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+ added label resolution via state machine

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This commit is contained in:
Nikolay Nikolov 2023-10-21 23:33:09 +03:00
parent fc9719f5f9
commit f9ecc12e5b
1 changed files with 100 additions and 1 deletions
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101
compiler/wasm32/cpupi.pas
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@ -63,7 +63,7 @@ implementation
uses
systems,verbose,globals,tgcpu,cgexcept,
tgobj,paramgr,symconst,symdef,symtable,symcpu,cgutils,pass_2,parabase,
fmodule,hlcgobj,hlcgcpu,defutil;
fmodule,hlcgobj,hlcgcpu,defutil,itcpugas;
{*****************************************************************************
twasmexceptionstatehandler_noexceptions
@ -670,6 +670,104 @@ implementation
result:=resolve_labels_pass2(asmlist);
end;
procedure resolve_labels_via_state_machine(asmlist: TAsmList);
var
blocks: TFPHashObjectList;
curr_block, tmplist: TAsmList;
hp, hpnext: tai;
block_nr, machine_state, target_block_index: Integer;
state_machine_loop_start_label, state_machine_exit: TAsmLabel;
begin
blocks:=TFPHashObjectList.Create;
curr_block:=TAsmList.Create;
blocks.Add('.start',curr_block);
repeat
hp:=tai(asmlist.First);
if assigned(hp) then
begin
asmlist.Remove(hp);
if hp.typ=ait_label then
begin
curr_block:=TAsmList.Create;
blocks.Add(tai_label(hp).labsym.Name,curr_block);
end;
curr_block.Concat(hp);
end;
until not assigned(hp);
{ asmlist is now empty }
asmlist.Concat(tai_comment.Create(strpnew('labels resolved via state machine')));
machine_state:=AllocWasmLocal(wbt_i32);
asmlist.Concat(tai_comment.Create(strpnew('machine state is in local '+tostr(machine_state))));
asmlist.Concat(taicpu.op_const(a_i32_const,0));
asmlist.Concat(taicpu.op_const(a_local_set,machine_state));
asmlist.Concat(taicpu.op_none(a_block));
asmlist.Concat(taicpu.op_none(a_loop));
current_asmdata.getjumplabel(state_machine_loop_start_label);
asmlist.concat(tai_label.create(state_machine_loop_start_label));
current_asmdata.getjumplabel(state_machine_exit);
for block_nr:=0 to blocks.Count-1 do
asmlist.Concat(taicpu.op_none(a_block));
for block_nr:=0 to blocks.Count-1 do
begin
{ TODO: this sequence can be replaced with a single br_table instruction }
asmlist.Concat(taicpu.op_const(a_local_get,machine_state));
asmlist.Concat(taicpu.op_const(a_i32_const,block_nr));
asmlist.Concat(taicpu.op_none(a_i32_eq));
asmlist.Concat(taicpu.op_const(a_br_if,blocks.Count-block_nr-1));
end;
asmlist.Concat(taicpu.op_none(a_unreachable));
tmplist:=TAsmList.Create;
for block_nr:=0 to blocks.Count-1 do
begin
asmlist.Concat(taicpu.op_none(a_end_block));
asmlist.Concat(tai_comment.Create(strpnew('block '+tostr(block_nr)+' for label '+blocks.NameOfIndex(block_nr))));
curr_block:=TAsmList(blocks[block_nr]);
hp:=tai(curr_block.First);
while assigned(hp) do
begin
hpnext:=tai(hp.next);
if (hp.typ=ait_instruction) and (taicpu(hp).opcode in [a_br,a_br_if]) and
(taicpu(hp).ops=1) and
(taicpu(hp).oper[0]^.typ=top_ref) and
assigned(taicpu(hp).oper[0]^.ref^.symbol) then
begin
target_block_index:=blocks.FindIndexOf(taicpu(hp).oper[0]^.ref^.symbol.Name);
curr_block.InsertBefore(tai_comment.Create(strpnew(
'branch '+gas_op2str[taicpu(hp).opcode]+
' '+taicpu(hp).oper[0]^.ref^.symbol.Name+
' target_block_index='+tostr(target_block_index))),hp);
if target_block_index<>-1 then
begin
tmplist.Clear;
if taicpu(hp).opcode=a_br_if then
tmplist.Concat(taicpu.op_none(a_if));
tmplist.Concat(taicpu.op_const(a_i32_const,target_block_index));
tmplist.Concat(taicpu.op_const(a_local_set,machine_state));
tmplist.Concat(taicpu.op_sym(a_br,state_machine_loop_start_label));
if taicpu(hp).opcode=a_br_if then
tmplist.Concat(taicpu.op_none(a_end_if));
curr_block.insertListAfter(hp,tmplist);
curr_block.Remove(hp);
end;
end;
hp:=hpnext;
end;
if block_nr<(blocks.Count-1) then
begin
curr_block.Concat(taicpu.op_const(a_i32_const,block_nr+1));
curr_block.Concat(taicpu.op_const(a_local_set,machine_state));
curr_block.Concat(taicpu.op_sym(a_br,state_machine_loop_start_label));
end
else
curr_block.Concat(taicpu.op_sym(a_br,state_machine_exit));
asmlist.concatList(curr_block);
end;
tmplist.Free;
asmlist.Concat(taicpu.op_none(a_end_loop));
asmlist.Concat(taicpu.op_none(a_end_block));
asmlist.concat(tai_label.create(state_machine_exit));
end;
procedure resolve_labels_complex(var asmlist: TAsmList);
var
l2: TAsmList;
@ -689,6 +787,7 @@ implementation
asmlist:=l2;
map_structured_asmlist(asmlist,@StripBlockInstructions);
resolve_labels_via_state_machine(asmlist);
end;
function prepare_locals: TAsmList;