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225 lines
8.2 KiB
ObjectPascal
225 lines
8.2 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1993-98 by Florian Klaempfl
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Generate i386 assembler for constants
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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 cg386con;
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interface
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uses tree;
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procedure secondrealconst(var p : ptree);
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procedure secondfixconst(var p : ptree);
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procedure secondordconst(var p : ptree);
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procedure secondniln(var p : ptree);
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procedure secondstringconst(var p : ptree);
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implementation
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uses
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cobjects,verbose,
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symtable,aasm,i386,
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hcodegen;
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procedure secondrealconst(var p : ptree);
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var
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hp1 : pai;
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lastlabel : plabel;
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found : boolean;
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begin
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clear_reference(p^.location.reference);
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lastlabel:=nil;
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found:=false;
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{ const already used ? }
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if p^.labnumber=-1 then
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begin
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{ tries to found an old entry }
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hp1:=pai(consts^.first);
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while assigned(hp1) do
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begin
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if hp1^.typ=ait_label then
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lastlabel:=pai_label(hp1)^.l
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else
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begin
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if (hp1^.typ=p^.realtyp) and (lastlabel<>nil) then
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begin
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if ((p^.realtyp=ait_real_64bit) and (pai_double(hp1)^.value=p^.valued)) or
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((p^.realtyp=ait_real_extended) and (pai_extended(hp1)^.value=p^.valued)) or
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((p^.realtyp=ait_real_32bit) and (pai_single(hp1)^.value=p^.valued)) then
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begin
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{ found! }
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p^.labnumber:=lastlabel^.nb;
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break;
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end;
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end;
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lastlabel:=nil;
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end;
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hp1:=pai(hp1^.next);
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end;
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{ :-(, we must generate a new entry }
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if p^.labnumber=-1 then
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begin
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getlabel(lastlabel);
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p^.labnumber:=lastlabel^.nb;
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concat_constlabel(lastlabel,constreal);
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case p^.realtyp of
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ait_real_64bit : consts^.concat(new(pai_double,init(p^.valued)));
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ait_real_32bit : consts^.concat(new(pai_single,init(p^.valued)));
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ait_real_extended : consts^.concat(new(pai_extended,init(p^.valued)));
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else
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internalerror(10120);
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end;
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end;
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end;
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stringdispose(p^.location.reference.symbol);
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if assigned(lastlabel) then
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p^.location.reference.symbol:=stringdup(constlabel2str(lastlabel,constreal))
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else
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p^.location.reference.symbol:=stringdup(constlabelnb2str(p^.labnumber,constreal));
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end;
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procedure secondfixconst(var p : ptree);
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begin
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{ an fix comma const. behaves as a memory reference }
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p^.location.loc:=LOC_MEM;
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p^.location.reference.isintvalue:=true;
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p^.location.reference.offset:=p^.valuef;
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end;
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procedure secondordconst(var p : ptree);
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begin
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{ an integer const. behaves as a memory reference }
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p^.location.loc:=LOC_MEM;
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p^.location.reference.isintvalue:=true;
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p^.location.reference.offset:=p^.value;
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end;
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procedure secondniln(var p : ptree);
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begin
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p^.location.loc:=LOC_MEM;
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p^.location.reference.isintvalue:=true;
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p^.location.reference.offset:=0;
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end;
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procedure secondstringconst(var p : ptree);
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var
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hp1 : pai;
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lastlabel : plabel;
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pc : pchar;
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same_string : boolean;
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i : word;
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begin
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clear_reference(p^.location.reference);
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lastlabel:=nil;
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{ const already used ? }
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if p^.labstrnumber=-1 then
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begin
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{ tries to found an old entry }
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hp1:=pai(consts^.first);
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while assigned(hp1) do
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begin
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if hp1^.typ=ait_label then
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lastlabel:=pai_label(hp1)^.l
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else
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begin
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if (hp1^.typ=ait_string) and (lastlabel<>nil) and
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(pai_string(hp1)^.len=length(p^.values^)+2) then
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begin
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same_string:=true;
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{$ifndef UseAnsiString}
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for i:=1 to length(p^.values^) do
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if pai_string(hp1)^.str[i]<>p^.values^[i] then
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{$else}
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for i:=0 to p^.length do
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if pai_string(hp1)^.str[i]<>p^.values[i] then
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{$endif}
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begin
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same_string:=false;
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break;
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end;
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if same_string then
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begin
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{ found! }
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p^.labstrnumber:=lastlabel^.nb;
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break;
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end;
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end;
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lastlabel:=nil;
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end;
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hp1:=pai(hp1^.next);
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end;
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{ :-(, we must generate a new entry }
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if p^.labstrnumber=-1 then
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begin
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getlabel(lastlabel);
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p^.labstrnumber:=lastlabel^.nb;
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{$ifndef UseAnsiString}
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getmem(pc,length(p^.values^)+3);
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move(p^.values^,pc^,length(p^.values^)+1);
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pc[length(p^.values^)+1]:=#0;
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{$else UseAnsiString}
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pc:=getpcharcopy(p);
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{$endif UseAnsiString}
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concat_constlabel(lastlabel,conststring);
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{$ifdef UseAnsiString}
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{$ifdef debug}
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consts^.concat(new(pai_asm_comment,init('Header of ansistring')));
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{$endif debug}
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consts^.concat(new(pai_const,init_32bit(p^.length)));
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consts^.concat(new(pai_const,init_32bit(p^.length)));
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consts^.concat(new(pai_const,init_32bit(-1)));
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{ to overcome this problem we set the length explicitly }
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{ with the ending null char }
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consts^.concat(new(pai_string,init_length_pchar(pc,p^.length+1)));
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{$else UseAnsiString}
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{ we still will have a problem if there is a #0 inside the pchar }
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consts^.concat(new(pai_string,init_length_pchar(pc,length(p^.values^)+2)));
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{$endif UseAnsiString}
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end;
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end;
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stringdispose(p^.location.reference.symbol);
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if assigned(lastlabel) then
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p^.location.reference.symbol:=stringdup(constlabel2str(lastlabel,conststring))
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else
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p^.location.reference.symbol:=stringdup(constlabelnb2str(p^.labstrnumber,conststring));
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p^.location.loc := LOC_MEM;
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end;
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end.
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{
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$Log$
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Revision 1.2 1998-06-05 16:13:31 pierre
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* fix for real and string consts inside inlined procs
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Revision 1.1 1998/05/23 01:21:02 peter
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+ aktasmmode, aktoptprocessor, aktoutputformat
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+ smartlink per module $SMARTLINK-/+ (like MMX) and moved to aktswitches
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+ $LIBNAME to set the library name where the unit will be put in
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* splitted cgi386 a bit (codeseg to large for bp7)
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* nasm, tasm works again. nasm moved to ag386nsm.pas
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} |