base(href, voidpointertype, NR_A0,0,ctempposinvalid,4,[]);
cg.a_load_ref_reg(list,OS_ADDR,OS_ADDR,href,NR_A0);
end;
procedure op_onmethodaddrviastack(offs: longint);
var
href : treference;
href2 : treference;
begin
if (procdef.extnumber=$ffff) then
internalerror(2017061401);
reference_reset_base(href,voidpointertype,NR_A0,tobjectdef(procdef.struct).vmtmethodoffset(procdef.extnumber),ctempposinvalid,4,[]);
{ handle-too-large-for-68k offsets }
{ I'm not even sure this is handled elsewhere in the compiler for VMTs, but lets play safe... (KB) }
if href.offset >= high(smallint) then
begin
list.concat(taicpu.op_const_reg(A_ADD,S_L,href.offset,NR_A0));
href.offset:=0;
end;
{ push the method address to the stack }
reference_reset_base(href2,voidpointertype,NR_STACK_POINTER_REG,0,ctempposinvalid,4,[]);
href2.direction:=dir_dec;
list.concat(taicpu.op_ref_ref(A_MOVE,S_L,href,href2));
{ restore A0 from the stack }
reference_reset_base(href2,voidpointertype,NR_STACK_POINTER_REG,offs+4,ctempposinvalid,4,[]); { offs+4, because we used dir_dec above }
list.concat(taicpu.op_ref_reg(A_MOVE,S_L,href2,NR_A0));
{ pop the method address from the stack, and jump to it }
list.concat(taicpu.op_none(A_RTS,S_NO));
end;
procedure op_ona0methodaddr;
var
href : treference;
begin
if (procdef.extnumber=$ffff) then
Internalerror(2013100701);
reference_reset_base(href,voidpointertype,NR_A0,tobjectdef(procdef.struct).vmtmethodoffset(procdef.extnumber),ctempposinvalid,4,[]);
list.concat(taicpu.op_ref_reg(A_MOVE,S_L,href,NR_A0));
reference_reset_base(href,voidpointertype,NR_A0,0,ctempposinvalid,4,[]);
list.concat(taicpu.op_ref(A_JMP,S_NO,href));
end;
var
make_global : boolean;
begin
if not(procdef.proctypeoption in [potype_function,potype_procedure]) then
Internalerror(200006137);
if not assigned(procdef.struct) or
(procdef.procoptions*[po_classmethod, po_staticmethod,
po_methodpointer, po_interrupt, po_iocheck]<>[]) then
Internalerror(200006138);
if procdef.owner.symtabletype<>ObjectSymtable then
Internalerror(200109191);
make_global:=false;
if (not current_module.is_unit) or
create_smartlink or
(procdef.owner.defowner.owner.symtabletype=globalsymtable) then
make_global:=true;
if make_global then
List.concat(Tai_symbol.Createname_global(labelname,AT_FUNCTION,0,procdef))
else
List.concat(Tai_symbol.Createname_hidden(labelname,AT_FUNCTION,0,procdef));
{ set param1 interface to self }
g_adjust_self_value(list,procdef,ioffset);
{ case 4 }
if (po_virtualmethod in procdef.procoptions) and
not is_objectpascal_helper(procdef.struct) then
begin
if (procdef.proccalloption in [pocall_register]) then
begin
putselfa0tostack(-8);
loadvmttoa0;
op_onmethodaddrviastack(-8);
end
else
begin
getselftoa0(4);
loadvmttoa0;
op_ona0methodaddr;
end;
end
{ case 0 }
else
list.concat(taicpu.op_sym(A_JMP,S_NO,current_asmdata.RefAsmSymbol(procdef.mangledname,AT_FUNCTION)));
List.concat(Tai_symbol_end.Createname(labelname));
end;
procedure thlcgcpu.gen_load_loc_function_result(list: TAsmList; vardef: tdef; const l: tlocation);
var
cgpara: tcgpara;
begin
inherited;
{ Kludge:
GCC (and SVR4 in general maybe?) requires a pointer
result on the A0 register, as well as D0. So when we
have a result in A0, also copy it to D0. See the decision
making code in tcpuparamanager.get_funcretloc (KB) }
cgpara:=current_procinfo.procdef.funcretloc[calleeside];
if ((cgpara.location^.loc = LOC_REGISTER) and
(isaddressregister(cgpara.location^.register))) then
begin
cg.a_load_reg_reg(list,OS_ADDR,OS_ADDR,NR_RETURN_ADDRESS_REG,NR_FUNCTION_RESULT_REG);
end;
end;
procedure create_hlcodegen_cpu;
begin
hlcg:=thlcgcpu.create;
create_codegen;
end;
begin
chlcgobj:=thlcgcpu;
create_hlcodegen:=@create_hlcodegen_cpu;
end.
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