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687 lines
27 KiB
ObjectPascal
687 lines
27 KiB
ObjectPascal
{
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Copyright (c) 2000-2002 by Florian Klaempfl
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This unit implements some basic 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 ncgbas;
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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,cgutils,
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node,nbas;
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type
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tcgnothingnode = class(tnothingnode)
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procedure pass_generate_code;override;
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end;
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tcgasmnode = class(tasmnode)
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protected
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procedure ResolveRef(const filepos: tfileposinfo; var op:toper); virtual;
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public
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procedure pass_generate_code;override;
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end;
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tcgstatementnode = class(tstatementnode)
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procedure pass_generate_code;override;
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end;
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tcgblocknode = class(tblocknode)
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procedure pass_generate_code;override;
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end;
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tcgtempcreatenode = class(ttempcreatenode)
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procedure pass_generate_code;override;
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end;
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tcgtemprefnode = class(ttemprefnode)
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procedure pass_generate_code;override;
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{ Changes the location of this temp to ref. Useful when assigning }
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{ another temp to this one. The current location will be freed. }
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{ Can only be called in pass 2 (since earlier, the temp location }
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{ isn't known yet) }
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procedure changelocation(const ref: treference);
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end;
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tcgtempdeletenode = class(ttempdeletenode)
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procedure pass_generate_code;override;
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end;
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implementation
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uses
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globals,
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cutils,verbose,
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aasmbase,aasmcpu,
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symsym,symconst,defutil,
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pass_2,ncgutil,
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cgbase,cgobj,hlcgobj,
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procinfo,
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cpuinfo,
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tgobj
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;
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{*****************************************************************************
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TNOTHING
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*****************************************************************************}
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procedure tcgnothingnode.pass_generate_code;
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begin
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location_reset(location,LOC_VOID,OS_NO);
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{ avoid an abstract rte }
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end;
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{*****************************************************************************
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TSTATEMENTNODE
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*****************************************************************************}
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procedure tcgstatementnode.pass_generate_code;
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var
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hp : tstatementnode;
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begin
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location_reset(location,LOC_VOID,OS_NO);
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hp:=self;
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while assigned(hp) do
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begin
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if assigned(hp.left) then
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begin
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secondpass(hp.left);
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{ Compiler inserted blocks can return values }
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location_copy(hp.location,hp.left.location);
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end;
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hp:=tstatementnode(hp.right);
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end;
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end;
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{*****************************************************************************
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TASMNODE
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*****************************************************************************}
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procedure tcgasmnode.ResolveRef(const filepos: tfileposinfo; var op:toper);
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var
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sym : tabstractnormalvarsym;
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{$ifdef x86}
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scale : byte;
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{$endif x86}
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forceref,
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getoffset : boolean;
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indexreg : tregister;
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sofs : longint;
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begin
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if (op.typ=top_local) then
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begin
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sofs:=op.localoper^.localsymofs;
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indexreg:=op.localoper^.localindexreg;
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{$ifdef x86}
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scale:=op.localoper^.localscale;
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{$endif x86}
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getoffset:=op.localoper^.localgetoffset;
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forceref:=op.localoper^.localforceref;
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sym:=tabstractnormalvarsym(pointer(op.localoper^.localsym));
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dispose(op.localoper);
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case sym.localloc.loc of
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LOC_REFERENCE :
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begin
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if getoffset then
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begin
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if indexreg=NR_NO then
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begin
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op.typ:=top_const;
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op.val:=sym.localloc.reference.offset+sofs;
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end
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else
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begin
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op.typ:=top_ref;
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new(op.ref);
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reference_reset_base(op.ref^,indexreg,sym.localloc.reference.offset+sofs,
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newalignment(sym.localloc.reference.alignment,sofs),[]);
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end;
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end
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else
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begin
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op.typ:=top_ref;
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new(op.ref);
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reference_reset_base(op.ref^,sym.localloc.reference.base,sym.localloc.reference.offset+sofs,
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newalignment(sym.localloc.reference.alignment,sofs),[]);
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op.ref^.index:=indexreg;
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{$ifdef x86}
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op.ref^.scalefactor:=scale;
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{$endif x86}
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end;
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end;
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LOC_REGISTER :
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begin
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if getoffset then
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MessagePos(filepos,asmr_e_invalid_reference_syntax);
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{ Subscribed access }
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if forceref or
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(sofs<>0) then
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begin
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op.typ:=top_ref;
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new(op.ref);
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{ no idea about the actual alignment }
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reference_reset_base(op.ref^,sym.localloc.register,sofs,1,[]);
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op.ref^.index:=indexreg;
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{$ifdef x86}
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op.ref^.scalefactor:=scale;
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{$endif x86}
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end
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else
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begin
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op.typ:=top_reg;
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op.reg:=sym.localloc.register;
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end;
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end;
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LOC_FPUREGISTER,
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LOC_MMXREGISTER,
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LOC_MMREGISTER :
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begin
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op.typ:=top_reg;
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op.reg:=NR_NO;
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if getoffset then
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MessagePos(filepos,asmr_e_invalid_reference_syntax);
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{ Using an MM/FPU register in a reference is not possible }
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if forceref or (sofs<>0) then
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MessagePos1(filepos,asmr_e_invalid_ref_register,std_regname(sym.localloc.register))
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else
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op.reg:=sym.localloc.register;
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end;
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LOC_INVALID :
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begin
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{ in "assembler; nostackframe;" routines, the
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funcret loc is set to LOC_INVALID in case the
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result is returned via a complex location
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(more than one register, ...) }
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if (vo_is_funcret in tabstractvarsym(sym).varoptions) then
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MessagePos(filepos,asmr_e_complex_function_result_location)
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else
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internalerror(2012082101);
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{ recover }
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op.typ:=top_reg;
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op.reg:=NR_FUNCTION_RETURN_REG;
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end;
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else
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internalerror(201001031);
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end;
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end;
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end;
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procedure tcgasmnode.pass_generate_code;
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procedure ReLabel(var p:tasmsymbol);
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begin
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{ Only relabel local tasmlabels }
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if (p.bind = AB_LOCAL) and
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(p is tasmlabel) then
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begin
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if not assigned(p.altsymbol) then
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current_asmdata.GenerateAltSymbol(p);
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p:=p.altsymbol;
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p.increfs;
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end;
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end;
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var
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hp,hp2 : tai;
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i : longint;
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begin
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location_reset(location,LOC_VOID,OS_NO);
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if (nf_get_asm_position in flags) then
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begin
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{ Add a marker, to be sure the list is not empty }
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current_asmdata.CurrAsmList.concat(tai_marker.create(mark_Position));
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currenttai:=tai(current_asmdata.CurrAsmList.last);
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exit;
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end;
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{ Switch to the CPU instruction set, specified by the $ASMCPU directive }
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current_asmdata.CurrAsmList.Concat(tai_directive.create(asd_cpu,cputypestr[current_settings.asmcputype]));
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{ Allocate registers used in the assembler block }
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{ has_registerlist=true means that registers are specified and already allocated }
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if (not has_registerlist) then
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cg.allocallcpuregisters(current_asmdata.CurrAsmList);
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if (po_inline in current_procinfo.procdef.procoptions) then
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begin
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hp:=tai(p_asm.first);
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while assigned(hp) do
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begin
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hp2:=tai(hp.getcopy);
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case hp2.typ of
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ait_label :
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ReLabel(tasmsymbol(tai_label(hp2).labsym));
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ait_const :
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begin
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if assigned(tai_const(hp2).sym) then
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ReLabel(tai_const(hp2).sym);
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if assigned(tai_const(hp2).endsym) then
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ReLabel(tai_const(hp2).endsym);
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end;
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ait_instruction :
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begin
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{ remove cached insentry, because the new code can
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require another less optimized instruction }
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{$ifdef i386}
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{$ifndef NOAG386BIN}
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taicpu(hp2).ResetPass1;
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{$endif}
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{$endif}
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{ fixup the references }
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for i:=1 to taicpu(hp2).ops do
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begin
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ResolveRef(taicpu(hp2).fileinfo,taicpu(hp2).oper[i-1]^);
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with taicpu(hp2).oper[i-1]^ do
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begin
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case typ of
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top_ref :
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begin
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if assigned(ref^.symbol) then
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ReLabel(ref^.symbol);
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if assigned(ref^.relsymbol) then
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ReLabel(ref^.relsymbol);
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end;
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end;
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end;
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end;
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{$ifdef x86}
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{ can only be checked now that all local operands }
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{ have been resolved }
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taicpu(hp2).CheckIfValid;
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{$endif x86}
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end;
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end;
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current_asmdata.CurrAsmList.concat(hp2);
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hp:=tai(hp.next);
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end;
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{ restore used symbols }
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current_asmdata.ResetAltSymbols;
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end
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else
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begin
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hp:=tai(p_asm.first);
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while assigned(hp) do
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begin
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case hp.typ of
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ait_instruction :
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begin
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{ remove cached insentry, because the new code can
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require another less optimized instruction }
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{$ifdef i386}
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{$ifndef NOAG386BIN}
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taicpu(hp).ResetPass1;
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{$endif}
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{$endif}
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{ fixup the references }
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for i:=1 to taicpu(hp).ops do
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ResolveRef(taicpu(hp).fileinfo,taicpu(hp).oper[i-1]^);
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{$ifdef x86}
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{ can only be checked now that all local operands }
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{ have been resolved }
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taicpu(hp).CheckIfValid;
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{$endif x86}
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end;
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end;
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hp:=tai(hp.next);
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end;
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{ insert the list }
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current_asmdata.CurrAsmList.concatlist(p_asm);
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end;
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{ Update section count }
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current_asmdata.currasmlist.section_count:=current_asmdata.currasmlist.section_count+p_asm.section_count;
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{ Release register used in the assembler block }
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if (not has_registerlist) then
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cg.deallocallcpuregisters(current_asmdata.CurrAsmList);
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{ Switch back to the CPU instruction set of the target CPU }
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current_asmdata.CurrAsmList.Concat(tai_directive.create(asd_cpu,cputypestr[current_settings.cputype]));
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end;
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{*****************************************************************************
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TBLOCKNODE
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*****************************************************************************}
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procedure tcgblocknode.pass_generate_code;
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var
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hp : tstatementnode;
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oldexitlabel : tasmlabel;
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oldflowcontrol : tflowcontrol;
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begin
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location_reset(location,LOC_VOID,OS_NO);
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oldflowcontrol:=[];
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oldexitlabel:=nil;
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{ replace exitlabel? }
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if nf_block_with_exit in flags then
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begin
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oldexitlabel:=current_procinfo.CurrExitLabel;
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current_asmdata.getjumplabel(current_procinfo.CurrExitLabel);
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oldflowcontrol:=flowcontrol;
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{ the nested block will not span an exit statement of the parent }
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exclude(flowcontrol,fc_exit);
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end;
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{ do second pass on left node }
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if assigned(left) then
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begin
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hp:=tstatementnode(left);
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while assigned(hp) do
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begin
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if assigned(hp.left) then
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begin
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secondpass(hp.left);
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location_copy(hp.location,hp.left.location);
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end;
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location_copy(location,hp.location);
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hp:=tstatementnode(hp.right);
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end;
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end;
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{ write exitlabel }
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if nf_block_with_exit in flags then
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begin
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cg.a_label(current_asmdata.CurrAsmList,current_procinfo.CurrExitLabel);
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current_procinfo.CurrExitLabel:=oldexitlabel;
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{ the exit statements inside this block are not exit statements }
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{ out of the parent }
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flowcontrol:=oldflowcontrol+(flowcontrol - [fc_exit]);
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end;
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end;
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{*****************************************************************************
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TTEMPCREATENODE
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*****************************************************************************}
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procedure tcgtempcreatenode.pass_generate_code;
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begin
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location_reset(location,LOC_VOID,OS_NO);
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{ if we're secondpassing the same tcgtempcreatenode twice, we have a bug }
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if (ti_valid in tempflags) then
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internalerror(200108222);
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{ in case of ti_reference, the location will be initialised using the
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location of the tempinitnode once the first temprefnode is processed }
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if not(ti_reference in tempflags) then
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begin
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{ get a (persistent) temp }
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if is_managed_type(tempinfo^.typedef) and
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not(ti_const in tempflags) then
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begin
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location_reset_ref(tempinfo^.location,LOC_REFERENCE,def_cgsize(tempinfo^.typedef),0,[]);
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tg.gethltempmanaged(current_asmdata.CurrAsmList,tempinfo^.typedef,tempinfo^.temptype,tempinfo^.location.reference);
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if not(ti_nofini in tempflags) then
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hlcg.g_finalize(current_asmdata.CurrAsmList,tempinfo^.typedef,tempinfo^.location.reference);
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end
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else if (ti_may_be_in_reg in tempflags) then
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begin
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location_allocate_register(current_asmdata.CurrAsmList,tempinfo^.location,tempinfo^.typedef,tempinfo^.temptype = tt_persistent);
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end
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else
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begin
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location_reset_ref(tempinfo^.location,LOC_REFERENCE,def_cgsize(tempinfo^.typedef),0,[]);
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tg.gethltemp(current_asmdata.CurrAsmList,tempinfo^.typedef,size,tempinfo^.temptype,tempinfo^.location.reference);
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end;
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end;
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includetempflag(ti_valid);
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if assigned(tempinfo^.tempinitcode) then
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includetempflag(ti_executeinitialisation);
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end;
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{*****************************************************************************
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TTEMPREFNODE
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*****************************************************************************}
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procedure tcgtemprefnode.pass_generate_code;
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begin
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if ti_executeinitialisation in tempflags then
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begin
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{ avoid recursion }
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excludetempflag(ti_executeinitialisation);
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secondpass(tempinfo^.tempinitcode);
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if (ti_reference in tempflags) then
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begin
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case tempinfo^.tempinitcode.location.loc of
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LOC_CREGISTER,
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LOC_CFPUREGISTER,
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LOC_CMMREGISTER,
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LOC_CSUBSETREG:
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begin
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{ although it's ok if we need this value multiple times
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for reading, it's not in case of writing (because the
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register could change due to SSA -> storing to the saved
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register afterwards would be wrong). }
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if not(ti_readonly in tempflags) then
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internalerror(2011031407);
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end;
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{ in case reference contains CREGISTERS, that doesn't matter:
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we want to write to the location indicated by the current
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value of those registers, and we can save those values }
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end;
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hlcg.g_reference_loc(current_asmdata.CurrAsmList,tempinfo^.typedef,tempinfo^.tempinitcode.location,tempinfo^.location);
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end;
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end;
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{ check if the temp is valid }
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if not(ti_valid in tempflags) then
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internalerror(200108231);
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location:=tempinfo^.location;
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case tempinfo^.location.loc of
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LOC_REFERENCE:
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begin
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{ ti_valid should be excluded if it's a normal temp }
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end;
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LOC_REGISTER,
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LOC_FPUREGISTER,
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LOC_MMREGISTER :
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excludetempflag(ti_valid);
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end;
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end;
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procedure tcgtemprefnode.changelocation(const ref: treference);
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begin
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{ check if the temp is valid }
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if not(ti_valid in tempflags) then
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internalerror(200306081);
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if (tempinfo^.location.loc<>LOC_REFERENCE) then
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internalerror(2004020203);
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if (tempinfo^.temptype = tt_persistent) then
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tg.ChangeTempType(current_asmdata.CurrAsmList,tempinfo^.location.reference,tt_normal);
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tg.ungettemp(current_asmdata.CurrAsmList,tempinfo^.location.reference);
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tempinfo^.location.reference := ref;
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tg.ChangeTempType(current_asmdata.CurrAsmList,tempinfo^.location.reference,tempinfo^.temptype);
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{ adapt location }
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location.reference := ref;
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end;
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{*****************************************************************************
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TTEMPDELETENODE
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*****************************************************************************}
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procedure tcgtempdeletenode.pass_generate_code;
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begin
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if ti_reference in tempflags then
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begin
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{ release_to_normal means that the temp will be freed the next
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time it's used. However, reference temps reference some other
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|
location that is not managed by this temp and hence cannot be
|
|
freed }
|
|
if release_to_normal then
|
|
internalerror(2011052205);
|
|
{ so we only mark this temp location as "no longer valid" when
|
|
it's deleted (ttempdeletenodes are also used during getcopy, so
|
|
we really do need one) }
|
|
excludetempflag(ti_valid);
|
|
exit;
|
|
end;
|
|
|
|
location_reset(location,LOC_VOID,OS_NO);
|
|
|
|
{ see comments at ti_const declaration: if we initialised this temp with
|
|
the value of another temp, that other temp was not freed because the
|
|
ti_const flag was set }
|
|
if (ti_const in tempflags) and
|
|
assigned(tempinfo^.tempinitcode) then
|
|
begin
|
|
if tempinfo^.tempinitcode.nodetype<>assignn then
|
|
internalerror(2016081201);
|
|
if tbinarynode(tempinfo^.tempinitcode).right.location.loc in [LOC_REFERENCE,LOC_CREFERENCE] then
|
|
tg.ungetiftemp(current_asmdata.CurrAsmList,tbinarynode(tempinfo^.tempinitcode).right.location.reference);
|
|
end;
|
|
|
|
|
|
case tempinfo^.location.loc of
|
|
LOC_REFERENCE:
|
|
begin
|
|
if release_to_normal then
|
|
tg.ChangeTempType(current_asmdata.CurrAsmList,tempinfo^.location.reference,tt_normal)
|
|
else
|
|
begin
|
|
tg.UnGetTemp(current_asmdata.CurrAsmList,tempinfo^.location.reference);
|
|
excludetempflag(ti_valid);
|
|
end;
|
|
end;
|
|
LOC_CREGISTER,
|
|
LOC_REGISTER:
|
|
begin
|
|
if (not(cs_opt_regvar in current_settings.optimizerswitches) or
|
|
(pi_has_label in current_procinfo.flags)) and not(ti_no_final_regsync in tempflags) then
|
|
begin
|
|
{ make sure the register allocator doesn't reuse the }
|
|
{ register e.g. in the middle of a loop }
|
|
{$if defined(cpu32bitalu)}
|
|
if tempinfo^.location.size in [OS_64,OS_S64] then
|
|
begin
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,tempinfo^.location.register64.reghi);
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,tempinfo^.location.register64.reglo);
|
|
end
|
|
else
|
|
{$elseif defined(cpu16bitalu)}
|
|
if tempinfo^.location.size in [OS_64,OS_S64] then
|
|
begin
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,tempinfo^.location.register64.reghi);
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,GetNextReg(tempinfo^.location.register64.reghi));
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,tempinfo^.location.register64.reglo);
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,GetNextReg(tempinfo^.location.register64.reglo));
|
|
end
|
|
else
|
|
if tempinfo^.location.size in [OS_32,OS_S32] then
|
|
begin
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,tempinfo^.location.register);
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,GetNextReg(tempinfo^.location.register));
|
|
end
|
|
else
|
|
{$elseif defined(cpu8bitalu)}
|
|
if tempinfo^.location.size in [OS_64,OS_S64] then
|
|
begin
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,tempinfo^.location.register64.reghi);
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,GetNextReg(tempinfo^.location.register64.reghi));
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,GetNextReg(GetNextReg(tempinfo^.location.register64.reghi)));
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,GetNextReg(GetNextReg(GetNextReg(tempinfo^.location.register64.reghi))));
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,tempinfo^.location.register64.reglo);
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,GetNextReg(tempinfo^.location.register64.reglo));
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,GetNextReg(GetNextReg(tempinfo^.location.register64.reglo)));
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,GetNextReg(GetNextReg(GetNextReg(tempinfo^.location.register64.reglo))));
|
|
end
|
|
else
|
|
if tempinfo^.location.size in [OS_32,OS_S32] then
|
|
begin
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,tempinfo^.location.register);
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,GetNextReg(tempinfo^.location.register));
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,GetNextReg(GetNextReg(tempinfo^.location.register)));
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,GetNextReg(GetNextReg(GetNextReg(tempinfo^.location.register))));
|
|
end
|
|
else
|
|
if tempinfo^.location.size in [OS_16,OS_S16] then
|
|
begin
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,tempinfo^.location.register);
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,GetNextReg(tempinfo^.location.register));
|
|
end
|
|
else
|
|
{$endif}
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,tempinfo^.location.register);
|
|
end;
|
|
if release_to_normal then
|
|
tempinfo^.location.loc := LOC_REGISTER
|
|
else
|
|
excludetempflag(ti_valid);
|
|
end;
|
|
LOC_CFPUREGISTER,
|
|
LOC_FPUREGISTER:
|
|
begin
|
|
if (not(cs_opt_regvar in current_settings.optimizerswitches) or
|
|
(pi_has_label in current_procinfo.flags)) and not(ti_no_final_regsync in tempflags) then
|
|
begin
|
|
{ make sure the register allocator doesn't reuse the }
|
|
{ register e.g. in the middle of a loop }
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,tempinfo^.location.register);
|
|
end;
|
|
if release_to_normal then
|
|
tempinfo^.location.loc := LOC_FPUREGISTER
|
|
else
|
|
excludetempflag(ti_valid);
|
|
end;
|
|
LOC_CMMREGISTER,
|
|
LOC_MMREGISTER:
|
|
begin
|
|
if (not(cs_opt_regvar in current_settings.optimizerswitches) or
|
|
(pi_has_label in current_procinfo.flags)) and not(ti_no_final_regsync in tempflags) then
|
|
begin
|
|
{ make sure the register allocator doesn't reuse the }
|
|
{ register e.g. in the middle of a loop }
|
|
cg.a_reg_sync(current_asmdata.CurrAsmList,tempinfo^.location.register);
|
|
end;
|
|
if release_to_normal then
|
|
tempinfo^.location.loc := LOC_MMREGISTER
|
|
else
|
|
excludetempflag(ti_valid);
|
|
end;
|
|
else
|
|
internalerror(200507161);
|
|
end;
|
|
end;
|
|
|
|
|
|
begin
|
|
cnothingnode:=tcgnothingnode;
|
|
casmnode:=tcgasmnode;
|
|
cstatementnode:=tcgstatementnode;
|
|
cblocknode:=tcgblocknode;
|
|
ctempcreatenode:=tcgtempcreatenode;
|
|
ctemprefnode:=tcgtemprefnode;
|
|
ctempdeletenode:=tcgtempdeletenode;
|
|
end.
|