mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-04-15 18:59:32 +02:00
a25ebbba3e
o separate information for reading and writing, because e.g. in a
try-block, only the writes to local variables and parameters are
volatile (they have to be committed immediately in case the next
instruction causes an exception)
o for now, only references to absolute memory addresses are marked
as volatile
o the volatily information is (should be) properly maintained throughout
all code generators for all archictures with this patch
o no optimizers or other compiler infrastructure uses the volatility
information yet
o this functionality is not (yet) exposed at the language level, it
is only for internal code generator use right now
git-svn-id: trunk@34996 -
1126 lines
44 KiB
ObjectPascal
1126 lines
44 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Florian Klaempfl
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Generate assembler for nodes that influence the flow which are
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the same for all (most?) processors
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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 ncgflw;
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{$i fpcdefs.inc}
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interface
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uses
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aasmbase,node,nflw,ncgutil;
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type
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tcgwhilerepeatnode = class(twhilerepeatnode)
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usedregvars: tusedregvars;
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procedure pass_generate_code;override;
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procedure sync_regvars(checkusedregvars: boolean);
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end;
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tcgifnode = class(tifnode)
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procedure pass_generate_code;override;
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end;
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tcgfornode = class(tfornode)
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procedure pass_generate_code;override;
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end;
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tcgexitnode = class(texitnode)
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procedure pass_generate_code;override;
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end;
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tcgbreaknode = class(tbreaknode)
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procedure pass_generate_code;override;
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end;
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tcgcontinuenode = class(tcontinuenode)
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procedure pass_generate_code;override;
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end;
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tcggotonode = class(tgotonode)
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procedure pass_generate_code;override;
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end;
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tcglabelnode = class(tlabelnode)
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protected
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asmlabel : tasmlabel;
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public
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function getasmlabel : tasmlabel; virtual;
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procedure pass_generate_code;override;
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end;
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tcgraisenode = class(traisenode)
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end;
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tcgtryexceptnode = class(ttryexceptnode)
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procedure pass_generate_code;override;
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end;
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tcgtryfinallynode = class(ttryfinallynode)
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procedure handle_safecall_exception;
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procedure pass_generate_code;override;
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end;
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tcgonnode = class(tonnode)
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procedure pass_generate_code;override;
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end;
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implementation
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uses
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cutils,
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verbose,globals,systems,globtype,constexp,
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symconst,symdef,symsym,symtable,symtype,aasmtai,aasmdata,aasmcpu,defutil,
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procinfo,cgbase,pass_2,parabase,
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fmodule,
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cpubase,ncon,
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tgobj,paramgr,
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cgutils,cgobj,hlcgobj,nutils
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;
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{*****************************************************************************
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Second_While_RepeatN
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*****************************************************************************}
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procedure tcgwhilerepeatnode.sync_regvars(checkusedregvars: boolean);
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begin
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if (cs_opt_regvar in current_settings.optimizerswitches) and
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not(pi_has_label in current_procinfo.flags) then
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begin
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if checkusedregvars then
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begin
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usedregvars.intregvars.init;
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usedregvars.addrregvars.init;
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usedregvars.fpuregvars.init;
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usedregvars.mmregvars.init;
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{ we have to synchronise both the regvars used in the loop }
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{ and the ones in the while/until condition }
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get_used_regvars(self,usedregvars);
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gen_sync_regvars(current_asmdata.CurrAsmList,usedregvars);
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end
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else
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begin
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gen_sync_regvars(current_asmdata.CurrAsmList,usedregvars);
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usedregvars.intregvars.done;
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usedregvars.addrregvars.done;
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usedregvars.fpuregvars.done;
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usedregvars.mmregvars.done;
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end;
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end;
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end;
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procedure tcgwhilerepeatnode.pass_generate_code;
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var
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lcont,lbreak,lloop,
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oldclabel,oldblabel : tasmlabel;
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truelabel,falselabel : tasmlabel;
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oldflowcontrol : tflowcontrol;
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oldexecutionweight : longint;
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begin
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location_reset(location,LOC_VOID,OS_NO);
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current_asmdata.getjumplabel(lloop);
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current_asmdata.getjumplabel(lcont);
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current_asmdata.getjumplabel(lbreak);
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{ arrange continue and breaklabels: }
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oldflowcontrol:=flowcontrol;
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oldclabel:=current_procinfo.CurrContinueLabel;
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oldblabel:=current_procinfo.CurrBreakLabel;
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include(flowcontrol,fc_inflowcontrol);
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exclude(flowcontrol,fc_unwind_loop);
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sync_regvars(true);
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{$ifdef OLDREGVARS}
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load_all_regvars(current_asmdata.CurrAsmList);
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{$endif OLDREGVARS}
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{ handling code at the end as it is much more efficient, and makes
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while equal to repeat loop, only the end true/false is swapped (PFV) }
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if lnf_testatbegin in loopflags then
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hlcg.a_jmp_always(current_asmdata.CurrAsmList,lcont);
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if not(cs_opt_size in current_settings.optimizerswitches) then
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{ align loop target }
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current_asmdata.CurrAsmList.concat(Tai_align.Create(current_settings.alignment.loopalign));
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hlcg.a_label(current_asmdata.CurrAsmList,lloop);
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current_procinfo.CurrContinueLabel:=lcont;
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current_procinfo.CurrBreakLabel:=lbreak;
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{ calc register weight }
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oldexecutionweight:=cg.executionweight;
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cg.executionweight:=max(cg.executionweight,1)*8;
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if assigned(right) then
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secondpass(right);
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{$ifdef OLDREGVARS}
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load_all_regvars(current_asmdata.CurrAsmList);
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{$endif OLDREGVARS}
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hlcg.a_label(current_asmdata.CurrAsmList,lcont);
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if lnf_checknegate in loopflags then
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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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else
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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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secondpass(left);
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hlcg.maketojumpboollabels(current_asmdata.CurrAsmList,left,truelabel,falselabel);
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cg.executionweight:=oldexecutionweight;
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hlcg.a_label(current_asmdata.CurrAsmList,lbreak);
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sync_regvars(false);
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current_procinfo.CurrContinueLabel:=oldclabel;
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current_procinfo.CurrBreakLabel:=oldblabel;
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{ a break/continue in a while/repeat block can't be seen outside }
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flowcontrol:=oldflowcontrol+(flowcontrol-[fc_break,fc_continue,fc_inflowcontrol]);
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end;
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{*****************************************************************************
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tcgIFNODE
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*****************************************************************************}
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procedure tcgifnode.pass_generate_code;
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var
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hl : tasmlabel;
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oldflowcontrol: tflowcontrol;
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oldexecutionweight : longint;
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(*
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org_regvar_loaded_other,
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then_regvar_loaded_other,
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else_regvar_loaded_other : regvarother_booleanarray;
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org_regvar_loaded_int,
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then_regvar_loaded_int,
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else_regvar_loaded_int : Tsuperregisterset;
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org_list,
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then_list,
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else_list : TAsmList;
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*)
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begin
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location_reset(location,LOC_VOID,OS_NO);
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hl:=nil;
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oldflowcontrol := flowcontrol;
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include(flowcontrol,fc_inflowcontrol);
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secondpass(left);
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(*
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{ save regvars loaded in the beginning so that we can restore them }
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{ when processing the else-block }
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if cs_opt_regvar in current_settings.optimizerswitches then
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begin
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org_list := current_asmdata.CurrAsmList;
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current_asmdata.CurrAsmList := TAsmList.create;
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end;
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*)
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hlcg.maketojumpbool(current_asmdata.CurrAsmList,left);
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(*
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if cs_opt_regvar in current_settings.optimizerswitches then
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begin
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org_regvar_loaded_int := rg.regvar_loaded_int;
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org_regvar_loaded_other := rg.regvar_loaded_other;
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end;
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*)
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{ determines registers weigths }
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oldexecutionweight:=cg.executionweight;
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cg.executionweight:=cg.executionweight div 2;
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if cg.executionweight<1 then
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cg.executionweight:=1;
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if assigned(right) then
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begin
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hlcg.a_label(current_asmdata.CurrAsmList,left.location.truelabel);
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secondpass(right);
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end;
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{ save current asmlist (previous instructions + then-block) and }
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{ loaded regvar state and create new clean ones }
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{
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if cs_opt_regvar in current_settings.optimizerswitches then
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begin
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then_regvar_loaded_int := rg.regvar_loaded_int;
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then_regvar_loaded_other := rg.regvar_loaded_other;
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rg.regvar_loaded_int := org_regvar_loaded_int;
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rg.regvar_loaded_other := org_regvar_loaded_other;
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then_list := current_asmdata.CurrAsmList;
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current_asmdata.CurrAsmList := TAsmList.create;
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end;
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}
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if assigned(t1) then
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begin
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if assigned(right) then
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begin
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current_asmdata.getjumplabel(hl);
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{ do go back to if line !! }
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(*
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if not(cs_opt_regvar in current_settings.optimizerswitches) then
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*)
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current_filepos:=current_asmdata.CurrAsmList.getlasttaifilepos^
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(*
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else
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current_filepos:=then_list.getlasttaifilepos^
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*)
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;
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hlcg.a_jmp_always(current_asmdata.CurrAsmList,hl);
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end;
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hlcg.a_label(current_asmdata.CurrAsmList,left.location.falselabel);
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secondpass(t1);
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(*
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{ save current asmlist (previous instructions + else-block) }
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{ and loaded regvar state and create a new clean list }
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if cs_opt_regvar in current_settings.optimizerswitches then
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begin
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{ else_regvar_loaded_int := rg.regvar_loaded_int;
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else_regvar_loaded_other := rg.regvar_loaded_other;}
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else_list := current_asmdata.CurrAsmList;
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current_asmdata.CurrAsmList := TAsmList.create;
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end;
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*)
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if assigned(right) then
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hlcg.a_label(current_asmdata.CurrAsmList,hl);
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end
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else
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begin
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(*
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if cs_opt_regvar in current_settings.optimizerswitches then
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begin
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{ else_regvar_loaded_int := rg.regvar_loaded_int;
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else_regvar_loaded_other := rg.regvar_loaded_other;}
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else_list := current_asmdata.CurrAsmList;
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current_asmdata.CurrAsmList := TAsmList.create;
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end;
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*)
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hlcg.a_label(current_asmdata.CurrAsmList,left.location.falselabel);
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end;
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if not(assigned(right)) then
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begin
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hlcg.a_label(current_asmdata.CurrAsmList,left.location.truelabel);
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end;
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(*
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if cs_opt_regvar in current_settings.optimizerswitches then
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begin
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{ add loads of regvars at the end of the then- and else-blocks }
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{ so that at the end of both blocks the same regvars are loaded }
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{ no else block? }
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if not assigned(t1) then
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begin
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sync_regvars_int(org_list,then_list,org_regvar_loaded_int,then_regvar_loaded_int);
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sync_regvars_other(org_list,then_list,org_regvar_loaded_other,then_regvar_loaded_other);
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end
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{ no then block? }
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else if not assigned(right) then
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begin
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sync_regvars_int(org_list,else_list,org_regvar_loaded_int,else_regvar_loaded_int);
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sync_regvars_other(org_list,else_list,org_regvar_loaded_other,else_regvar_loaded_other);
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end
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{ both else and then blocks }
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else
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begin
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sync_regvars_int(then_list,else_list,then_regvar_loaded_int,else_regvar_loaded_int);
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sync_regvars_other(then_list,else_list,then_regvar_loaded_other,else_regvar_loaded_other);
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end;
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{ add all lists together }
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org_list.concatlist(then_list);
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then_list.free;
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org_list.concatlist(else_list);
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else_list.free;
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org_list.concatlist(current_asmdata.CurrAsmList);
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current_asmdata.CurrAsmList.free;
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current_asmdata.CurrAsmList := org_list;
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end;
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*)
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cg.executionweight:=oldexecutionweight;
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flowcontrol := oldflowcontrol + (flowcontrol - [fc_inflowcontrol]);
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end;
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{*****************************************************************************
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SecondFor
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*****************************************************************************}
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procedure tcgfornode.pass_generate_code;
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begin
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{ for nodes are converted in pass_1 in a while loop }
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internalerror(2015082501);
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end;
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{*****************************************************************************
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SecondExitN
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*****************************************************************************}
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procedure tcgexitnode.pass_generate_code;
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begin
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location_reset(location,LOC_VOID,OS_NO);
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include(flowcontrol,fc_exit);
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if assigned(left) then
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secondpass(left);
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if (fc_unwind_exit in flowcontrol) then
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hlcg.g_local_unwind(current_asmdata.CurrAsmList,current_procinfo.CurrExitLabel)
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else
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hlcg.a_jmp_always(current_asmdata.CurrAsmList,current_procinfo.CurrExitLabel);
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end;
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{*****************************************************************************
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SecondBreakN
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*****************************************************************************}
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procedure tcgbreaknode.pass_generate_code;
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begin
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location_reset(location,LOC_VOID,OS_NO);
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include(flowcontrol,fc_break);
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if current_procinfo.CurrBreakLabel<>nil then
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begin
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{$ifdef OLDREGVARS}
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load_all_regvars(current_asmdata.CurrAsmList);
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{$endif OLDREGVARS}
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if (fc_unwind_loop in flowcontrol) then
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hlcg.g_local_unwind(current_asmdata.CurrAsmList,current_procinfo.CurrBreakLabel)
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else
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hlcg.a_jmp_always(current_asmdata.CurrAsmList,current_procinfo.CurrBreakLabel)
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end
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else
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CGMessage(cg_e_break_not_allowed);
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end;
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|
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{*****************************************************************************
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SecondContinueN
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*****************************************************************************}
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procedure tcgcontinuenode.pass_generate_code;
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begin
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location_reset(location,LOC_VOID,OS_NO);
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include(flowcontrol,fc_continue);
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if current_procinfo.CurrContinueLabel<>nil then
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begin
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{$ifdef OLDREGVARS}
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load_all_regvars(current_asmdata.CurrAsmList);
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{$endif OLDREGVARS}
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if (fc_unwind_loop in flowcontrol) then
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hlcg.g_local_unwind(current_asmdata.CurrAsmList,current_procinfo.CurrContinueLabel)
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else
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hlcg.a_jmp_always(current_asmdata.CurrAsmList,current_procinfo.CurrContinueLabel)
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end
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else
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CGMessage(cg_e_continue_not_allowed);
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end;
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|
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{*****************************************************************************
|
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SecondGoto
|
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*****************************************************************************}
|
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procedure tcggotonode.pass_generate_code;
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begin
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location_reset(location,LOC_VOID,OS_NO);
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include(flowcontrol,fc_gotolabel);
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{$ifdef OLDREGVARS}
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load_all_regvars(current_asmdata.CurrAsmList);
|
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{$endif OLDREGVARS}
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hlcg.a_jmp_always(current_asmdata.CurrAsmList,tcglabelnode(labelnode).getasmlabel)
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end;
|
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|
|
|
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{*****************************************************************************
|
|
SecondLabel
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*****************************************************************************}
|
|
|
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function tcglabelnode.getasmlabel : tasmlabel;
|
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begin
|
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if not(assigned(asmlabel)) then
|
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{ labsym is not set in inlined procedures, but since assembler }
|
|
{ routines can't be inlined, that shouldn't matter }
|
|
if assigned(labsym) and
|
|
labsym.nonlocal then
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current_asmdata.getglobaljumplabel(asmlabel)
|
|
else
|
|
current_asmdata.getjumplabel(asmlabel);
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result:=asmlabel
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end;
|
|
|
|
|
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procedure tcglabelnode.pass_generate_code;
|
|
begin
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location_reset(location,LOC_VOID,OS_NO);
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|
|
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include(flowcontrol,fc_gotolabel);
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{$ifdef OLDREGVARS}
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load_all_regvars(current_asmdata.CurrAsmList);
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{$endif OLDREGVARS}
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hlcg.a_label(current_asmdata.CurrAsmList,getasmlabel);
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|
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{ Write also extra label if this label was referenced from
|
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assembler block }
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if assigned(labsym) and
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assigned(labsym.asmblocklabel) then
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hlcg.a_label(current_asmdata.CurrAsmList,labsym.asmblocklabel);
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|
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secondpass(left);
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end;
|
|
|
|
|
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{*****************************************************************************
|
|
SecondTryExcept
|
|
*****************************************************************************}
|
|
|
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var
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endexceptlabel : tasmlabel;
|
|
|
|
|
|
{ does the necessary things to clean up the object stack }
|
|
{ in the except block }
|
|
procedure cleanupobjectstack;
|
|
begin
|
|
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_doneexception',[],nil);
|
|
end;
|
|
|
|
{ generates code to be executed when another exeception is raised while
|
|
control is inside except block }
|
|
procedure handle_nested_exception(list:TAsmList;const t:texceptiontemps;entrylabel:TAsmLabel);
|
|
var
|
|
exitlabel: tasmlabel;
|
|
begin
|
|
{ don't generate line info for internal cleanup }
|
|
list.concat(tai_marker.create(mark_NoLineInfoStart));
|
|
current_asmdata.getjumplabel(exitlabel);
|
|
hlcg.a_label(list,entrylabel);
|
|
free_exception(list,t,0,exitlabel,false);
|
|
{ we don't need to save/restore registers here because reraise never }
|
|
{ returns }
|
|
hlcg.g_call_system_proc(list,'fpc_raise_nested',[],nil);
|
|
hlcg.a_label(list,exitlabel);
|
|
cleanupobjectstack;
|
|
end;
|
|
|
|
|
|
procedure tcgtryexceptnode.pass_generate_code;
|
|
|
|
var
|
|
exceptlabel,doexceptlabel,oldendexceptlabel,
|
|
lastonlabel,
|
|
exitexceptlabel,
|
|
continueexceptlabel,
|
|
breakexceptlabel,
|
|
exittrylabel,
|
|
continuetrylabel,
|
|
breaktrylabel,
|
|
doobjectdestroyandreraise,
|
|
oldCurrExitLabel,
|
|
oldContinueLabel,
|
|
oldBreakLabel : tasmlabel;
|
|
oldflowcontrol,tryflowcontrol,
|
|
exceptflowcontrol : tflowcontrol;
|
|
destroytemps,
|
|
excepttemps : texceptiontemps;
|
|
label
|
|
errorexit;
|
|
begin
|
|
location_reset(location,LOC_VOID,OS_NO);
|
|
exceptflowcontrol:=[];
|
|
continuetrylabel:=nil;
|
|
breaktrylabel:=nil;
|
|
continueexceptlabel:=nil;
|
|
breakexceptlabel:=nil;
|
|
|
|
oldflowcontrol:=flowcontrol;
|
|
flowcontrol:=[fc_inflowcontrol];
|
|
{ this can be called recursivly }
|
|
oldBreakLabel:=nil;
|
|
oldContinueLabel:=nil;
|
|
oldendexceptlabel:=endexceptlabel;
|
|
|
|
{ save the old labels for control flow statements }
|
|
oldCurrExitLabel:=current_procinfo.CurrExitLabel;
|
|
if assigned(current_procinfo.CurrBreakLabel) then
|
|
begin
|
|
oldContinueLabel:=current_procinfo.CurrContinueLabel;
|
|
oldBreakLabel:=current_procinfo.CurrBreakLabel;
|
|
end;
|
|
|
|
{ get new labels for the control flow statements }
|
|
current_asmdata.getjumplabel(exittrylabel);
|
|
current_asmdata.getjumplabel(exitexceptlabel);
|
|
if assigned(current_procinfo.CurrBreakLabel) then
|
|
begin
|
|
current_asmdata.getjumplabel(breaktrylabel);
|
|
current_asmdata.getjumplabel(continuetrylabel);
|
|
current_asmdata.getjumplabel(breakexceptlabel);
|
|
current_asmdata.getjumplabel(continueexceptlabel);
|
|
end;
|
|
|
|
current_asmdata.getjumplabel(exceptlabel);
|
|
current_asmdata.getjumplabel(doexceptlabel);
|
|
current_asmdata.getjumplabel(endexceptlabel);
|
|
current_asmdata.getjumplabel(lastonlabel);
|
|
|
|
get_exception_temps(current_asmdata.CurrAsmList,excepttemps);
|
|
new_exception(current_asmdata.CurrAsmList,excepttemps,exceptlabel);
|
|
|
|
{ try block }
|
|
{ set control flow labels for the try block }
|
|
current_procinfo.CurrExitLabel:=exittrylabel;
|
|
if assigned(oldBreakLabel) then
|
|
begin
|
|
current_procinfo.CurrContinueLabel:=continuetrylabel;
|
|
current_procinfo.CurrBreakLabel:=breaktrylabel;
|
|
end;
|
|
|
|
flowcontrol:=[fc_inflowcontrol];
|
|
secondpass(left);
|
|
tryflowcontrol:=flowcontrol;
|
|
if codegenerror then
|
|
goto errorexit;
|
|
|
|
{ don't generate line info for internal cleanup }
|
|
current_asmdata.CurrAsmList.concat(tai_marker.create(mark_NoLineInfoStart));
|
|
|
|
hlcg.a_label(current_asmdata.CurrAsmList,exceptlabel);
|
|
|
|
free_exception(current_asmdata.CurrAsmList, excepttemps, 0, endexceptlabel, false);
|
|
|
|
hlcg.a_label(current_asmdata.CurrAsmList,doexceptlabel);
|
|
|
|
{ end cleanup }
|
|
current_asmdata.CurrAsmList.concat(tai_marker.create(mark_NoLineInfoEnd));
|
|
|
|
{ set control flow labels for the except block }
|
|
{ and the on statements }
|
|
current_procinfo.CurrExitLabel:=exitexceptlabel;
|
|
if assigned(oldBreakLabel) then
|
|
begin
|
|
current_procinfo.CurrContinueLabel:=continueexceptlabel;
|
|
current_procinfo.CurrBreakLabel:=breakexceptlabel;
|
|
end;
|
|
|
|
flowcontrol:=[fc_inflowcontrol];
|
|
{ on statements }
|
|
if assigned(right) then
|
|
secondpass(right);
|
|
|
|
{ don't generate line info for internal cleanup }
|
|
current_asmdata.CurrAsmList.concat(tai_marker.create(mark_NoLineInfoStart));
|
|
|
|
hlcg.a_label(current_asmdata.CurrAsmList,lastonlabel);
|
|
{ default handling except handling }
|
|
if assigned(t1) then
|
|
begin
|
|
{ FPC_CATCHES with 'default handler' flag (=-1) need no longer be called,
|
|
it doesn't change any state and its return value is ignored (Sergei)
|
|
}
|
|
|
|
{ the destruction of the exception object must be also }
|
|
{ guarded by an exception frame, but it can be omitted }
|
|
{ if there's no user code in 'except' block }
|
|
|
|
if not (has_no_code(t1)) then
|
|
begin
|
|
current_asmdata.getjumplabel(doobjectdestroyandreraise);
|
|
|
|
get_exception_temps(current_asmdata.CurrAsmList,destroytemps);
|
|
new_exception(current_asmdata.CurrAsmList,destroytemps,doobjectdestroyandreraise);
|
|
|
|
{ except block needs line info }
|
|
current_asmdata.CurrAsmList.concat(tai_marker.create(mark_NoLineInfoEnd));
|
|
|
|
{ here we don't have to reset flowcontrol }
|
|
{ the default and on flowcontrols are handled equal }
|
|
secondpass(t1);
|
|
exceptflowcontrol:=flowcontrol;
|
|
|
|
handle_nested_exception(current_asmdata.CurrAsmList,destroytemps,doobjectdestroyandreraise);
|
|
|
|
unget_exception_temps(current_asmdata.CurrAsmList,destroytemps);
|
|
hlcg.a_jmp_always(current_asmdata.CurrAsmList,endexceptlabel);
|
|
end
|
|
else
|
|
begin
|
|
exceptflowcontrol:=flowcontrol;
|
|
cleanupobjectstack;
|
|
hlcg.a_jmp_always(current_asmdata.CurrAsmList,endexceptlabel);
|
|
end;
|
|
end
|
|
else
|
|
begin
|
|
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_reraise',[],nil);
|
|
exceptflowcontrol:=flowcontrol;
|
|
end;
|
|
|
|
if fc_exit in exceptflowcontrol then
|
|
begin
|
|
{ do some magic for exit in the try block }
|
|
hlcg.a_label(current_asmdata.CurrAsmList,exitexceptlabel);
|
|
{ we must also destroy the address frame which guards }
|
|
{ exception object }
|
|
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_popaddrstack',[],nil);
|
|
hlcg.g_exception_reason_discard(current_asmdata.CurrAsmList,osuinttype,excepttemps.reasonbuf);
|
|
cleanupobjectstack;
|
|
hlcg.a_jmp_always(current_asmdata.CurrAsmList,oldCurrExitLabel);
|
|
end;
|
|
|
|
if fc_break in exceptflowcontrol then
|
|
begin
|
|
hlcg.a_label(current_asmdata.CurrAsmList,breakexceptlabel);
|
|
{ we must also destroy the address frame which guards }
|
|
{ exception object }
|
|
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_popaddrstack',[],nil);
|
|
hlcg.g_exception_reason_discard(current_asmdata.CurrAsmList,osuinttype,excepttemps.reasonbuf);
|
|
cleanupobjectstack;
|
|
cg.a_jmp_always(current_asmdata.CurrAsmList,oldBreakLabel);
|
|
end;
|
|
|
|
if fc_continue in exceptflowcontrol then
|
|
begin
|
|
hlcg.a_label(current_asmdata.CurrAsmList,continueexceptlabel);
|
|
{ we must also destroy the address frame which guards }
|
|
{ exception object }
|
|
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_popaddrstack',[],nil);
|
|
hlcg.g_exception_reason_discard(current_asmdata.CurrAsmList,osuinttype,excepttemps.reasonbuf);
|
|
cleanupobjectstack;
|
|
hlcg.a_jmp_always(current_asmdata.CurrAsmList,oldContinueLabel);
|
|
end;
|
|
|
|
if fc_exit in tryflowcontrol then
|
|
begin
|
|
{ do some magic for exit in the try block }
|
|
hlcg.a_label(current_asmdata.CurrAsmList,exittrylabel);
|
|
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_popaddrstack',[],nil);
|
|
hlcg.g_exception_reason_discard(current_asmdata.CurrAsmList,osuinttype,excepttemps.reasonbuf);
|
|
hlcg.a_jmp_always(current_asmdata.CurrAsmList,oldCurrExitLabel);
|
|
end;
|
|
|
|
if fc_break in tryflowcontrol then
|
|
begin
|
|
hlcg.a_label(current_asmdata.CurrAsmList,breaktrylabel);
|
|
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_popaddrstack',[],nil);
|
|
hlcg.g_exception_reason_discard(current_asmdata.CurrAsmList,osuinttype,excepttemps.reasonbuf);
|
|
cg.a_jmp_always(current_asmdata.CurrAsmList,oldBreakLabel);
|
|
end;
|
|
|
|
if fc_continue in tryflowcontrol then
|
|
begin
|
|
hlcg.a_label(current_asmdata.CurrAsmList,continuetrylabel);
|
|
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_popaddrstack',[],nil);
|
|
hlcg.g_exception_reason_discard(current_asmdata.CurrAsmList,osuinttype,excepttemps.reasonbuf);
|
|
cg.a_jmp_always(current_asmdata.CurrAsmList,oldContinueLabel);
|
|
end;
|
|
unget_exception_temps(current_asmdata.CurrAsmList,excepttemps);
|
|
hlcg.a_label(current_asmdata.CurrAsmList,endexceptlabel);
|
|
|
|
{ end cleanup }
|
|
current_asmdata.CurrAsmList.concat(tai_marker.create(mark_NoLineInfoEnd));
|
|
|
|
errorexit:
|
|
{ restore all saved labels }
|
|
endexceptlabel:=oldendexceptlabel;
|
|
|
|
{ restore the control flow labels }
|
|
current_procinfo.CurrExitLabel:=oldCurrExitLabel;
|
|
if assigned(oldBreakLabel) then
|
|
begin
|
|
current_procinfo.CurrContinueLabel:=oldContinueLabel;
|
|
current_procinfo.CurrBreakLabel:=oldBreakLabel;
|
|
end;
|
|
|
|
{ return all used control flow statements }
|
|
flowcontrol:=oldflowcontrol+(exceptflowcontrol +
|
|
tryflowcontrol - [fc_inflowcontrol]);
|
|
end;
|
|
|
|
|
|
procedure tcgonnode.pass_generate_code;
|
|
var
|
|
nextonlabel,
|
|
exitonlabel,
|
|
continueonlabel,
|
|
breakonlabel,
|
|
oldCurrExitLabel,
|
|
oldContinueLabel,
|
|
doobjectdestroyandreraise,
|
|
oldBreakLabel : tasmlabel;
|
|
oldflowcontrol : tflowcontrol;
|
|
excepttemps : texceptiontemps;
|
|
href2: treference;
|
|
paraloc1 : tcgpara;
|
|
exceptvarsym : tlocalvarsym;
|
|
pd : tprocdef;
|
|
fpc_catches_res: TCGPara;
|
|
fpc_catches_resloc: tlocation;
|
|
otherunit,
|
|
indirect : boolean;
|
|
begin
|
|
paraloc1.init;
|
|
location_reset(location,LOC_VOID,OS_NO);
|
|
oldCurrExitLabel:=nil;
|
|
continueonlabel:=nil;
|
|
breakonlabel:=nil;
|
|
exitonlabel:=nil;
|
|
|
|
oldflowcontrol:=flowcontrol;
|
|
flowcontrol:=[fc_inflowcontrol];
|
|
current_asmdata.getjumplabel(nextonlabel);
|
|
|
|
otherunit:=findunitsymtable(excepttype.owner).moduleid<>findunitsymtable(current_procinfo.procdef.owner).moduleid;
|
|
indirect:=(tf_supports_packages in target_info.flags) and
|
|
(target_info.system in systems_indirect_var_imports) and
|
|
(cs_imported_data in current_settings.localswitches) and
|
|
otherunit;
|
|
|
|
{ send the vmt parameter }
|
|
pd:=search_system_proc('fpc_catches');
|
|
reference_reset_symbol(href2,current_asmdata.RefAsmSymbol(excepttype.vmt_mangledname,AT_DATA,indirect),0,sizeof(pint),[]);
|
|
if otherunit then
|
|
current_module.add_extern_asmsym(excepttype.vmt_mangledname,AB_EXTERNAL,AT_DATA);
|
|
paramanager.getintparaloc(current_asmdata.CurrAsmList,pd,1,paraloc1);
|
|
hlcg.a_loadaddr_ref_cgpara(current_asmdata.CurrAsmList,excepttype.vmt_def,href2,paraloc1);
|
|
paramanager.freecgpara(current_asmdata.CurrAsmList,paraloc1);
|
|
fpc_catches_res:=hlcg.g_call_system_proc(current_asmdata.CurrAsmList,pd,[@paraloc1],nil);
|
|
location_reset(fpc_catches_resloc,LOC_REGISTER,def_cgsize(fpc_catches_res.def));
|
|
fpc_catches_resloc.register:=hlcg.getaddressregister(current_asmdata.CurrAsmList,fpc_catches_res.def);
|
|
hlcg.gen_load_cgpara_loc(current_asmdata.CurrAsmList,fpc_catches_res.def,fpc_catches_res,fpc_catches_resloc,true);
|
|
|
|
{ is it this catch? No. go to next onlabel }
|
|
hlcg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,fpc_catches_res.def,OC_EQ,0,fpc_catches_resloc.register,nextonlabel);
|
|
|
|
{ Retrieve exception variable }
|
|
if assigned(excepTSymtable) then
|
|
exceptvarsym:=tlocalvarsym(excepTSymtable.SymList[0])
|
|
else
|
|
internalerror(2011020401);
|
|
|
|
if assigned(exceptvarsym) then
|
|
begin
|
|
location_reset_ref(exceptvarsym.localloc,LOC_REFERENCE,def_cgsize(voidpointertype),voidpointertype.alignment,[]);
|
|
tg.GetLocal(current_asmdata.CurrAsmList,exceptvarsym.vardef.size,exceptvarsym.vardef,exceptvarsym.localloc.reference);
|
|
hlcg.a_load_reg_ref(current_asmdata.CurrAsmList,fpc_catches_res.def,exceptvarsym.vardef,fpc_catches_resloc.register,exceptvarsym.localloc.reference);
|
|
end;
|
|
|
|
{ in the case that another exception is risen
|
|
we've to destroy the old one }
|
|
current_asmdata.getjumplabel(doobjectdestroyandreraise);
|
|
|
|
{ call setjmp, and jump to finally label on non-zero result }
|
|
get_exception_temps(current_asmdata.CurrAsmList,excepttemps);
|
|
new_exception(current_asmdata.CurrAsmList,excepttemps,doobjectdestroyandreraise);
|
|
|
|
oldBreakLabel:=nil;
|
|
oldContinueLabel:=nil;
|
|
if assigned(right) then
|
|
begin
|
|
oldCurrExitLabel:=current_procinfo.CurrExitLabel;
|
|
current_asmdata.getjumplabel(exitonlabel);
|
|
current_procinfo.CurrExitLabel:=exitonlabel;
|
|
if assigned(current_procinfo.CurrBreakLabel) then
|
|
begin
|
|
oldContinueLabel:=current_procinfo.CurrContinueLabel;
|
|
oldBreakLabel:=current_procinfo.CurrBreakLabel;
|
|
current_asmdata.getjumplabel(breakonlabel);
|
|
current_asmdata.getjumplabel(continueonlabel);
|
|
current_procinfo.CurrContinueLabel:=continueonlabel;
|
|
current_procinfo.CurrBreakLabel:=breakonlabel;
|
|
end;
|
|
|
|
secondpass(right);
|
|
end;
|
|
|
|
handle_nested_exception(current_asmdata.CurrAsmList,excepttemps,doobjectdestroyandreraise);
|
|
|
|
{ clear some stuff }
|
|
if assigned(exceptvarsym) then
|
|
begin
|
|
tg.UngetLocal(current_asmdata.CurrAsmList,exceptvarsym.localloc.reference);
|
|
exceptvarsym.localloc.loc:=LOC_INVALID;
|
|
end;
|
|
cg.a_jmp_always(current_asmdata.CurrAsmList,endexceptlabel);
|
|
|
|
if assigned(right) then
|
|
begin
|
|
{ special handling for control flow instructions }
|
|
if fc_exit in flowcontrol then
|
|
begin
|
|
{ the address and object pop does secondtryexcept }
|
|
cg.a_label(current_asmdata.CurrAsmList,exitonlabel);
|
|
cg.a_jmp_always(current_asmdata.CurrAsmList,oldCurrExitLabel);
|
|
end;
|
|
|
|
if fc_break in flowcontrol then
|
|
begin
|
|
{ the address and object pop does secondtryexcept }
|
|
cg.a_label(current_asmdata.CurrAsmList,breakonlabel);
|
|
cg.a_jmp_always(current_asmdata.CurrAsmList,oldBreakLabel);
|
|
end;
|
|
|
|
if fc_continue in flowcontrol then
|
|
begin
|
|
{ the address and object pop does secondtryexcept }
|
|
cg.a_label(current_asmdata.CurrAsmList,continueonlabel);
|
|
cg.a_jmp_always(current_asmdata.CurrAsmList,oldContinueLabel);
|
|
end;
|
|
|
|
current_procinfo.CurrExitLabel:=oldCurrExitLabel;
|
|
if assigned(oldBreakLabel) then
|
|
begin
|
|
current_procinfo.CurrContinueLabel:=oldContinueLabel;
|
|
current_procinfo.CurrBreakLabel:=oldBreakLabel;
|
|
end;
|
|
end;
|
|
|
|
unget_exception_temps(current_asmdata.CurrAsmList,excepttemps);
|
|
cg.a_label(current_asmdata.CurrAsmList,nextonlabel);
|
|
flowcontrol:=oldflowcontrol+(flowcontrol-[fc_inflowcontrol]);
|
|
paraloc1.done;
|
|
current_asmdata.CurrAsmList.concat(tai_marker.create(mark_NoLineInfoEnd));
|
|
|
|
{ next on node }
|
|
if assigned(left) then
|
|
secondpass(left);
|
|
end;
|
|
|
|
{*****************************************************************************
|
|
SecondTryFinally
|
|
*****************************************************************************}
|
|
|
|
procedure tcgtryfinallynode.handle_safecall_exception;
|
|
var
|
|
cgpara: tcgpara;
|
|
selfsym: tparavarsym;
|
|
pd: tprocdef;
|
|
begin
|
|
{ call fpc_safecallhandler, passing self for methods of classes,
|
|
nil otherwise. }
|
|
pd:=search_system_proc('fpc_safecallhandler');
|
|
cgpara.init;
|
|
paramanager.getintparaloc(current_asmdata.CurrAsmList,pd,1,cgpara);
|
|
if is_class(current_procinfo.procdef.struct) then
|
|
begin
|
|
selfsym:=tparavarsym(current_procinfo.procdef.parast.Find('self'));
|
|
if (selfsym=nil) or (selfsym.typ<>paravarsym) then
|
|
InternalError(2011123101);
|
|
cg.a_load_loc_cgpara(current_asmdata.CurrAsmList,selfsym.localloc,cgpara);
|
|
end
|
|
else
|
|
cg.a_load_const_cgpara(current_asmdata.CurrAsmList,OS_ADDR,0,cgpara);
|
|
paramanager.freecgpara(current_asmdata.CurrAsmList,cgpara);
|
|
cgpara.done;
|
|
cg.g_call(current_asmdata.CurrAsmList,'FPC_SAFECALLHANDLER');
|
|
cg.a_load_reg_reg(current_asmdata.CurrAsmList,OS_INT,OS_INT,NR_FUNCTION_RESULT_REG, NR_FUNCTION_RETURN_REG);
|
|
end;
|
|
|
|
procedure tcgtryfinallynode.pass_generate_code;
|
|
var
|
|
finallylabel,
|
|
endfinallylabel,
|
|
exitfinallylabel,
|
|
continuefinallylabel,
|
|
breakfinallylabel,
|
|
oldCurrExitLabel,
|
|
oldContinueLabel,
|
|
oldBreakLabel : tasmlabel;
|
|
oldflowcontrol,tryflowcontrol : tflowcontrol;
|
|
excepttemps : texceptiontemps;
|
|
reasonreg : tregister;
|
|
begin
|
|
location_reset(location,LOC_VOID,OS_NO);
|
|
tryflowcontrol:=[];
|
|
oldBreakLabel:=nil;
|
|
oldContinueLabel:=nil;
|
|
continuefinallylabel:=nil;
|
|
breakfinallylabel:=nil;
|
|
|
|
{ check if child nodes do a break/continue/exit }
|
|
oldflowcontrol:=flowcontrol;
|
|
flowcontrol:=[fc_inflowcontrol];
|
|
current_asmdata.getjumplabel(finallylabel);
|
|
current_asmdata.getjumplabel(endfinallylabel);
|
|
|
|
{ the finally block must catch break, continue and exit }
|
|
{ statements }
|
|
oldCurrExitLabel:=current_procinfo.CurrExitLabel;
|
|
if implicitframe then
|
|
exitfinallylabel:=finallylabel
|
|
else
|
|
current_asmdata.getjumplabel(exitfinallylabel);
|
|
current_procinfo.CurrExitLabel:=exitfinallylabel;
|
|
if assigned(current_procinfo.CurrBreakLabel) then
|
|
begin
|
|
oldContinueLabel:=current_procinfo.CurrContinueLabel;
|
|
oldBreakLabel:=current_procinfo.CurrBreakLabel;
|
|
if implicitframe then
|
|
begin
|
|
breakfinallylabel:=finallylabel;
|
|
continuefinallylabel:=finallylabel;
|
|
end
|
|
else
|
|
begin
|
|
current_asmdata.getjumplabel(breakfinallylabel);
|
|
current_asmdata.getjumplabel(continuefinallylabel);
|
|
end;
|
|
current_procinfo.CurrContinueLabel:=continuefinallylabel;
|
|
current_procinfo.CurrBreakLabel:=breakfinallylabel;
|
|
end;
|
|
|
|
{ call setjmp, and jump to finally label on non-zero result }
|
|
get_exception_temps(current_asmdata.CurrAsmList,excepttemps);
|
|
new_exception(current_asmdata.CurrAsmList,excepttemps,finallylabel);
|
|
|
|
{ try code }
|
|
if assigned(left) then
|
|
begin
|
|
secondpass(left);
|
|
tryflowcontrol:=flowcontrol;
|
|
if codegenerror then
|
|
exit;
|
|
end;
|
|
|
|
{ don't generate line info for internal cleanup }
|
|
current_asmdata.CurrAsmList.concat(tai_marker.create(mark_NoLineInfoStart));
|
|
|
|
hlcg.a_label(current_asmdata.CurrAsmList,finallylabel);
|
|
{ just free the frame information }
|
|
free_exception(current_asmdata.CurrAsmList,excepttemps,1,finallylabel,true);
|
|
|
|
{ end cleanup }
|
|
current_asmdata.CurrAsmList.concat(tai_marker.create(mark_NoLineInfoEnd));
|
|
|
|
{ finally code }
|
|
flowcontrol:=[fc_inflowcontrol];
|
|
secondpass(right);
|
|
{ goto is allowed if it stays inside the finally block,
|
|
this is checked using the exception block number }
|
|
if (flowcontrol-[fc_gotolabel])<>[fc_inflowcontrol] then
|
|
CGMessage(cg_e_control_flow_outside_finally);
|
|
if codegenerror then
|
|
exit;
|
|
|
|
{ don't generate line info for internal cleanup }
|
|
current_asmdata.CurrAsmList.concat(tai_marker.create(mark_NoLineInfoStart));
|
|
|
|
{ the value should now be in the exception handler }
|
|
reasonreg:=hlcg.getintregister(current_asmdata.CurrAsmList,osuinttype);
|
|
hlcg.g_exception_reason_load(current_asmdata.CurrAsmList,osuinttype,osuinttype,excepttemps.reasonbuf,reasonreg);
|
|
if implicitframe then
|
|
begin
|
|
hlcg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,osuinttype,OC_EQ,0,reasonreg,endfinallylabel);
|
|
{ finally code only needed to be executed on exception }
|
|
flowcontrol:=[fc_inflowcontrol];
|
|
secondpass(t1);
|
|
if flowcontrol<>[fc_inflowcontrol] then
|
|
CGMessage(cg_e_control_flow_outside_finally);
|
|
if codegenerror then
|
|
exit;
|
|
if (tf_safecall_exceptions in target_info.flags) and
|
|
(current_procinfo.procdef.proccalloption=pocall_safecall) then
|
|
handle_safecall_exception
|
|
else
|
|
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_reraise',[],nil);
|
|
end
|
|
else
|
|
begin
|
|
hlcg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,osuinttype,OC_EQ,0,reasonreg,endfinallylabel);
|
|
if fc_exit in tryflowcontrol then
|
|
hlcg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,osuinttype,OC_EQ,2,reasonreg,oldCurrExitLabel);
|
|
if fc_break in tryflowcontrol then
|
|
hlcg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,osuinttype,OC_EQ,3,reasonreg,oldBreakLabel);
|
|
if fc_continue in tryflowcontrol then
|
|
hlcg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,osuinttype,OC_EQ,4,reasonreg,oldContinueLabel);
|
|
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_reraise',[],nil);
|
|
{ do some magic for exit,break,continue in the try block }
|
|
if fc_exit in tryflowcontrol then
|
|
begin
|
|
hlcg.a_label(current_asmdata.CurrAsmList,exitfinallylabel);
|
|
hlcg.g_exception_reason_discard(current_asmdata.CurrAsmList,osuinttype,excepttemps.reasonbuf);
|
|
hlcg.g_exception_reason_save_const(current_asmdata.CurrAsmList,osuinttype,2,excepttemps.reasonbuf);
|
|
hlcg.a_jmp_always(current_asmdata.CurrAsmList,finallylabel);
|
|
end;
|
|
if fc_break in tryflowcontrol then
|
|
begin
|
|
hlcg.a_label(current_asmdata.CurrAsmList,breakfinallylabel);
|
|
hlcg.g_exception_reason_discard(current_asmdata.CurrAsmList,osuinttype,excepttemps.reasonbuf);
|
|
hlcg.g_exception_reason_save_const(current_asmdata.CurrAsmList,osuinttype,3,excepttemps.reasonbuf);
|
|
hlcg.a_jmp_always(current_asmdata.CurrAsmList,finallylabel);
|
|
end;
|
|
if fc_continue in tryflowcontrol then
|
|
begin
|
|
hlcg.a_label(current_asmdata.CurrAsmList,continuefinallylabel);
|
|
hlcg.g_exception_reason_discard(current_asmdata.CurrAsmList,osuinttype,excepttemps.reasonbuf);
|
|
hlcg.g_exception_reason_save_const(current_asmdata.CurrAsmList,osuinttype,4,excepttemps.reasonbuf);
|
|
hlcg.a_jmp_always(current_asmdata.CurrAsmList,finallylabel);
|
|
end;
|
|
end;
|
|
unget_exception_temps(current_asmdata.CurrAsmList,excepttemps);
|
|
hlcg.a_label(current_asmdata.CurrAsmList,endfinallylabel);
|
|
|
|
{ end cleanup }
|
|
current_asmdata.CurrAsmList.concat(tai_marker.create(mark_NoLineInfoEnd));
|
|
|
|
current_procinfo.CurrExitLabel:=oldCurrExitLabel;
|
|
if assigned(current_procinfo.CurrBreakLabel) then
|
|
begin
|
|
current_procinfo.CurrContinueLabel:=oldContinueLabel;
|
|
current_procinfo.CurrBreakLabel:=oldBreakLabel;
|
|
end;
|
|
flowcontrol:=oldflowcontrol+(tryflowcontrol-[fc_inflowcontrol]);
|
|
end;
|
|
|
|
|
|
begin
|
|
cwhilerepeatnode:=tcgwhilerepeatnode;
|
|
cifnode:=tcgifnode;
|
|
cfornode:=tcgfornode;
|
|
cexitnode:=tcgexitnode;
|
|
cbreaknode:=tcgbreaknode;
|
|
ccontinuenode:=tcgcontinuenode;
|
|
cgotonode:=tcggotonode;
|
|
clabelnode:=tcglabelnode;
|
|
craisenode:=tcgraisenode;
|
|
ctryexceptnode:=tcgtryexceptnode;
|
|
ctryfinallynode:=tcgtryfinallynode;
|
|
connode:=tcgonnode;
|
|
end.
|
|
|