mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-10-31 17:31:42 +01:00
1296 lines
43 KiB
ObjectPascal
1296 lines
43 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998-2000 by Florian Klaempfl
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Generate i386 assembler for nodes that influence the flow
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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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{$ifdef FPC}
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{$goto on}
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{$endif FPC}
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unit cg386flw;
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interface
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uses
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tree;
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procedure second_while_repeatn(var p : ptree);
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procedure secondifn(var p : ptree);
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procedure secondfor(var p : ptree);
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procedure secondexitn(var p : ptree);
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procedure secondbreakn(var p : ptree);
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procedure secondcontinuen(var p : ptree);
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procedure secondgoto(var p : ptree);
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procedure secondlabel(var p : ptree);
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procedure secondraise(var p : ptree);
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procedure secondtryexcept(var p : ptree);
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procedure secondtryfinally(var p : ptree);
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procedure secondon(var p : ptree);
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procedure secondfail(var p : ptree);
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type
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tenumflowcontrol = (fc_exit,fc_break,fc_continue);
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tflowcontrol = set of tenumflowcontrol;
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var
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flowcontrol : tflowcontrol;
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implementation
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uses
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cobjects,verbose,globtype,globals,systems,
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symconst,symtable,aasm,types,
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hcodegen,temp_gen,pass_2,
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cpubase,cpuasm,
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cgai386,tgeni386,tcflw;
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{*****************************************************************************
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Second_While_RepeatN
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*****************************************************************************}
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procedure second_while_repeatn(var p : ptree);
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var
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lcont,lbreak,lloop,
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oldclabel,oldblabel : pasmlabel;
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otlabel,oflabel : pasmlabel;
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begin
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getlabel(lloop);
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getlabel(lcont);
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getlabel(lbreak);
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{ arrange continue and breaklabels: }
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oldclabel:=aktcontinuelabel;
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oldblabel:=aktbreaklabel;
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{ handling code at the end as it is much more efficient, and makes
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while equal to repeat loop, only the end true/false is swapped (PFV) }
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if p^.treetype=whilen then
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emitjmp(C_None,lcont);
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emitlab(lloop);
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aktcontinuelabel:=lcont;
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aktbreaklabel:=lbreak;
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cleartempgen;
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if assigned(p^.right) then
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secondpass(p^.right);
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emitlab(lcont);
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otlabel:=truelabel;
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oflabel:=falselabel;
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if p^.treetype=whilen then
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begin
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truelabel:=lloop;
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falselabel:=lbreak;
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end
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{ repeatn }
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else
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begin
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truelabel:=lbreak;
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falselabel:=lloop;
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end;
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cleartempgen;
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secondpass(p^.left);
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maketojumpbool(p^.left);
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emitlab(lbreak);
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truelabel:=otlabel;
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falselabel:=oflabel;
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aktcontinuelabel:=oldclabel;
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aktbreaklabel:=oldblabel;
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{ a break/continue in a while/repeat block can't be seen outside }
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flowcontrol:=flowcontrol-[fc_break,fc_continue];
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end;
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{*****************************************************************************
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SecondIfN
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*****************************************************************************}
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procedure secondifn(var p : ptree);
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var
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hl,otlabel,oflabel : pasmlabel;
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begin
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otlabel:=truelabel;
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oflabel:=falselabel;
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getlabel(truelabel);
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getlabel(falselabel);
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cleartempgen;
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secondpass(p^.left);
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maketojumpbool(p^.left);
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if assigned(p^.right) then
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begin
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emitlab(truelabel);
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cleartempgen;
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secondpass(p^.right);
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end;
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if assigned(p^.t1) then
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begin
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if assigned(p^.right) then
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begin
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getlabel(hl);
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{ do go back to if line !! }
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aktfilepos:=exprasmlist^.getlasttaifilepos^;
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emitjmp(C_None,hl);
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end;
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emitlab(falselabel);
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cleartempgen;
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secondpass(p^.t1);
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if assigned(p^.right) then
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emitlab(hl);
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end
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else
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begin
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emitlab(falselabel);
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end;
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if not(assigned(p^.right)) then
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begin
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emitlab(truelabel);
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end;
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truelabel:=otlabel;
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falselabel:=oflabel;
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end;
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{*****************************************************************************
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SecondFor
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*****************************************************************************}
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procedure secondfor(var p : ptree);
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var
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l3,oldclabel,oldblabel : pasmlabel;
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omitfirstcomp,temptovalue : boolean;
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hs : byte;
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temp1 : treference;
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hop : tasmop;
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hcond : tasmcond;
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cmpreg,cmp32 : tregister;
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opsize : topsize;
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count_var_is_signed : boolean;
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begin
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oldclabel:=aktcontinuelabel;
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oldblabel:=aktbreaklabel;
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getlabel(aktcontinuelabel);
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getlabel(aktbreaklabel);
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getlabel(l3);
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{ could we spare the first comparison ? }
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omitfirstcomp:=false;
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if p^.right^.treetype=ordconstn then
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if p^.left^.right^.treetype=ordconstn then
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omitfirstcomp:=(p^.backward and (p^.left^.right^.value>=p^.right^.value))
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or (not(p^.backward) and (p^.left^.right^.value<=p^.right^.value));
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{ only calculate reference }
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cleartempgen;
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secondpass(p^.t2);
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hs:=p^.t2^.resulttype^.size;
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cmp32:=getregister32;
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case hs of
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1 : begin
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opsize:=S_B;
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cmpreg:=reg32toreg8(cmp32);
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end;
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2 : begin
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opsize:=S_W;
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cmpreg:=reg32toreg16(cmp32);
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end;
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4 : begin
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opsize:=S_L;
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cmpreg:=cmp32;
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end;
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end;
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{ first set the to value
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because the count var can be in the expression !! }
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cleartempgen;
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secondpass(p^.right);
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{ calculate pointer value and check if changeable and if so }
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{ load into temporary variable }
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if p^.right^.treetype<>ordconstn then
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begin
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temp1.symbol:=nil;
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gettempofsizereference(hs,temp1);
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temptovalue:=true;
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if (p^.right^.location.loc=LOC_REGISTER) or
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(p^.right^.location.loc=LOC_CREGISTER) then
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begin
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emit_reg_ref(A_MOV,opsize,p^.right^.location.register,
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newreference(temp1));
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end
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else
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concatcopy(p^.right^.location.reference,temp1,hs,false,false);
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end
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else
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temptovalue:=false;
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{ produce start assignment }
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cleartempgen;
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secondpass(p^.left);
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count_var_is_signed:=is_signed(porddef(p^.t2^.resulttype));
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if temptovalue then
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begin
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if p^.t2^.location.loc=LOC_CREGISTER then
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begin
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emit_ref_reg(A_CMP,opsize,newreference(temp1),
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p^.t2^.location.register);
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end
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else
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begin
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emit_ref_reg(A_MOV,opsize,newreference(p^.t2^.location.reference),
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cmpreg);
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emit_ref_reg(A_CMP,opsize,newreference(temp1),
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cmpreg);
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end;
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end
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else
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begin
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if not(omitfirstcomp) then
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begin
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if p^.t2^.location.loc=LOC_CREGISTER then
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emit_const_reg(A_CMP,opsize,p^.right^.value,
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p^.t2^.location.register)
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else
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emit_const_ref(A_CMP,opsize,p^.right^.value,
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newreference(p^.t2^.location.reference));
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end;
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end;
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if p^.backward then
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if count_var_is_signed then
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hcond:=C_L
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else
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hcond:=C_B
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else
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if count_var_is_signed then
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hcond:=C_G
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else
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hcond:=C_A;
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if not(omitfirstcomp) or temptovalue then
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emitjmp(hcond,aktbreaklabel);
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{ align loop target }
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if not(cs_littlesize in aktglobalswitches) then
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exprasmlist^.concat(new(pai_align,init_op(4,$90)));
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emitlab(l3);
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{ help register must not be in instruction block }
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cleartempgen;
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if assigned(p^.t1) then
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secondpass(p^.t1);
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emitlab(aktcontinuelabel);
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{ makes no problems there }
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cleartempgen;
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{ demand help register again }
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cmp32:=getregister32;
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case hs of
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1 : begin
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opsize:=S_B;
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cmpreg:=reg32toreg8(cmp32);
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end;
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2 : begin
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opsize:=S_W;
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cmpreg:=reg32toreg16(cmp32);
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end;
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4 : opsize:=S_L;
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end;
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{ produce comparison and the corresponding }
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{ jump }
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if temptovalue then
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begin
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if p^.t2^.location.loc=LOC_CREGISTER then
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begin
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emit_ref_reg(A_CMP,opsize,newreference(temp1),
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p^.t2^.location.register);
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end
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else
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begin
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emit_ref_reg(A_MOV,opsize,newreference(p^.t2^.location.reference),
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cmpreg);
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emit_ref_reg(A_CMP,opsize,newreference(temp1),
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cmpreg);
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end;
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end
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else
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begin
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if p^.t2^.location.loc=LOC_CREGISTER then
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emit_const_reg(A_CMP,opsize,p^.right^.value,
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p^.t2^.location.register)
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else
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emit_const_ref(A_CMP,opsize,p^.right^.value,
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newreference(p^.t2^.location.reference));
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end;
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if p^.backward then
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if count_var_is_signed then
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hcond:=C_LE
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else
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hcond:=C_BE
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else
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if count_var_is_signed then
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hcond:=C_GE
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else
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hcond:=C_AE;
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emitjmp(hcond,aktbreaklabel);
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{ according to count direction DEC or INC... }
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{ must be after the test because of 0to 255 for bytes !! }
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if p^.backward then
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hop:=A_DEC
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else
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hop:=A_INC;
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if p^.t2^.location.loc=LOC_CREGISTER then
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emit_reg(hop,opsize,p^.t2^.location.register)
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else
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emit_ref(hop,opsize,newreference(p^.t2^.location.reference));
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emitjmp(C_None,l3);
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{ this is the break label: }
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emitlab(aktbreaklabel);
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ungetregister32(cmp32);
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if temptovalue then
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ungetiftemp(temp1);
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aktcontinuelabel:=oldclabel;
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aktbreaklabel:=oldblabel;
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{ a break/continue in a for block can't be seen outside }
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flowcontrol:=flowcontrol-[fc_break,fc_continue];
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end;
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{*****************************************************************************
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SecondExitN
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*****************************************************************************}
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procedure secondexitn(var p : ptree);
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var
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is_mem : boolean;
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{op : tasmop;
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s : topsize;}
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otlabel,oflabel : pasmlabel;
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label
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do_jmp;
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begin
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include(flowcontrol,fc_exit);
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if assigned(p^.left) then
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if p^.left^.treetype=assignn then
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begin
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{ just do a normal assignment followed by exit }
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secondpass(p^.left);
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emitjmp(C_None,aktexitlabel);
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end
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else
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begin
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otlabel:=truelabel;
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oflabel:=falselabel;
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getlabel(truelabel);
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getlabel(falselabel);
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secondpass(p^.left);
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case p^.left^.location.loc of
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LOC_FPU : goto do_jmp;
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LOC_MEM,
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LOC_REFERENCE : is_mem:=true;
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LOC_CREGISTER,
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LOC_REGISTER : is_mem:=false;
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LOC_FLAGS : begin
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emit_flag2reg(p^.left^.location.resflags,R_AL);
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goto do_jmp;
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end;
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LOC_JUMP : begin
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emitlab(truelabel);
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emit_const_reg(A_MOV,S_B,1,R_AL);
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emitjmp(C_None,aktexit2label);
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emitlab(falselabel);
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emit_reg_reg(A_XOR,S_B,R_AL,R_AL);
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goto do_jmp;
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end;
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else
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internalerror(2001);
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end;
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case procinfo^.returntype.def^.deftype of
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pointerdef,
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procvardef : begin
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if is_mem then
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emit_ref_reg(A_MOV,S_L,
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newreference(p^.left^.location.reference),R_EAX)
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else
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emit_reg_reg(A_MOV,S_L,
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p^.left^.location.register,R_EAX);
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end;
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floatdef : begin
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if pfloatdef(procinfo^.returntype.def)^.typ=f32bit then
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begin
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if is_mem then
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emit_ref_reg(A_MOV,S_L,
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newreference(p^.left^.location.reference),R_EAX)
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else
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emit_reg_reg(A_MOV,S_L,p^.left^.location.register,R_EAX);
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end
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else
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if is_mem then
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floatload(pfloatdef(procinfo^.returntype.def)^.typ,p^.left^.location.reference);
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end;
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{ orddef,
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enumdef : }
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else
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{ it can be anything shorter than 4 bytes PM
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this caused form bug 711 }
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begin
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case procinfo^.returntype.def^.size of
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{ if its 3 bytes only we can still
|
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copy one of garbage ! PM }
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4,3 : if is_mem then
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emit_ref_reg(A_MOV,S_L,
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newreference(p^.left^.location.reference),R_EAX)
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else
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emit_reg_reg(A_MOV,S_L,p^.left^.location.register,R_EAX);
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2 : if is_mem then
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emit_ref_reg(A_MOV,S_W,
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newreference(p^.left^.location.reference),R_AX)
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else
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emit_reg_reg(A_MOV,S_W,makereg16(p^.left^.location.register),R_AX);
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1 : if is_mem then
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emit_ref_reg(A_MOV,S_B,
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newreference(p^.left^.location.reference),R_AL)
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else
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emit_reg_reg(A_MOV,S_B,makereg8(p^.left^.location.register),R_AL);
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end;
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end;
|
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end;
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do_jmp:
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truelabel:=otlabel;
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falselabel:=oflabel;
|
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emitjmp(C_None,aktexit2label);
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end
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else
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begin
|
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emitjmp(C_None,aktexitlabel);
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end;
|
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end;
|
|
|
|
|
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{*****************************************************************************
|
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SecondBreakN
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*****************************************************************************}
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|
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procedure secondbreakn(var p : ptree);
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begin
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include(flowcontrol,fc_break);
|
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if aktbreaklabel<>nil then
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emitjmp(C_None,aktbreaklabel)
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else
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CGMessage(cg_e_break_not_allowed);
|
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end;
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|
|
|
|
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{*****************************************************************************
|
|
SecondContinueN
|
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*****************************************************************************}
|
|
|
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procedure secondcontinuen(var p : ptree);
|
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begin
|
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include(flowcontrol,fc_continue);
|
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if aktcontinuelabel<>nil then
|
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emitjmp(C_None,aktcontinuelabel)
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else
|
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CGMessage(cg_e_continue_not_allowed);
|
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end;
|
|
|
|
|
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{*****************************************************************************
|
|
SecondGoto
|
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*****************************************************************************}
|
|
|
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procedure secondgoto(var p : ptree);
|
|
|
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begin
|
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emitjmp(C_None,p^.labelnr);
|
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{ the assigned avoids only crashes if the label isn't defined }
|
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if assigned(p^.labsym) and
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assigned(p^.labsym^.code) and
|
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(aktexceptblock<>ptree(p^.labsym^.code)^.exceptionblock) then
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CGMessage(cg_e_goto_inout_of_exception_block);
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end;
|
|
|
|
|
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{*****************************************************************************
|
|
SecondLabel
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|
*****************************************************************************}
|
|
|
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procedure secondlabel(var p : ptree);
|
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begin
|
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emitlab(p^.labelnr);
|
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cleartempgen;
|
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secondpass(p^.left);
|
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end;
|
|
|
|
|
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{*****************************************************************************
|
|
SecondRaise
|
|
*****************************************************************************}
|
|
|
|
procedure secondraise(var p : ptree);
|
|
|
|
var
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a : pasmlabel;
|
|
|
|
begin
|
|
if assigned(p^.left) then
|
|
begin
|
|
{ generate the address }
|
|
if assigned(p^.right) then
|
|
begin
|
|
secondpass(p^.right);
|
|
if codegenerror then
|
|
exit;
|
|
emit_push_loc(p^.right^.location);
|
|
end
|
|
else
|
|
begin
|
|
getlabel(a);
|
|
emitlab(a);
|
|
emit_sym(A_PUSH,S_L,a);
|
|
end;
|
|
secondpass(p^.left);
|
|
if codegenerror then
|
|
exit;
|
|
|
|
case p^.left^.location.loc of
|
|
LOC_MEM,LOC_REFERENCE:
|
|
emit_ref(A_PUSH,S_L,
|
|
newreference(p^.left^.location.reference));
|
|
LOC_CREGISTER,LOC_REGISTER : emit_reg(A_PUSH,S_L,
|
|
p^.left^.location.register);
|
|
else CGMessage(type_e_mismatch);
|
|
end;
|
|
emitcall('FPC_RAISEEXCEPTION');
|
|
end
|
|
else
|
|
begin
|
|
emitcall('FPC_POPADDRSTACK');
|
|
emitcall('FPC_RERAISE');
|
|
end;
|
|
end;
|
|
|
|
|
|
{*****************************************************************************
|
|
SecondTryExcept
|
|
*****************************************************************************}
|
|
|
|
var
|
|
endexceptlabel : pasmlabel;
|
|
|
|
{ does the necessary things to clean up the object stack }
|
|
{ in the except block }
|
|
procedure cleanupobjectstack;
|
|
|
|
begin
|
|
emitcall('FPC_POPOBJECTSTACK');
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_reg(A_PUSH,S_L,R_EAX);
|
|
emitcall('FPC_DESTROYEXCEPTION');
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
maybe_loadesi;
|
|
end;
|
|
|
|
{ pops one element from the exception address stack }
|
|
{ and removes the flag }
|
|
procedure cleanupaddrstack;
|
|
|
|
begin
|
|
emitcall('FPC_POPADDRSTACK');
|
|
{ allocate eax }
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_reg(A_POP,S_L,R_EAX);
|
|
{ deallocate eax }
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
end;
|
|
|
|
procedure secondtryexcept(var p : ptree);
|
|
|
|
var
|
|
exceptlabel,doexceptlabel,oldendexceptlabel,
|
|
lastonlabel,
|
|
exitexceptlabel,
|
|
continueexceptlabel,
|
|
breakexceptlabel,
|
|
exittrylabel,
|
|
continuetrylabel,
|
|
breaktrylabel,
|
|
doobjectdestroy,
|
|
doobjectdestroyandreraise,
|
|
oldaktexitlabel,
|
|
oldaktexit2label,
|
|
oldaktcontinuelabel,
|
|
oldaktbreaklabel : pasmlabel;
|
|
oldexceptblock : ptree;
|
|
|
|
|
|
oldflowcontrol,tryflowcontrol,
|
|
exceptflowcontrol : tflowcontrol;
|
|
|
|
begin
|
|
oldflowcontrol:=flowcontrol;
|
|
flowcontrol:=[];
|
|
{ this can be called recursivly }
|
|
oldendexceptlabel:=endexceptlabel;
|
|
|
|
{ we modify EAX }
|
|
usedinproc:=usedinproc or ($80 shr byte(R_EAX));
|
|
|
|
{ save the old labels for control flow statements }
|
|
oldaktexitlabel:=aktexitlabel;
|
|
oldaktexit2label:=aktexit2label;
|
|
if assigned(aktbreaklabel) then
|
|
begin
|
|
oldaktcontinuelabel:=aktcontinuelabel;
|
|
oldaktbreaklabel:=aktbreaklabel;
|
|
end;
|
|
|
|
{ get new labels for the control flow statements }
|
|
getlabel(exittrylabel);
|
|
getlabel(exitexceptlabel);
|
|
if assigned(aktbreaklabel) then
|
|
begin
|
|
getlabel(breaktrylabel);
|
|
getlabel(continuetrylabel);
|
|
getlabel(breakexceptlabel);
|
|
getlabel(continueexceptlabel);
|
|
end;
|
|
|
|
getlabel(exceptlabel);
|
|
getlabel(doexceptlabel);
|
|
getlabel(endexceptlabel);
|
|
getlabel(lastonlabel);
|
|
push_int (1); { push type of exceptionframe }
|
|
emitcall('FPC_PUSHEXCEPTADDR');
|
|
{ allocate eax }
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_reg(A_PUSH,S_L,R_EAX);
|
|
emitcall('FPC_SETJMP');
|
|
emit_reg(A_PUSH,S_L,R_EAX);
|
|
emit_reg_reg(A_TEST,S_L,R_EAX,R_EAX);
|
|
{ deallocate eax }
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
emitjmp(C_NE,exceptlabel);
|
|
|
|
{ try block }
|
|
{ set control flow labels for the try block }
|
|
aktexitlabel:=exittrylabel;
|
|
aktexit2label:=exittrylabel;
|
|
if assigned(oldaktbreaklabel) then
|
|
begin
|
|
aktcontinuelabel:=continuetrylabel;
|
|
aktbreaklabel:=breaktrylabel;
|
|
end;
|
|
|
|
oldexceptblock:=aktexceptblock;
|
|
aktexceptblock:=p^.left;
|
|
flowcontrol:=[];
|
|
secondpass(p^.left);
|
|
tryflowcontrol:=flowcontrol;
|
|
aktexceptblock:=oldexceptblock;
|
|
if codegenerror then
|
|
exit;
|
|
|
|
emitlab(exceptlabel);
|
|
emitcall('FPC_POPADDRSTACK');
|
|
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_reg(A_POP,S_L,R_EAX);
|
|
emit_reg_reg(A_TEST,S_L,R_EAX,R_EAX);
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
|
|
emitjmp(C_E,endexceptlabel);
|
|
emitlab(doexceptlabel);
|
|
|
|
{ set control flow labels for the except block }
|
|
{ and the on statements }
|
|
aktexitlabel:=exitexceptlabel;
|
|
aktexit2label:=exitexceptlabel;
|
|
if assigned(oldaktbreaklabel) then
|
|
begin
|
|
aktcontinuelabel:=continueexceptlabel;
|
|
aktbreaklabel:=breakexceptlabel;
|
|
end;
|
|
|
|
flowcontrol:=[];
|
|
{ on statements }
|
|
if assigned(p^.right) then
|
|
begin
|
|
oldexceptblock:=aktexceptblock;
|
|
aktexceptblock:=p^.right;
|
|
secondpass(p^.right);
|
|
aktexceptblock:=oldexceptblock;
|
|
end;
|
|
|
|
emitlab(lastonlabel);
|
|
{ default handling except handling }
|
|
if assigned(p^.t1) then
|
|
begin
|
|
{ FPC_CATCHES must be called with
|
|
'default handler' flag (=-1)
|
|
}
|
|
push_int (-1);
|
|
emitcall('FPC_CATCHES');
|
|
maybe_loadesi;
|
|
|
|
{ the destruction of the exception object must be also }
|
|
{ guarded by an exception frame }
|
|
getlabel(doobjectdestroy);
|
|
getlabel(doobjectdestroyandreraise);
|
|
exprasmlist^.concat(new(paicpu,op_const(A_PUSH,S_L,1)));
|
|
emitcall('FPC_PUSHEXCEPTADDR');
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
exprasmlist^.concat(new(paicpu,
|
|
op_reg(A_PUSH,S_L,R_EAX)));
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
emitcall('FPC_SETJMP');
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
exprasmlist^.concat(new(paicpu,
|
|
op_reg(A_PUSH,S_L,R_EAX)));
|
|
exprasmlist^.concat(new(paicpu,
|
|
op_reg_reg(A_TEST,S_L,R_EAX,R_EAX)));
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
emitjmp(C_NE,doobjectdestroyandreraise);
|
|
|
|
oldexceptblock:=aktexceptblock;
|
|
aktexceptblock:=p^.t1;
|
|
{ here we don't have to reset flowcontrol }
|
|
{ the default and on flowcontrols are handled equal }
|
|
secondpass(p^.t1);
|
|
exceptflowcontrol:=flowcontrol;
|
|
aktexceptblock:=oldexceptblock;
|
|
|
|
emitlab(doobjectdestroyandreraise);
|
|
emitcall('FPC_POPADDRSTACK');
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
exprasmlist^.concat(new(paicpu,
|
|
op_reg(A_POP,S_L,R_EAX)));
|
|
exprasmlist^.concat(new(paicpu,
|
|
op_reg_reg(A_TEST,S_L,R_EAX,R_EAX)));
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
emitjmp(C_E,doobjectdestroy);
|
|
emitcall('FPC_POPSECONDOBJECTSTACK');
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_reg(A_PUSH,S_L,R_EAX);
|
|
emitcall('FPC_DESTROYEXCEPTION');
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
{ we don't need to restore esi here because reraise never }
|
|
{ returns }
|
|
emitcall('FPC_RERAISE');
|
|
|
|
emitlab(doobjectdestroy);
|
|
cleanupobjectstack;
|
|
emitjmp(C_None,endexceptlabel);
|
|
end
|
|
else
|
|
begin
|
|
emitcall('FPC_RERAISE');
|
|
exceptflowcontrol:=flowcontrol;
|
|
end;
|
|
|
|
if fc_exit in exceptflowcontrol then
|
|
begin
|
|
{ do some magic for exit in the try block }
|
|
emitlab(exitexceptlabel);
|
|
{ we must also destroy the address frame which guards }
|
|
{ exception object }
|
|
cleanupaddrstack;
|
|
cleanupobjectstack;
|
|
emitjmp(C_None,oldaktexitlabel);
|
|
end;
|
|
|
|
if fc_break in exceptflowcontrol then
|
|
begin
|
|
emitlab(breakexceptlabel);
|
|
{ we must also destroy the address frame which guards }
|
|
{ exception object }
|
|
cleanupaddrstack;
|
|
cleanupobjectstack;
|
|
emitjmp(C_None,oldaktbreaklabel);
|
|
end;
|
|
|
|
if fc_continue in exceptflowcontrol then
|
|
begin
|
|
emitlab(continueexceptlabel);
|
|
{ we must also destroy the address frame which guards }
|
|
{ exception object }
|
|
cleanupaddrstack;
|
|
cleanupobjectstack;
|
|
emitjmp(C_None,oldaktcontinuelabel);
|
|
end;
|
|
|
|
if fc_exit in tryflowcontrol then
|
|
begin
|
|
{ do some magic for exit in the try block }
|
|
emitlab(exittrylabel);
|
|
cleanupaddrstack;
|
|
emitjmp(C_None,oldaktexitlabel);
|
|
end;
|
|
|
|
if fc_break in tryflowcontrol then
|
|
begin
|
|
emitlab(breaktrylabel);
|
|
cleanupaddrstack;
|
|
emitjmp(C_None,oldaktbreaklabel);
|
|
end;
|
|
|
|
if fc_continue in tryflowcontrol then
|
|
begin
|
|
emitlab(continuetrylabel);
|
|
cleanupaddrstack;
|
|
emitjmp(C_None,oldaktcontinuelabel);
|
|
end;
|
|
|
|
emitlab(endexceptlabel);
|
|
|
|
endexceptlabel:=oldendexceptlabel;
|
|
|
|
{ restore the control flow labels }
|
|
aktexitlabel:=oldaktexitlabel;
|
|
aktexit2label:=oldaktexit2label;
|
|
if assigned(oldaktbreaklabel) then
|
|
begin
|
|
aktcontinuelabel:=oldaktcontinuelabel;
|
|
aktbreaklabel:=oldaktbreaklabel;
|
|
end;
|
|
|
|
{ return all used control flow statements }
|
|
flowcontrol:=oldflowcontrol+exceptflowcontrol+
|
|
tryflowcontrol;
|
|
end;
|
|
|
|
procedure secondon(var p : ptree);
|
|
|
|
var
|
|
nextonlabel,
|
|
exitonlabel,
|
|
continueonlabel,
|
|
breakonlabel,
|
|
oldaktexitlabel,
|
|
oldaktexit2label,
|
|
oldaktcontinuelabel,
|
|
doobjectdestroyandreraise,
|
|
doobjectdestroy,
|
|
oldaktbreaklabel : pasmlabel;
|
|
ref : treference;
|
|
oldexceptblock : ptree;
|
|
oldflowcontrol : tflowcontrol;
|
|
|
|
begin
|
|
oldflowcontrol:=flowcontrol;
|
|
flowcontrol:=[];
|
|
getlabel(nextonlabel);
|
|
|
|
{ push the vmt }
|
|
emit_sym(A_PUSH,S_L,
|
|
newasmsymbol(p^.excepttype^.vmt_mangledname));
|
|
emitcall('FPC_CATCHES');
|
|
{ allocate eax }
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_reg_reg(A_TEST,S_L,R_EAX,R_EAX);
|
|
emitjmp(C_E,nextonlabel);
|
|
ref.symbol:=nil;
|
|
gettempofsizereference(4,ref);
|
|
|
|
{ what a hack ! }
|
|
if assigned(p^.exceptsymtable) then
|
|
pvarsym(p^.exceptsymtable^.symindex^.first)^.address:=ref.offset;
|
|
|
|
emit_reg_ref(A_MOV,S_L,
|
|
R_EAX,newreference(ref));
|
|
{ deallocate eax }
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
|
|
{ in the case that another exception is risen }
|
|
{ we've to destroy the old one }
|
|
getlabel(doobjectdestroyandreraise);
|
|
exprasmlist^.concat(new(paicpu,op_const(A_PUSH,S_L,1)));
|
|
emitcall('FPC_PUSHEXCEPTADDR');
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
exprasmlist^.concat(new(paicpu,
|
|
op_reg(A_PUSH,S_L,R_EAX)));
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
emitcall('FPC_SETJMP');
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
exprasmlist^.concat(new(paicpu,
|
|
op_reg(A_PUSH,S_L,R_EAX)));
|
|
exprasmlist^.concat(new(paicpu,
|
|
op_reg_reg(A_TEST,S_L,R_EAX,R_EAX)));
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
emitjmp(C_NE,doobjectdestroyandreraise);
|
|
|
|
if assigned(p^.right) then
|
|
begin
|
|
oldaktexitlabel:=aktexitlabel;
|
|
oldaktexit2label:=aktexit2label;
|
|
getlabel(exitonlabel);
|
|
aktexitlabel:=exitonlabel;
|
|
aktexit2label:=exitonlabel;
|
|
if assigned(aktbreaklabel) then
|
|
begin
|
|
oldaktcontinuelabel:=aktcontinuelabel;
|
|
oldaktbreaklabel:=aktbreaklabel;
|
|
getlabel(breakonlabel);
|
|
getlabel(continueonlabel);
|
|
aktcontinuelabel:=continueonlabel;
|
|
aktbreaklabel:=breakonlabel;
|
|
end;
|
|
|
|
{ esi is destroyed by FPC_CATCHES }
|
|
maybe_loadesi;
|
|
oldexceptblock:=aktexceptblock;
|
|
aktexceptblock:=p^.right;
|
|
secondpass(p^.right);
|
|
aktexceptblock:=oldexceptblock;
|
|
end;
|
|
getlabel(doobjectdestroy);
|
|
emitlab(doobjectdestroyandreraise);
|
|
emitcall('FPC_POPADDRSTACK');
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
exprasmlist^.concat(new(paicpu,
|
|
op_reg(A_POP,S_L,R_EAX)));
|
|
exprasmlist^.concat(new(paicpu,
|
|
op_reg_reg(A_TEST,S_L,R_EAX,R_EAX)));
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
emitjmp(C_E,doobjectdestroy);
|
|
emitcall('FPC_POPSECONDOBJECTSTACK');
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_reg(A_PUSH,S_L,R_EAX);
|
|
emitcall('FPC_DESTROYEXCEPTION');
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
{ we don't need to restore esi here because reraise never }
|
|
{ returns }
|
|
emitcall('FPC_RERAISE');
|
|
|
|
emitlab(doobjectdestroy);
|
|
cleanupobjectstack;
|
|
{ clear some stuff }
|
|
ungetiftemp(ref);
|
|
emitjmp(C_None,endexceptlabel);
|
|
|
|
if assigned(p^.right) then
|
|
begin
|
|
{ special handling for control flow instructions }
|
|
if fc_exit in flowcontrol then
|
|
begin
|
|
{ the address and object pop does secondtryexcept }
|
|
emitlab(exitonlabel);
|
|
emitjmp(C_None,oldaktexitlabel);
|
|
end;
|
|
|
|
if fc_break in flowcontrol then
|
|
begin
|
|
{ the address and object pop does secondtryexcept }
|
|
emitlab(breakonlabel);
|
|
emitjmp(C_None,oldaktbreaklabel);
|
|
end;
|
|
|
|
if fc_continue in flowcontrol then
|
|
begin
|
|
{ the address and object pop does secondtryexcept }
|
|
emitlab(continueonlabel);
|
|
emitjmp(C_None,oldaktcontinuelabel);
|
|
end;
|
|
|
|
aktexitlabel:=oldaktexitlabel;
|
|
aktexit2label:=oldaktexit2label;
|
|
if assigned(oldaktbreaklabel) then
|
|
begin
|
|
aktcontinuelabel:=oldaktcontinuelabel;
|
|
aktbreaklabel:=oldaktbreaklabel;
|
|
end;
|
|
end;
|
|
|
|
emitlab(nextonlabel);
|
|
flowcontrol:=oldflowcontrol+flowcontrol;
|
|
{ next on node }
|
|
if assigned(p^.left) then
|
|
secondpass(p^.left);
|
|
end;
|
|
|
|
{*****************************************************************************
|
|
SecondTryFinally
|
|
*****************************************************************************}
|
|
|
|
procedure secondtryfinally(var p : ptree);
|
|
|
|
var
|
|
reraiselabel,
|
|
finallylabel,
|
|
endfinallylabel,
|
|
exitfinallylabel,
|
|
continuefinallylabel,
|
|
breakfinallylabel,
|
|
oldaktexitlabel,
|
|
oldaktexit2label,
|
|
oldaktcontinuelabel,
|
|
oldaktbreaklabel : pasmlabel;
|
|
oldexceptblock : ptree;
|
|
oldflowcontrol,tryflowcontrol : tflowcontrol;
|
|
decconst : longint;
|
|
|
|
begin
|
|
{ check if child nodes do a break/continue/exit }
|
|
oldflowcontrol:=flowcontrol;
|
|
flowcontrol:=[];
|
|
{ we modify EAX }
|
|
usedinproc:=usedinproc or ($80 shr byte(R_EAX));
|
|
getlabel(finallylabel);
|
|
getlabel(endfinallylabel);
|
|
getlabel(reraiselabel);
|
|
|
|
{ the finally block must catch break, continue and exit }
|
|
{ statements }
|
|
oldaktexitlabel:=aktexitlabel;
|
|
oldaktexit2label:=aktexit2label;
|
|
getlabel(exitfinallylabel);
|
|
aktexitlabel:=exitfinallylabel;
|
|
aktexit2label:=exitfinallylabel;
|
|
if assigned(aktbreaklabel) then
|
|
begin
|
|
oldaktcontinuelabel:=aktcontinuelabel;
|
|
oldaktbreaklabel:=aktbreaklabel;
|
|
getlabel(breakfinallylabel);
|
|
getlabel(continuefinallylabel);
|
|
aktcontinuelabel:=continuefinallylabel;
|
|
aktbreaklabel:=breakfinallylabel;
|
|
end;
|
|
|
|
push_int(1); { Type of stack-frame must be pushed}
|
|
emitcall('FPC_PUSHEXCEPTADDR');
|
|
{ allocate eax }
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_reg(A_PUSH,S_L,R_EAX);
|
|
emitcall('FPC_SETJMP');
|
|
emit_reg(A_PUSH,S_L,R_EAX);
|
|
emit_reg_reg(A_TEST,S_L,R_EAX,R_EAX);
|
|
{ deallocate eax }
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
emitjmp(C_NE,finallylabel);
|
|
|
|
{ try code }
|
|
if assigned(p^.left) then
|
|
begin
|
|
oldexceptblock:=aktexceptblock;
|
|
aktexceptblock:=p^.left;
|
|
secondpass(p^.left);
|
|
tryflowcontrol:=flowcontrol;
|
|
if codegenerror then
|
|
exit;
|
|
aktexceptblock:=oldexceptblock;
|
|
end;
|
|
|
|
emitlab(finallylabel);
|
|
emitcall('FPC_POPADDRSTACK');
|
|
{ finally code }
|
|
oldexceptblock:=aktexceptblock;
|
|
aktexceptblock:=p^.right;
|
|
flowcontrol:=[];
|
|
secondpass(p^.right);
|
|
if flowcontrol<>[] then
|
|
CGMessage(cg_e_control_flow_outside_finally);
|
|
aktexceptblock:=oldexceptblock;
|
|
if codegenerror then
|
|
exit;
|
|
{ allocate eax }
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_reg(A_POP,S_L,R_EAX);
|
|
emit_reg_reg(A_TEST,S_L,R_EAX,R_EAX);
|
|
emitjmp(C_E,endfinallylabel);
|
|
emit_reg(A_DEC,S_L,R_EAX);
|
|
emitjmp(C_Z,reraiselabel);
|
|
if fc_exit in tryflowcontrol then
|
|
begin
|
|
emit_reg(A_DEC,S_L,R_EAX);
|
|
emitjmp(C_Z,oldaktexitlabel);
|
|
decconst:=1;
|
|
end
|
|
else
|
|
decconst:=2;
|
|
if fc_break in tryflowcontrol then
|
|
begin
|
|
emit_const_reg(A_SUB,S_L,decconst,R_EAX);
|
|
emitjmp(C_Z,oldaktbreaklabel);
|
|
decconst:=1;
|
|
end
|
|
else
|
|
inc(decconst);
|
|
if fc_continue in tryflowcontrol then
|
|
begin
|
|
emit_const_reg(A_SUB,S_L,decconst,R_EAX);
|
|
emitjmp(C_Z,oldaktcontinuelabel);
|
|
end;
|
|
{ deallocate eax }
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
emitlab(reraiselabel);
|
|
emitcall('FPC_RERAISE');
|
|
{ do some magic for exit,break,continue in the try block }
|
|
if fc_exit in tryflowcontrol then
|
|
begin
|
|
emitlab(exitfinallylabel);
|
|
{ allocate eax }
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_reg(A_POP,S_L,R_EAX);
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_const(A_PUSH,S_L,2);
|
|
emitjmp(C_NONE,finallylabel);
|
|
end;
|
|
if fc_break in tryflowcontrol then
|
|
begin
|
|
emitlab(breakfinallylabel);
|
|
{ allocate eax }
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_reg(A_POP,S_L,R_EAX);
|
|
{ deallocate eax }
|
|
exprasmlist^.concat(new(pairegalloc,dealloc(R_EAX)));
|
|
emit_const(A_PUSH,S_L,3);
|
|
emitjmp(C_NONE,finallylabel);
|
|
end;
|
|
if fc_continue in tryflowcontrol then
|
|
begin
|
|
emitlab(continuefinallylabel);
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_reg(A_POP,S_L,R_EAX);
|
|
exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
|
|
emit_const(A_PUSH,S_L,4);
|
|
emitjmp(C_NONE,finallylabel);
|
|
end;
|
|
|
|
emitlab(endfinallylabel);
|
|
|
|
aktexitlabel:=oldaktexitlabel;
|
|
aktexit2label:=oldaktexit2label;
|
|
if assigned(aktbreaklabel) then
|
|
begin
|
|
aktcontinuelabel:=oldaktcontinuelabel;
|
|
aktbreaklabel:=oldaktbreaklabel;
|
|
end;
|
|
flowcontrol:=oldflowcontrol+tryflowcontrol;
|
|
end;
|
|
|
|
|
|
{*****************************************************************************
|
|
SecondFail
|
|
*****************************************************************************}
|
|
|
|
procedure secondfail(var p : ptree);
|
|
begin
|
|
emitjmp(C_None,faillabel);
|
|
end;
|
|
|
|
|
|
end.
|
|
{
|
|
$Log$
|
|
Revision 1.70 2000-02-29 23:58:19 pierre
|
|
Use $GOTO ON
|
|
|
|
Revision 1.69 2000/02/10 23:44:42 florian
|
|
* big update for exception handling code generation: possible mem holes
|
|
fixed, break/continue/exit should work always now as expected
|
|
|
|
Revision 1.68 2000/02/09 13:22:47 peter
|
|
* log truncated
|
|
|
|
Revision 1.67 2000/01/21 12:17:42 jonas
|
|
* regallocation fixes
|
|
|
|
Revision 1.66 2000/01/07 01:14:20 peter
|
|
* updated copyright to 2000
|
|
|
|
Revision 1.65 1999/12/22 23:30:06 peter
|
|
* nested try blocks work again
|
|
|
|
Revision 1.64 1999/12/22 01:01:46 peter
|
|
- removed freelabel()
|
|
* added undefined label detection in internal assembler, this prevents
|
|
a lot of ld crashes and wrong .o files
|
|
* .o files aren't written anymore if errors have occured
|
|
* inlining of assembler labels is now correct
|
|
|
|
Revision 1.63 1999/12/19 17:02:45 peter
|
|
* support exit,break,continue in try...except
|
|
* support break,continue in try...finally
|
|
|
|
Revision 1.62 1999/12/17 11:20:06 florian
|
|
* made the goto checking for excpetions more fool proof against errors
|
|
|
|
Revision 1.61 1999/12/14 09:58:41 florian
|
|
+ compiler checks now if a goto leaves an exception block
|
|
|
|
Revision 1.60 1999/12/01 12:36:23 peter
|
|
* fixed selfpointer after destroyexception
|
|
|
|
Revision 1.59 1999/11/30 10:40:42 peter
|
|
+ ttype, tsymlist
|
|
|
|
Revision 1.58 1999/11/28 23:15:23 pierre
|
|
* fix for form bug 721
|
|
|
|
Revision 1.57 1999/11/15 21:49:09 peter
|
|
* push address also for raise at
|
|
|
|
Revision 1.56 1999/11/06 14:34:17 peter
|
|
* truncated log to 20 revs
|
|
|
|
Revision 1.55 1999/10/30 17:35:26 peter
|
|
* fpc_freemem fpc_getmem new callings updated
|
|
|
|
Revision 1.54 1999/10/21 16:41:37 florian
|
|
* problems with readln fixed: esi wasn't restored correctly when
|
|
reading ordinal fields of objects futher the register allocation
|
|
didn't take care of the extra register when reading ordinal values
|
|
* enumerations can now be used in constant indexes of properties
|
|
|
|
Revision 1.53 1999/10/05 22:01:52 pierre
|
|
* bug exit('test') + fail for classes
|
|
|
|
Revision 1.52 1999/09/27 23:44:46 peter
|
|
* procinfo is now a pointer
|
|
* support for result setting in sub procedure
|
|
|
|
Revision 1.51 1999/09/26 13:26:05 florian
|
|
* exception patch of Romio nevertheless the excpetion handling
|
|
needs some corections regarding register saving
|
|
* gettempansistring is again a procedure
|
|
|
|
Revision 1.50 1999/09/20 16:35:43 peter
|
|
* restored old alignment, saves 40k on ppc386
|
|
|
|
Revision 1.49 1999/09/15 20:35:37 florian
|
|
* small fix to operator overloading when in MMX mode
|
|
+ the compiler uses now fldz and fld1 if possible
|
|
+ some fixes to floating point registers
|
|
+ some math. functions (arctan, ln, sin, cos, sqrt, sqr, pi) are now inlined
|
|
* .... ???
|
|
|
|
Revision 1.48 1999/09/07 07:56:37 peter
|
|
* reload esi in except block to allow virtual methods
|
|
|
|
Revision 1.47 1999/08/25 11:59:42 jonas
|
|
* changed pai386, paippc and paiapha (same for tai*) to paicpu (taicpu)
|
|
} |