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+ exception cleanup when break, continue or exit is used inside a

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try .. except 'on' block, in WebAssembly native exceptions mode
This commit is contained in:
Nikolay Nikolov 2021-10-05 06:45:31 +03:00
parent cf7ad98dbf
commit 023f08d54b
1 changed files with 101 additions and 1 deletions
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102
compiler/wasm32/nwasmflw.pas
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@ -1355,9 +1355,32 @@ implementation
exceptvarsym : tlocalvarsym;
exceptlocdef: tdef;
exceptlocreg: tregister;
oldCurrExitLabel,
oldContinueLabel,
oldBreakLabel: tasmlabel;
oldLoopContBr: integer;
oldLoopBreakBr: integer;
oldExitBr: integer;
in_loop: Boolean;
doobjectdestroyandreraisestate: tcgexceptionstatehandler.texceptionstate;
excepttemps: tcgexceptionstatehandler.texceptiontemps;
begin
oldCurrExitLabel:=nil;
oldContinueLabel:=nil;
oldBreakLabel:=nil;
oldLoopContBr:=0;
oldLoopBreakBr:=0;
oldExitBr:=0;
location_reset(location,LOC_VOID,OS_NO);
{ Exception temps? We don't need no stinking exception temps! :) }
fillchar(excepttemps,sizeof(excepttemps),0);
reference_reset(excepttemps.envbuf,0,[]);
reference_reset(excepttemps.jmpbuf,0,[]);
reference_reset(excepttemps.reasonbuf,0,[]);
in_loop:=assigned(current_procinfo.CurrBreakLabel);
cexceptionstatehandler.begin_catch(current_asmdata.CurrAsmList,excepttype,nil,exceptlocdef,exceptlocreg);
{ Retrieve exception variable }
@ -1373,17 +1396,91 @@ implementation
hlcg.a_load_reg_ref(current_asmdata.CurrAsmList, exceptlocdef, exceptvarsym.vardef, exceptlocreg, exceptvarsym.localloc.reference);
end;
cexceptionstatehandler.new_exception(current_asmdata.CurrAsmList,excepttemps,tek_except,doobjectdestroyandreraisestate);
{ in the case that another exception is risen
we've to destroy the old one, so create a new
exception frame for the catch-handler }
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_try));
thlcgwasm(hlcg).incblock;
{ the 'exit' block }
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_block));
thlcgwasm(hlcg).incblock;
oldCurrExitLabel:=current_procinfo.CurrExitLabel;
oldExitBr:=thlcgwasm(hlcg).exitBr;
current_asmdata.getjumplabel(current_procinfo.CurrExitLabel);
thlcgwasm(hlcg).exitBr:=thlcgwasm(hlcg).br_blocks;
{ the 'break' block }
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_block));
thlcgwasm(hlcg).incblock;
if in_loop then
begin
oldBreakLabel:=current_procinfo.CurrBreakLabel;
oldLoopBreakBr:=thlcgwasm(hlcg).loopBreakBr;
current_asmdata.getjumplabel(current_procinfo.CurrBreakLabel);
thlcgwasm(hlcg).loopBreakBr:=thlcgwasm(hlcg).br_blocks;
end;
{ the 'continue' block }
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_block));
thlcgwasm(hlcg).incblock;
if in_loop then
begin
oldContinueLabel:=current_procinfo.CurrContinueLabel;
oldLoopContBr:=thlcgwasm(hlcg).loopContBr;
current_asmdata.getjumplabel(current_procinfo.CurrContinueLabel);
thlcgwasm(hlcg).loopContBr:=thlcgwasm(hlcg).br_blocks;
end;
if assigned(right) then
secondpass(right);
cexceptionstatehandler.end_try_block(current_asmdata.CurrAsmList,tek_except,excepttemps,doobjectdestroyandreraisestate,nil);
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_doneexception',[],nil).resetiftemp;
current_asmdata.CurrAsmList.concat(taicpu.op_const(a_br,2));
current_asmdata.CurrAsmList.concat(taicpu.op_const(a_br,5));
{ exit the 'continue' block }
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_end_block));
thlcgwasm(hlcg).decblock;
if fc_continue in doobjectdestroyandreraisestate.newflowcontrol then
begin
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_doneexception',[],nil).resetiftemp;
current_asmdata.CurrAsmList.concat(taicpu.op_const(a_br,thlcgwasm(hlcg).br_blocks-oldLoopContBr));
end;
{ exit the 'break' block }
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_end_block)); // break
thlcgwasm(hlcg).decblock;
if fc_break in doobjectdestroyandreraisestate.newflowcontrol then
begin
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_doneexception',[],nil).resetiftemp;
current_asmdata.CurrAsmList.concat(taicpu.op_const(a_br,thlcgwasm(hlcg).br_blocks-oldLoopBreakBr));
end;
{ exit the 'exit' block }
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_end_block)); // exit
thlcgwasm(hlcg).decblock;
if fc_exit in doobjectdestroyandreraisestate.newflowcontrol then
begin
hlcg.g_call_system_proc(current_asmdata.CurrAsmList,'fpc_doneexception',[],nil).resetiftemp;
current_asmdata.CurrAsmList.concat(taicpu.op_const(a_br,thlcgwasm(hlcg).br_blocks-oldExitBr));
end;
current_procinfo.CurrExitLabel:=oldCurrExitLabel;
thlcgwasm(hlcg).exitBr:=oldExitBr;
if in_loop then
begin
current_procinfo.CurrContinueLabel:=oldContinueLabel;
thlcgwasm(hlcg).loopContBr:=oldLoopContBr;
current_procinfo.CurrBreakLabel:=oldBreakLabel;
thlcgwasm(hlcg).loopBreakBr:=oldLoopBreakBr;
end;
current_asmdata.CurrAsmList.concat(taicpu.op_sym(a_catch,current_asmdata.WeakRefAsmSymbol(FPC_EXCEPTION_TAG_SYM,AT_WASM_EXCEPTION_TAG)));
@ -1400,6 +1497,9 @@ implementation
end;
cexceptionstatehandler.end_catch(current_asmdata.CurrAsmList);
{ propagate exit/break/continue }
flowcontrol:=doobjectdestroyandreraisestate.oldflowcontrol+(doobjectdestroyandreraisestate.newflowcontrol-[fc_inflowcontrol,fc_catching_exceptions]);
{ next on node }
if assigned(left) then
secondpass(left);