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https://gitlab.com/freepascal.org/fpc/source.git
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215 lines
8.1 KiB
ObjectPascal
215 lines
8.1 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Florian Klaempfl
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Generate i8086 inline nodes
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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 n8086inl;
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{$i fpcdefs.inc}
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interface
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uses
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nx86inl,node;
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type
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{ ti8086inlinenode }
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ti8086inlinenode = class(tx86inlinenode)
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function typecheck_seg: tnode; override;
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function first_seg: tnode; override;
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procedure second_seg; override;
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procedure second_get_frame;override;
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procedure second_incdec;override;
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end;
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implementation
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uses
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ninl,
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systems,
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globtype,globals,
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cutils,verbose,
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constexp,
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symconst,
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defutil,
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aasmbase,aasmtai,aasmdata,aasmcpu,
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symtype,symdef,symcpu,
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cgbase,pass_2,
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cpuinfo,cpubase,paramgr,
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nbas,ncon,ncal,ncnv,nld,ncgutil,
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tgobj,
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cga,cgutils,cgx86,cgobj,hlcgobj,
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htypechk,procinfo;
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function ti8086inlinenode.typecheck_seg: tnode;
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begin
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result := nil;
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resultdef:=u16inttype;
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{ don't allow constants }
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if is_constnode(left) then
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begin
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CGMessagePos(left.fileinfo,type_e_no_addr_of_constant);
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exit;
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end;
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end;
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function ti8086inlinenode.first_seg: tnode;
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begin
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expectloc:=LOC_REGISTER;
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result:=nil;
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end;
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procedure ti8086inlinenode.second_seg;
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var
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segref: treference;
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begin
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secondpass(left);
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if not(left.location.loc in [LOC_REFERENCE,LOC_CREFERENCE]) then
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internalerror(2013040101);
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{ if a segment register is specified in ref, we use that }
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if left.location.reference.segment<>NR_NO then
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begin
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location_reset(location,LOC_REGISTER,OS_16);
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if is_segment_reg(left.location.reference.segment) then
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begin
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location.register:=cg.getintregister(current_asmdata.CurrAsmList,OS_16);
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current_asmdata.CurrAsmList.Concat(Taicpu.op_reg_reg(A_MOV,S_W,left.location.reference.segment,location.register));
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end
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else
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location.register:=left.location.reference.segment;
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end
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{ references relative to a symbol use the segment of the symbol,
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which can be obtained by the SEG directive }
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else if assigned(left.location.reference.symbol) then
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begin
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location_reset(location,LOC_REGISTER,OS_16);
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location.register:=cg.getintregister(current_asmdata.CurrAsmList,OS_16);
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reference_reset_symbol(segref,left.location.reference.symbol,0,0);
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segref.refaddr:=addr_seg;
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cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_16,OS_16,segref,location.register);
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end
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else if left.location.reference.base=NR_BP then
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begin
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location_reset(location,LOC_REGISTER,OS_16);
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location.register:=cg.getintregister(current_asmdata.CurrAsmList,OS_16);
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current_asmdata.CurrAsmList.concat(Taicpu.op_reg_reg(A_MOV,S_W,NR_SS,location.register));
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end
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else
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begin
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location_reset(location,LOC_REGISTER,OS_16);
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location.register:=cg.getintregister(current_asmdata.CurrAsmList,OS_16);
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current_asmdata.CurrAsmList.Concat(Taicpu.op_reg_reg(A_MOV,S_W,NR_DS,location.register));
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end;
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end;
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procedure ti8086inlinenode.second_get_frame;
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begin
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if current_settings.x86memorymodel in x86_far_data_models then
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begin
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if current_procinfo.framepointer=NR_STACK_POINTER_REG then
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internalerror(2014030201);
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location_reset(location,LOC_REGISTER,OS_32);
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location.register:=cg.getintregister(current_asmdata.CurrAsmList,OS_32);
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emit_reg_reg(A_MOV,S_W,current_procinfo.framepointer,location.register);
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current_asmdata.CurrAsmList.Concat(Taicpu.op_reg_reg(A_MOV,S_W,NR_SS,GetNextReg(location.register)));
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end
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else
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inherited second_get_frame;
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end;
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procedure ti8086inlinenode.second_incdec;
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const
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addsubop:array[in_inc_x..in_dec_x] of TOpCG=(OP_ADD,OP_SUB);
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var
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addvalue : TConstExprInt;
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addconstant : boolean;
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hregister : tregister;
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tmploc: tlocation;
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begin
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if is_farpointer(tcallparanode(left).left.resultdef) then
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begin
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{ set defaults }
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addconstant:=true;
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hregister:=NR_NO;
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{ first secondpass second argument, because if the first arg }
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{ is used in that expression then SSL may move it to another }
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{ register }
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if assigned(tcallparanode(left).right) then
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secondpass(tcallparanode(tcallparanode(left).right).left);
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{ load first parameter, must be a reference }
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secondpass(tcallparanode(left).left);
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tmploc:=tcallparanode(left).left.location;
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tmploc.size:=OS_S16;
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{ get addvalue }
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case tcallparanode(left).left.resultdef.typ of
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pointerdef :
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begin
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if is_void(tpointerdef(tcallparanode(left).left.resultdef).pointeddef) then
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addvalue:=1
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else
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addvalue:=tpointerdef(tcallparanode(left).left.resultdef).pointeddef.size;
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end;
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else
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internalerror(10081);
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end;
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{ second_ argument specified?, must be a s16bit in register }
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if assigned(tcallparanode(left).right) then
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begin
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{ when constant, just multiply the addvalue }
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if is_constintnode(tcallparanode(tcallparanode(left).right).left) then
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addvalue:=addvalue*get_ordinal_value(tcallparanode(tcallparanode(left).right).left)
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else if is_constpointernode(tcallparanode(tcallparanode(left).right).left) then
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addvalue:=addvalue*tpointerconstnode(tcallparanode(tcallparanode(left).right).left).value
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else
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begin
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hlcg.location_force_reg(current_asmdata.CurrAsmList,tcallparanode(tcallparanode(left).right).left.location,tcallparanode(tcallparanode(left).right).left.resultdef,s16inttype,addvalue<=1);
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hregister:=tcallparanode(tcallparanode(left).right).left.location.register;
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{ insert multiply with addvalue if its >1 }
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if addvalue>1 then
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hlcg.a_op_const_reg(current_asmdata.CurrAsmList,OP_IMUL,s16inttype,addvalue.svalue,hregister);
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addconstant:=false;
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end;
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end;
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{ write the add instruction }
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if addconstant then
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begin
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hlcg.a_op_const_loc(current_asmdata.CurrAsmList,addsubop[inlinenumber],s16inttype,
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smallint(addvalue.svalue),
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tmploc);
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end
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else
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begin
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hlcg.a_op_reg_loc(current_asmdata.CurrAsmList,addsubop[inlinenumber],s16inttype,
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hregister,tmploc);
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end;
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end
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else
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inherited second_incdec;
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end;
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begin
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cinlinenode:=ti8086inlinenode;
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end.
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