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533 lines
20 KiB
ObjectPascal
533 lines
20 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
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tree;
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{$define SMALLSETORD}
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procedure secondrealconst(var p : ptree);
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procedure secondfixconst(var p : ptree);
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procedure secondordconst(var p : ptree);
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procedure secondstringconst(var p : ptree);
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procedure secondsetconst(var p : ptree);
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procedure secondniln(var p : ptree);
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implementation
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uses
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globtype,systems,
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cobjects,verbose,globals,
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symtable,aasm,types,
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hcodegen,temp_gen,pass_2,
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{$ifdef ag386bin}
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i386base,i386asm,
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{$else}
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i386,
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{$endif}
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cgai386,tgeni386;
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{*****************************************************************************
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SecondRealConst
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*****************************************************************************}
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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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begin
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lastlabel:=nil;
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{ const already used ? }
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if not assigned(p^.lab_real) 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^.value_real)) or
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((p^.realtyp=ait_real_extended) and (pai_extended(hp1)^.value=p^.value_real)) or
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((p^.realtyp=ait_real_32bit) and (pai_single(hp1)^.value=p^.value_real)) then
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begin
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{ found! }
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p^.lab_real:=lastlabel;
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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 not assigned(p^.lab_real) then
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begin
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getdatalabel(lastlabel);
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p^.lab_real:=lastlabel;
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if (cs_smartlink in aktmoduleswitches) then
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consts^.concat(new(pai_cut,init));
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consts^.concat(new(pai_label,init(lastlabel)));
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case p^.realtyp of
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ait_real_64bit : consts^.concat(new(pai_double,init(p^.value_real)));
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ait_real_32bit : consts^.concat(new(pai_single,init(p^.value_real)));
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ait_real_extended : consts^.concat(new(pai_extended,init(p^.value_real)));
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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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clear_reference(p^.location.reference);
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p^.location.reference.symbol:=newasmsymbol(lab2str(p^.lab_real));
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p^.location.loc:=LOC_MEM;
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end;
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{*****************************************************************************
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SecondFixConst
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*****************************************************************************}
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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.is_immediate:=true;
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p^.location.reference.offset:=p^.value_fix;
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end;
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{*****************************************************************************
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SecondOrdConst
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*****************************************************************************}
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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.is_immediate:=true;
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p^.location.reference.offset:=p^.value;
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end;
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{*****************************************************************************
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SecondStringConst
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*****************************************************************************}
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procedure secondstringconst(var p : ptree);
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var
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hp1 : pai;
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l1,l2,
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lastlabel : plabel;
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pc : pchar;
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same_string : boolean;
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l,j,
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i,mylength : longint;
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begin
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lastlabel:=nil;
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{ const already used ? }
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if not assigned(p^.lab_str) then
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begin
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if is_shortstring(p^.resulttype) then
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mylength:=p^.length+2
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else
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mylength:=p^.length+1;
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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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{ when changing that code, be careful that }
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{ you don't use typed consts, which are }
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{ are also written to consts }
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{ currently, this is no problem, because }
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{ typed consts have no leading length or }
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{ they have no trailing zero }
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if (hp1^.typ=ait_string) and (lastlabel<>nil) and
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(pai_string(hp1)^.len=mylength) then
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begin
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same_string:=true;
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{ if shortstring then check the length byte first and
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set the start index to 1 }
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if is_shortstring(p^.resulttype) then
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begin
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if p^.length<>ord(pai_string(hp1)^.str[0]) then
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same_string:=false;
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j:=1;
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end
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else
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j:=0;
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{ don't check if the length byte was already wrong }
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if same_string then
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begin
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for i:=0 to p^.length do
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begin
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if pai_string(hp1)^.str[j]<>p^.value_str[i] then
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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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inc(j);
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end;
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end;
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{ found ? }
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if same_string then
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begin
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p^.lab_str:=lastlabel;
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{ create a new entry for ansistrings, but reuse the data }
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if (p^.stringtype in [st_ansistring,st_widestring]) then
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begin
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getdatalabel(l2);
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consts^.concat(new(pai_label,init(l2)));
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consts^.concat(new(pai_const_symbol,init(lab2str(p^.lab_str))));
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{ return the offset of the real string }
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p^.lab_str:=l2;
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end;
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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 not assigned(p^.lab_str) then
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begin
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getdatalabel(lastlabel);
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p^.lab_str:=lastlabel;
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if (cs_smartlink in aktmoduleswitches) then
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consts^.concat(new(pai_cut,init));
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consts^.concat(new(pai_label,init(lastlabel)));
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{ generate an ansi string ? }
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case p^.stringtype of
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st_ansistring:
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begin
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{ an empty ansi string is nil! }
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if p^.length=0 then
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consts^.concat(new(pai_const,init_32bit(0)))
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else
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begin
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getdatalabel(l1);
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getdatalabel(l2);
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consts^.concat(new(pai_label,init(l2)));
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consts^.concat(new(pai_const_symbol,init(lab2str(l1))));
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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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consts^.concat(new(pai_label,init(l1)));
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getmem(pc,p^.length+2);
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move(p^.value_str^,pc^,p^.length);
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pc[p^.length]:=#0;
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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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{ return the offset of the real string }
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p^.lab_str:=l2;
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end;
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end;
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st_shortstring:
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begin
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{ empty strings }
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(* if p^.length=0 then
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{ consts^.concat(new(pai_const,init_16bit(0)))}
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{ this was not very good because several occurence
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needed several data space ! }
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begin
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getmem(pc,3);
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pc[0]:=#0;pc[1]:=#0;
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consts^.concat(new(pai_string,init_length_pchar(pc,2)));
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end
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else *)
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begin
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{ truncate strings larger than 255 chars }
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if p^.length>255 then
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l:=255
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else
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l:=p^.length;
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{ also length and terminating zero }
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getmem(pc,l+3);
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move(p^.value_str^,pc[1],l+1);
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pc[0]:=chr(l);
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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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pc[l+1]:=#0;
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consts^.concat(new(pai_string,init_length_pchar(pc,l+2)));
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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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clear_reference(p^.location.reference);
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p^.location.reference.symbol:=newasmsymbol(lab2str(p^.lab_str));
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p^.location.loc:=LOC_MEM;
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end;
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{*****************************************************************************
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SecondSetCons
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*****************************************************************************}
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procedure secondsetconst(var p : ptree);
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var
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hp1 : pai;
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lastlabel : plabel;
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i : longint;
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neededtyp : tait;
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begin
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{$ifdef SMALLSETORD}
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{ small sets are loaded as constants }
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if psetdef(p^.resulttype)^.settype=smallset then
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begin
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p^.location.loc:=LOC_MEM;
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p^.location.reference.is_immediate:=true;
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p^.location.reference.offset:=plongint(p^.value_set)^;
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exit;
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end;
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{$endif}
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if psetdef(p^.resulttype)^.settype=smallset then
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neededtyp:=ait_const_32bit
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else
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neededtyp:=ait_const_8bit;
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lastlabel:=nil;
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{ const already used ? }
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if not assigned(p^.lab_set) 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 (lastlabel<>nil) and (hp1^.typ=neededtyp) then
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begin
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if (hp1^.typ=ait_const_8bit) then
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begin
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{ compare normal set }
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i:=0;
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while assigned(hp1) and (i<32) do
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begin
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if pai_const(hp1)^.value<>p^.value_set^[i] then
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break;
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inc(i);
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hp1:=pai(hp1^.next);
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end;
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if i=32 then
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begin
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{ found! }
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p^.lab_set:=lastlabel;
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break;
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end;
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{ leave when the end of consts is reached, so no
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hp1^.next is done }
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if not assigned(hp1) then
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break;
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end
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else
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begin
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{ compare small set }
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if plongint(p^.value_set)^=pai_const(hp1)^.value then
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begin
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{ found! }
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p^.lab_set:=lastlabel;
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break;
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end;
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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 not assigned(p^.lab_set) then
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begin
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getdatalabel(lastlabel);
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p^.lab_set:=lastlabel;
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if (cs_smartlink in aktmoduleswitches) then
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consts^.concat(new(pai_cut,init));
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consts^.concat(new(pai_label,init(lastlabel)));
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if psetdef(p^.resulttype)^.settype=smallset then
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begin
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move(p^.value_set^,i,sizeof(longint));
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consts^.concat(new(pai_const,init_32bit(i)));
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end
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else
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begin
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for i:=0 to 31 do
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consts^.concat(new(pai_const,init_8bit(p^.value_set^[i])));
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end;
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end;
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end;
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clear_reference(p^.location.reference);
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p^.location.reference.symbol:=newasmsymbol(lab2str(p^.lab_set));
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p^.location.loc:=LOC_MEM;
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end;
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{*****************************************************************************
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SecondNilN
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*****************************************************************************}
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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.is_immediate:=true;
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p^.location.reference.offset:=0;
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end;
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end.
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{
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$Log$
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Revision 1.31 1999-04-07 15:16:43 pierre
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* zero length string were generated multiple times
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Revision 1.30 1999/03/31 13:51:49 peter
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* shortstring reuse fixed
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Revision 1.29 1999/02/25 21:02:25 peter
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* ag386bin updates
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+ coff writer
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Revision 1.28 1999/02/22 02:15:08 peter
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* updates for ag386bin
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Revision 1.27 1999/01/19 14:21:59 peter
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* shortstring truncated after 255 chars
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Revision 1.26 1998/12/11 00:02:49 peter
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+ globtype,tokens,version unit splitted from globals
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Revision 1.25 1998/12/10 14:39:30 florian
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* bug with p(const a : ansistring) fixed
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* duplicate constant ansistrings were handled wrong, fixed
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Revision 1.24 1998/11/28 15:36:02 michael
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Fixed generation of constant ansistrings
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Revision 1.23 1998/11/26 14:39:12 peter
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* ansistring -> pchar fixed
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* ansistring constants fixed
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* ansistring constants are now written once
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Revision 1.22 1998/11/24 13:40:59 peter
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* release smallsetord, so small sets constant are handled like longints
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Revision 1.21 1998/11/24 12:52:41 peter
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* sets are not written twice anymore
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* optimize for emptyset+single element which uses a new routine from
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set.inc FPC_SET_CREATE_ELEMENT
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Revision 1.20 1998/11/16 12:11:29 peter
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* fixed ansistring crash
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Revision 1.19 1998/11/05 23:40:45 pierre
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* fix for const strings
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Revision 1.18 1998/11/05 15:26:38 pierre
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* fix for missing zero after string const
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Revision 1.17 1998/11/05 12:02:32 peter
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* released useansistring
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* removed -Sv, its now available in fpc modes
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Revision 1.16 1998/11/04 21:07:43 michael
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* undid peters change. Constant ansistrings should end on null too cd ..
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Revision 1.15 1998/11/04 10:11:36 peter
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* ansistring fixes
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Revision 1.14 1998/09/17 09:42:13 peter
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+ pass_2 for cg386
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* Message() -> CGMessage() for pass_1/pass_2
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Revision 1.13 1998/09/07 18:45:53 peter
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* update smartlinking, uses getdatalabel
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* renamed ptree.value vars to value_str,value_real,value_set
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Revision 1.12 1998/08/28 10:56:57 peter
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* removed warnings
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Revision 1.11 1998/08/14 18:18:39 peter
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+ dynamic set contruction
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* smallsets are now working (always longint size)
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Revision 1.10 1998/08/04 13:22:46 pierre
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* weird bug fixed :
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a pchar ' ' (simple space or any other letter) was found to
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be equal to a string of length zero !!!
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thus printing out non sense
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found that out while checking Control-C !!
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+ added column info also in RHIDE format as
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it might be usefull later
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Revision 1.9 1998/07/20 18:40:10 florian
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* handling of ansi string constants should now work
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Revision 1.8 1998/07/20 10:23:00 florian
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* better ansi string assignement
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Revision 1.7 1998/07/18 22:54:25 florian
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* some ansi/wide/longstring support fixed:
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o parameter passing
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o returning as result from functions
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Revision 1.6 1998/07/18 17:11:07 florian
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+ ansi string constants fixed
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+ switch $H partial implemented
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Revision 1.5 1998/06/25 08:48:07 florian
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* first version of rtti support
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Revision 1.4 1998/06/08 13:13:31 pierre
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+ temporary variables now in temp_gen.pas unit
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because it is processor independent
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* mppc68k.bat modified to undefine i386 and support_mmx
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(which are defaults for i386)
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Revision 1.3 1998/06/05 17:44:11 peter
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* splitted cgi386
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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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}
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