mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-05-17 00:22:32 +02:00
270 lines
8.5 KiB
ObjectPascal
270 lines
8.5 KiB
ObjectPascal
{
|
|
$Id$
|
|
Copyright (c) 1998-2000 by Jonas Maebe
|
|
|
|
This unit implements the 80x86 implementation of optimized nodes
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
****************************************************************************
|
|
}
|
|
unit n386opt;
|
|
|
|
{$i defines.inc}
|
|
|
|
interface
|
|
uses node, nopt;
|
|
|
|
type
|
|
ti386addsstringcharoptnode = class(taddsstringcharoptnode)
|
|
function det_resulttype: tnode; override;
|
|
function pass_1: tnode; override;
|
|
procedure pass_2; override;
|
|
end;
|
|
|
|
ti386addsstringcsstringoptnode = class(taddsstringcsstringoptnode)
|
|
{ must be duplicated from ti386addnode :( }
|
|
procedure pass_2; override;
|
|
end;
|
|
|
|
implementation
|
|
|
|
uses pass_1, types, htypechk, cgbase, temp_gen, cpubase, cga,
|
|
tgcpu, aasm, ncnv, ncon, pass_2, symdef;
|
|
|
|
|
|
{*****************************************************************************
|
|
TI386ADDOPTNODE
|
|
*****************************************************************************}
|
|
|
|
function ti386addsstringcharoptnode.det_resulttype: tnode;
|
|
begin
|
|
det_resulttype := nil;
|
|
resulttypepass(left);
|
|
resulttypepass(right);
|
|
if codegenerror then
|
|
exit;
|
|
{ update the curmaxlen field (before converting to a string!) }
|
|
updatecurmaxlen;
|
|
if not is_shortstring(left.resulttype.def) then
|
|
inserttypeconv(left,cshortstringtype);
|
|
resulttype:=left.resulttype;
|
|
end;
|
|
|
|
|
|
function ti386addsstringcharoptnode.pass_1: tnode;
|
|
begin
|
|
pass_1 := nil;
|
|
firstpass(left);
|
|
firstpass(right);
|
|
if codegenerror then
|
|
exit;
|
|
location.loc := LOC_MEM;
|
|
if not is_constcharnode(right) then
|
|
{ it's not sure we need the register, but we can't know it here yet }
|
|
calcregisters(self,2,0,0)
|
|
else
|
|
calcregisters(self,1,0,0);
|
|
end;
|
|
|
|
|
|
procedure ti386addsstringcharoptnode.pass_2;
|
|
var
|
|
l: tasmlabel;
|
|
href2: preference;
|
|
href: treference;
|
|
hreg, lengthreg: tregister;
|
|
checklength: boolean;
|
|
begin
|
|
{ first, we have to more or less replicate some code from }
|
|
{ ti386addnode.pass_2 }
|
|
secondpass(left);
|
|
if not(istemp(left.location.reference) and
|
|
(getsizeoftemp(left.location.reference) = 256)) and
|
|
not(nf_use_strconcat in flags) then
|
|
begin
|
|
gettempofsizereference(256,href);
|
|
copyshortstring(href,left.location.reference,255,false,true);
|
|
{ release the registers }
|
|
ungetiftemp(left.location.reference);
|
|
{ does not hurt: }
|
|
clear_location(left.location);
|
|
left.location.loc:=LOC_MEM;
|
|
left.location.reference:=href;
|
|
end;
|
|
secondpass(right);
|
|
{ special case for string := string + char (JM) }
|
|
hreg := R_NO;
|
|
|
|
{ we have to load the char before checking the length, because we }
|
|
{ may need registers from the reference }
|
|
|
|
{ is it a constant char? }
|
|
if not is_constcharnode(right) then
|
|
{ no, make sure it is in a register }
|
|
if right.location.loc in [LOC_REFERENCE,LOC_MEM] then
|
|
begin
|
|
{ free the registers of right }
|
|
del_reference(right.location.reference);
|
|
{ get register for the char }
|
|
hreg := reg32toreg8(getregister32);
|
|
emit_ref_reg(A_MOV,S_B,
|
|
newreference(right.location.reference),hreg);
|
|
{ I don't think a temp char exists, but it won't hurt (JM) }
|
|
ungetiftemp(right.location.reference);
|
|
end
|
|
else hreg := right.location.register;
|
|
|
|
{ load the current string length }
|
|
lengthreg := getregister32;
|
|
emit_ref_reg(A_MOVZX,S_BL,newreference(left.location.reference),lengthreg);
|
|
|
|
{ do we have to check the length ? }
|
|
if istemp(left.location.reference) then
|
|
checklength := curmaxlen = 255
|
|
else
|
|
checklength := curmaxlen >= tstringdef(left.resulttype.def).len;
|
|
if checklength then
|
|
begin
|
|
{ is it already maximal? }
|
|
getlabel(l);
|
|
if istemp(left.location.reference) then
|
|
emit_const_reg(A_CMP,S_L,255,lengthreg)
|
|
else
|
|
emit_const_reg(A_CMP,S_L,tstringdef(left.resulttype.def).len,lengthreg);
|
|
emitjmp(C_E,l);
|
|
end;
|
|
|
|
{ no, so increase the length and add the new character }
|
|
href2 := newreference(left.location.reference);
|
|
|
|
{ we need a new reference to store the character }
|
|
{ at the end of the string. Check if the base or }
|
|
{ index register is still free }
|
|
if (href2^.base <> R_NO) and
|
|
(href2^.index <> R_NO) then
|
|
begin
|
|
{ they're not free, so add the base reg to }
|
|
{ the string length (since the index can }
|
|
{ have a scalefactor) and use lengthreg as base }
|
|
emit_reg_reg(A_ADD,S_L,href2^.base,lengthreg);
|
|
href2^.base := lengthreg;
|
|
end
|
|
else
|
|
{ at least one is still free, so put EDI there }
|
|
if href2^.base = R_NO then
|
|
href2^.base := lengthreg
|
|
else
|
|
begin
|
|
href2^.index := lengthreg;
|
|
href2^.scalefactor := 1;
|
|
end;
|
|
{ we need to be one position after the last char }
|
|
inc(href2^.offset);
|
|
{ store the character at the end of the string }
|
|
if (right.nodetype <> ordconstn) then
|
|
begin
|
|
{ no new_reference(href2) because it's only }
|
|
{ used once (JM) }
|
|
emit_reg_ref(A_MOV,S_B,hreg,href2);
|
|
ungetregister(hreg);
|
|
end
|
|
else
|
|
emit_const_ref(A_MOV,S_B,tordconstnode(right).value,href2);
|
|
{ increase the string length }
|
|
emit_reg(A_INC,S_B,reg32toreg8(lengthreg));
|
|
emit_reg_ref(A_MOV,S_B,reg32toreg8(lengthreg),
|
|
newreference(left.location.reference));
|
|
ungetregister32(lengthreg);
|
|
if checklength then
|
|
emitlab(l);
|
|
set_location(location,left.location);
|
|
end;
|
|
|
|
procedure ti386addsstringcsstringoptnode.pass_2;
|
|
var
|
|
href: treference;
|
|
pushedregs: tpushed;
|
|
regstopush: byte;
|
|
begin
|
|
{ first, we have to more or less replicate some code from }
|
|
{ ti386addnode.pass_2 }
|
|
secondpass(left);
|
|
if not(istemp(left.location.reference) and
|
|
(getsizeoftemp(left.location.reference) = 256)) and
|
|
not(nf_use_strconcat in flags) then
|
|
begin
|
|
gettempofsizereference(256,href);
|
|
copyshortstring(href,left.location.reference,255,false,true);
|
|
{ release the registers }
|
|
ungetiftemp(left.location.reference);
|
|
{ does not hurt: }
|
|
clear_location(left.location);
|
|
left.location.loc:=LOC_MEM;
|
|
left.location.reference:=href;
|
|
end;
|
|
secondpass(right);
|
|
{ on the right we do not need the register anymore too }
|
|
{ Instead of releasing them already, simply do not }
|
|
{ push them (so the release is in the right place, }
|
|
{ because emitpushreferenceaddr doesn't need extra }
|
|
{ registers) (JM) }
|
|
regstopush := $ff;
|
|
remove_non_regvars_from_loc(right.location,
|
|
regstopush);
|
|
pushusedregisters(pushedregs,regstopush);
|
|
{ push the maximum possible length of the result }
|
|
emitpushreferenceaddr(left.location.reference);
|
|
{ the optimizer can more easily put the }
|
|
{ deallocations in the right place if it happens }
|
|
{ too early than when it happens too late (if }
|
|
{ the pushref needs a "lea (..),edi; push edi") }
|
|
del_reference(right.location.reference);
|
|
emitpushreferenceaddr(right.location.reference);
|
|
saveregvars(regstopush);
|
|
emitcall('FPC_SHORTSTR_CONCAT');
|
|
ungetiftemp(right.location.reference);
|
|
maybe_loadself;
|
|
popusedregisters(pushedregs);
|
|
set_location(location,left.location);
|
|
end;
|
|
|
|
begin
|
|
caddsstringcharoptnode := ti386addsstringcharoptnode;
|
|
caddsstringcsstringoptnode := ti386addsstringcsstringoptnode
|
|
end.
|
|
|
|
{
|
|
$Log$
|
|
Revision 1.5 2001-08-26 13:37:00 florian
|
|
* some cg reorganisation
|
|
* some PPC updates
|
|
|
|
Revision 1.4 2001/04/13 01:22:19 peter
|
|
* symtable change to classes
|
|
* range check generation and errors fixed, make cycle DEBUG=1 works
|
|
* memory leaks fixed
|
|
|
|
Revision 1.3 2001/04/02 21:20:38 peter
|
|
* resulttype rewrite
|
|
|
|
Revision 1.2 2001/01/06 19:12:31 jonas
|
|
* fixed IE 10 (but code is less efficient now :( )
|
|
|
|
Revision 1.1 2001/01/04 11:24:19 jonas
|
|
+ initial implementation (still needs to be made more modular)
|
|
|
|
}
|