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{
Copyright (c) 1998-2020 by the Free Pascal team
This unit implements the llvm-mc ("llvm machine code playground")
assembler writer for WebAssembly
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 agllvmmc;
{$i fpcdefs.inc}
interface
uses
systems,cgutils,
globtype,globals,
symbase,symdef,symtype,symconst,symcpu,
aasmbase,aasmtai,aasmdata,aasmcpu,
assemble,aggas;
type
{ TLLVMMachineCodePlaygroundAssembler }
TLLVMMachineCodePlaygroundAssembler=class(TGNUassembler)
protected
procedure WriteImports;
function sectionname(atype:TAsmSectiontype;const aname:string;aorder:TAsmSectionOrder):string;override;
public
constructor CreateWithWriter(info: pasminfo; wr: TExternalAssemblerOutputFile; freewriter, smart: boolean); override;
procedure WriteAsmList;override;
end;
{ TWASM32InstrWriter }
TWASM32InstrWriter = class(TCPUInstrWriter)
procedure WriteInstruction(hp : tai);override;
end;
implementation
uses
cutils,
fmodule,finput,
itcpugas,
cpubase,
hlcgobj,hlcgcpu,
verbose;
{ TLLVMMachineCodePlaygroundAssembler }
procedure TLLVMMachineCodePlaygroundAssembler.WriteImports;
var
i : integer;
def : tdef;
proc : tprocdef;
list : TAsmList;
cur_unit: tused_unit;
begin
for i:=0 to current_module.deflist.Count-1 do
begin
def:=tdef(current_module.deflist[i]);
{ since commit 48986 deflist might have NIL entries }
if assigned(def) and (def.typ=procdef) then
begin
proc := tprocdef(def);
if (po_external in proc.procoptions) and assigned(proc.import_dll) then
begin
//WriteProcDef(proc);
list:=TAsmList.Create;
thlcgwasm(hlcg).g_procdef(list,proc);
WriteTree(list);
list.free;
writer.AsmWrite(#9'.import_module'#9);
writer.AsmWrite(proc.mangledname);
writer.AsmWrite(', ');
writer.AsmWriteLn(proc.import_dll^);
writer.AsmWrite(#9'.import_name'#9);
writer.AsmWrite(proc.mangledname);
writer.AsmWrite(', ');
writer.AsmWriteLn(proc.import_name^);
end;
end;
end;
list:=TAsmList.Create;
cur_unit:=tused_unit(usedunits.First);
while assigned(cur_unit) do
begin
if (cur_unit.u.moduleflags * [mf_init,mf_finalize])<>[] then
begin
if mf_init in cur_unit.u.moduleflags then
list.Concat(tai_functype.create(make_mangledname('INIT$',cur_unit.u.globalsymtable,''),TWasmFuncType.Create([],[])));
if mf_finalize in cur_unit.u.moduleflags then
list.Concat(tai_functype.create(make_mangledname('FINALIZE$',cur_unit.u.globalsymtable,''),TWasmFuncType.Create([],[])));
end;
for i:=0 to cur_unit.u.deflist.Count-1 do
begin
def:=tdef(cur_unit.u.deflist[i]);
if assigned(def) and (tdef(def).typ = procdef) then
begin
proc := tprocdef(def);
if (not proc.owner.iscurrentunit or (po_external in proc.procoptions)) and
((proc.paras.Count=0) or (proc.has_paraloc_info in [callerside,callbothsides])) then
thlcgwasm(hlcg).g_procdef(list,proc);
end;
end;
cur_unit:=tused_unit(cur_unit.Next);
end;
WriteTree(list);
list.free;
end;
function TLLVMMachineCodePlaygroundAssembler.sectionname(atype: TAsmSectiontype; const aname: string; aorder: TAsmSectionOrder): string;
begin
if (atype=sec_fpc) or (atype=sec_threadvar) then
atype:=sec_data;
Result:=inherited sectionname(atype, aname, aorder)+',"",@';
end;
constructor TLLVMMachineCodePlaygroundAssembler.CreateWithWriter(info: pasminfo; wr: TExternalAssemblerOutputFile; freewriter, smart: boolean);
begin
inherited;
InstrWriter:=TWASM32InstrWriter.create(self);
end;
procedure TLLVMMachineCodePlaygroundAssembler.WriteAsmList;
begin
inherited;
{ print all global procedures/functions }
writer.AsmWriteLn(#9'.globaltype'#9+STACK_POINTER_SYM+', i32');
WriteImports;
end;
{ TWASM32InstrWriter }
procedure TWASM32InstrWriter.WriteInstruction(hp: tai);
function getreferencestring(var ref : treference) : ansistring;
begin
if assigned(ref.symbol) then
begin
// global symbol or field -> full type and name
// ref.base can be <> NR_NO in case an instance field is loaded.
// This register is not part of this instruction, it will have
// been placed on the stack by the previous one.
result:=ref.symbol.name;
if ref.base<>NR_NO then
result:=result+'+'+std_regname(ref.base);
if ref.index<>NR_NO then
result:=result+'+'+std_regname(ref.index);
if ref.offset>0 then
result:=result+'+'+tostr(ref.offset)
else if ref.offset<0 then
result:=result+tostr(ref.offset);
end
else
begin
// local symbol -> stack slot, stored in offset
result:='';
if (ref.base<>NR_STACK_POINTER_REG) and (ref.base<>NR_NO) then
result:=std_regname(ref.base);
if ref.index<>NR_NO then
if result<>'' then
result:=result+'+'+std_regname(ref.index)
else
result:=std_regname(ref.index);
if ref.offset>0 then
begin
if result<>'' then
result:=result+'+'+tostr(ref.offset)
else
result:=tostr(ref.offset);
end
else if ref.offset<0 then
result:=result+tostr(ref.offset);
if result='' then
result:='0';
end;
end;
function constfloat(rawfloat: int64; fraction_bits, exponent_bits, exponent_bias: Integer): ansistring;
var
sign: boolean;
fraction: int64;
exponent, fraction_hexdigits: integer;
begin
fraction_hexdigits := (fraction_bits + 3) div 4;
sign:=(rawfloat shr (fraction_bits+exponent_bits))<>0;
fraction:=rawfloat and ((int64(1) shl fraction_bits)-1);
exponent:=(rawfloat shr fraction_bits) and ((1 shl exponent_bits)-1);
if sign then
result:='-'
else
result:='';
if (exponent=(1 shl exponent_bits)-1) then
begin
if fraction=0 then
result:=result+'infinity'
else
begin
result:=result+'nan';
if fraction<>(int64(1) shl (fraction_bits-1)) then
result:=result+':0x'+HexStr(fraction,fraction_hexdigits);
end;
end
else
result:=result+'0x1.'+HexStr(fraction,fraction_hexdigits)+'p'+tostr(exponent-exponent_bias);
end;
function constsingle(s: single): ansistring;
type
tsingleval = record
case byte of
1: (s: single);
2: (i: longword);
end;
begin
result:=constfloat(tsingleval(s).i,23,8,127);
end;
function constdouble(d: double): ansistring;
type
tdoubleval = record
case byte of
1: (d: double);
2: (i: int64);
end;
begin
result:=constfloat(tdoubleval(d).i,52,11,1023);
end;
function getopstr(const o:toper) : ansistring;
var
d: double;
s: single;
begin
case o.typ of
top_reg:
// should have been translated into a memory location by the
// register allocator)
if (cs_no_regalloc in current_settings.globalswitches) then
getopstr:=std_regname(o.reg)
else
internalerror(2010122803);
top_const:
str(o.val,result);
top_ref:
getopstr:=getreferencestring(o.ref^);
top_single:
begin
result:=constsingle(o.sval);
end;
top_double:
begin
result:=constdouble(o.dval);
end;
{top_string:
begin
result:=constastr(o.pcval,o.pcvallen);
end;
top_wstring:
begin
result:=constwstr(o.pwstrval^.data,getlengthwidestring(o.pwstrval));
end}
else
internalerror(2010122802);
end;
end;
var
cpu : taicpu;
i : integer;
writer: TExternalAssemblerOutputFile;
begin
writer:=owner.writer;
cpu := taicpu(hp);
writer.AsmWrite(#9#9);
writer.AsmWrite(gas_op2str[cpu.opcode]);
if cpu.ops<>0 then
begin
for i:=0 to cpu.ops-1 do
begin
writer.AsmWrite(#9);
if cpu.oper[i]^.typ=top_functype then
owner.WriteFuncType(cpu.oper[i]^.functype)
else
writer.AsmWrite(getopstr(cpu.oper[i]^));
end;
end;
writer.AsmLn;
end;
const
as_wasm32_llvm_mc_info : tasminfo =
(
id : as_wasm32_llvm_mc;
idtxt : 'LLVM-MC';
asmbin : 'llvm-mc';
asmcmd : '--assemble --arch=wasm32 -mattr=+sign-ext --filetype=obj -o $OBJ $EXTRAOPT $ASM';
supported_targets : [system_wasm32_embedded,system_wasm32_wasi];
flags : [af_smartlink_sections];
labelprefix : '.L';
labelmaxlen : -1;
comment : '# ';
dollarsign : '$';
);
initialization
RegisterAssembler(as_wasm32_llvm_mc_info,TLLVMMachineCodePlaygroundAssembler);
end.
|