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{
Copyright (c) 2019 by Dmitry Boyarintsev
Generate assembler for nodes that influence the flow for the JVM
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit nwasmflw;
{$i fpcdefs.inc}
interface
uses
aasmbase,node,nflw,ncgflw, cutils;
type
{ twasmifnode }
{ Wasm doesn't have any jump(+offset) operations
It only provide structured blockes to handle jumps
(It's possible to jump-out-of-block at any time)
"If" is also implemented as a block, identical to high-level language. }
twasmifnode = class(tcgifnode)
public
procedure pass_generate_code;override;
end;
{ twasmwhilerepeatnode }
twasmwhilerepeatnode = class(tcgwhilerepeatnode)
public
procedure pass_generate_code_condition;
procedure pass_generate_code;override;
end;
{ twasmtryexceptnode }
twasmtryexceptnode = class(tcgtryexceptnode)
public
procedure pass_generate_code;override;
end;
{ twasmtryfinallynode }
twasmtryfinallynode = class(tcgtryfinallynode)
public
procedure pass_generate_code;override;
end;
implementation
uses
verbose,globals,systems,globtype,constexp,
symconst,symdef,symsym,aasmtai,aasmdata,aasmcpu,defutil,defcmp,
procinfo,cgbase,pass_1,pass_2,parabase,
cpubase,cpuinfo,
nbas,nld,ncon,ncnv,
tgobj,paramgr,
cgutils,hlcgobj,hlcgcpu;
{*****************************************************************************
twasmwhilerepeatnode
*****************************************************************************}
procedure twasmwhilerepeatnode.pass_generate_code_condition;
begin
secondpass(left);
thlcgwasm(hlcg).a_load_loc_stack(current_asmdata.CurrAsmList,left.resultdef,left.location);
// reversing the condition
if not (lnf_checknegate in loopflags) then
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_i32_eqz));
current_asmdata.CurrAsmList.concat(taicpu.op_const(a_br_if,1) );
thlcgwasm(hlcg).decstack(current_asmdata.CurrAsmList,1);
end;
procedure twasmwhilerepeatnode.pass_generate_code;
var
lcont,lbreak,lloop,
oldclabel,oldblabel : tasmlabel;
truelabel,falselabel : tasmlabel;
oldflowcontrol : tflowcontrol;
oldloopcontbroffset: Integer;
oldloopbreakbroffset: Integer;
begin
location_reset(location,LOC_VOID,OS_NO);
current_asmdata.getjumplabel(lloop);
current_asmdata.getjumplabel(lcont);
current_asmdata.getjumplabel(lbreak);
oldflowcontrol:=flowcontrol;
oldloopcontbroffset:=thlcgwasm(hlcg).loopContBr;
oldloopbreakbroffset:=thlcgwasm(hlcg).loopBreakBr;
oldclabel:=current_procinfo.CurrContinueLabel;
oldblabel:=current_procinfo.CurrBreakLabel;
include(flowcontrol,fc_inflowcontrol);
exclude(flowcontrol,fc_unwind_loop);
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_block));
thlcgwasm(hlcg).incblock;
thlcgwasm(hlcg).loopBreakBr:=thlcgwasm(hlcg).br_blocks;
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_loop));
thlcgwasm(hlcg).incblock;
if lnf_testatbegin in loopflags then
begin
pass_generate_code_condition;
thlcgwasm(hlcg).loopContBr:=thlcgwasm(hlcg).br_blocks;
end else
thlcgwasm(hlcg).loopContBr:=thlcgwasm(hlcg).br_blocks+1;
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_block));
thlcgwasm(hlcg).incblock;
current_procinfo.CurrContinueLabel:=lcont;
current_procinfo.CurrBreakLabel:=lbreak;
secondpass(right);
if (lnf_testatbegin in loopflags) then
current_asmdata.CurrAsmList.concat(taicpu.op_const(a_br,1) ); // jump back to the external loop
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_end_block));
thlcgwasm(hlcg).decblock;
if not (lnf_testatbegin in loopflags) then begin
pass_generate_code_condition;
end;
current_asmdata.CurrAsmList.concat(taicpu.op_const(a_br,0) ); // jump back to loop
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_end_loop));
thlcgwasm(hlcg).decblock;
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_end_block));
thlcgwasm(hlcg).decblock;
current_procinfo.CurrContinueLabel:=oldclabel;
current_procinfo.CurrBreakLabel:=oldblabel;
thlcgwasm(hlcg).loopContBr:=oldloopcontbroffset;
thlcgwasm(hlcg).loopBreakBr:=oldloopbreakbroffset;
{ a break/continue in a while/repeat block can't be seen outside }
flowcontrol:=oldflowcontrol+(flowcontrol-[fc_break,fc_continue,fc_inflowcontrol]);
end;
{*****************************************************************************
twasmifnode
*****************************************************************************}
procedure twasmifnode.pass_generate_code;
var
oldflowcontrol: tflowcontrol;
begin
// left - condition
// right - then
// t1 - else (optional)
location_reset(location,LOC_VOID,OS_NO);
oldflowcontrol := flowcontrol;
include(flowcontrol,fc_inflowcontrol);
//todo: MOVE all current_asm_data actions to Wasm HL CodeGen
secondpass(left); // condition exprssions
thlcgwasm(hlcg).a_load_loc_stack(current_asmdata.CurrAsmList,left.resultdef,left.location);
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_if));
thlcgwasm(hlcg).incblock;
thlcgwasm(hlcg).decstack(current_asmdata.CurrAsmList,1);
if Assigned(right) then
secondpass(right); // then branchs
if Assigned(t1) then // else branch
begin
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_else));
secondpass(t1);
end;
current_asmdata.CurrAsmList.concat(taicpu.op_none(a_end_if));
thlcgwasm(hlcg).decblock;
flowcontrol := oldflowcontrol + (flowcontrol - [fc_inflowcontrol]);
end;
{*****************************************************************************
twasmtryexceptnode
*****************************************************************************}
procedure twasmtryexceptnode.pass_generate_code;
begin
location_reset(location,LOC_VOID,OS_NO);
current_asmdata.CurrAsmList.concat(tai_comment.Create(strpnew('TODO: try..except, try')));
secondpass(left);
//if codegenerror then
// goto errorexit;
current_asmdata.CurrAsmList.concat(tai_comment.Create(strpnew('TODO: try..except, end')));
end;
{*****************************************************************************
twasmtryfinallynode
*****************************************************************************}
procedure twasmtryfinallynode.pass_generate_code;
begin
location_reset(location,LOC_VOID,OS_NO);
current_asmdata.CurrAsmList.concat(tai_comment.Create(strpnew('TODO: try..finally, try')));
{ try code }
if assigned(left) then
begin
secondpass(left);
if codegenerror then
exit;
end;
current_asmdata.CurrAsmList.concat(tai_comment.Create(strpnew('TODO: try..finally, finally')));
{ finally code (don't unconditionally set fc_inflowcontrol, since the
finally code is unconditionally executed; we do have to filter out
flags regarding break/contrinue/etc. because we have to give an
error in case one of those is used in the finally-code }
//flowcontrol:=finallyexceptionstate.oldflowcontrol*[fc_inflowcontrol,fc_catching_exceptions];
secondpass(right);
{ goto is allowed if it stays inside the finally block,
this is checked using the exception block number }
//if (flowcontrol-[fc_gotolabel])<>(finallyexceptionstate.oldflowcontrol*[fc_inflowcontrol,fc_catching_exceptions]) then
// CGMessage(cg_e_control_flow_outside_finally);
if codegenerror then
exit;
current_asmdata.CurrAsmList.concat(tai_comment.Create(strpnew('TODO: try..finally, end')));
end;
initialization
cifnode:=twasmifnode;
cwhilerepeatnode:=twasmwhilerepeatnode;
ctryexceptnode:=twasmtryexceptnode;
ctryfinallynode:=twasmtryfinallynode;
end.
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