private LuaObject FastTM( LuaTable et, TMS tm )
{
if( et == null )
return null;
if( (et.NoTagMethodFlags & (1u << (int)tm)) != 0u )
return null;
return T_GetTM( et, tm );
}
internal void SetHValue(LuaTable v)
{
#if DEBUG_DUMMY_TVALUE_MODIFY
CheckLock();
#endif
Tt = (int)LuaType.LUA_TTABLE;
NValue = 0.0;
UInt64Value = 0;
OValue = v;
}
void ILuaAPI.CreateTable( int narray, int nrec )
{
var tbl = new LuaTable(this);
Top.V.SetHValue(tbl);
ApiIncrTop();
if(narray > 0 || nrec > 0)
{ tbl.Resize(narray, nrec); }
}
private void V_Execute()
{
ExecuteEnvironment env;
CallInfo ci = CI;
newframe:
Utl.Assert(ci == CI);
var cl = Stack[ci.FuncIndex].V.ClLValue();
env.Stack = Stack;
env.K = cl.Proto.K;
env.Base = ci.BaseIndex;
#if DEBUG_NEW_FRAME
ULDebug.Log( "#### NEW FRAME #########################################################################" );
ULDebug.Log( "## cl:" + cl );
ULDebug.Log( "## Base:" + env.Base );
ULDebug.Log( "########################################################################################" );
#endif
while( true )
{
Instruction i = ci.SavedPc.ValueInc;
env.I = i;
#if DEBUG_SRC_INFO
int line = 0;
string src = "";
if(ci.IsLua) {
line = GetCurrentLine(ci);
src = GetCurrentLuaFunc(ci).Proto.Source;
}
#endif
StkId ra = env.RA;
#if DEBUG_DUMP_INS_STACK
#if DEBUG_DUMP_INS_STACK_EX
DumpStack( env.Base, i.ToString() );
#else
DumpStack( env.Base );
#endif
#endif
#if DEBUG_INSTRUCTION
ULDebug.Log( System.DateTime.Now + " [VM] ======================================================================== Instruction: " + i
#if DEBUG_INSTRUCTION_WITH_STACK
+ "\n" + DumpStackToString( env.Base.Index )
#endif
);
#endif
#if DEBUG_RECORD_INS
InstructionHistory.Enqueue(i);
if( InstructionHistory.Count > 100 ) {
InstructionHistory.Dequeue();
}
#endif
switch( i.GET_OPCODE() )
{
case OpCode.OP_MOVE:
{
var rb = env.RB;
#if DEBUG_OP_MOVE
ULDebug.Log( "[VM] ==== OP_MOVE rb:" + rb );
ULDebug.Log( "[VM] ==== OP_MOVE ra:" + ra );
#endif
ra.V.SetObj(ref rb.V);
break;
}
case OpCode.OP_LOADK:
{
var rb = env.K[i.GETARG_Bx()];
ra.V.SetObj(ref rb.V);
break;
}
case OpCode.OP_LOADKX:
{
Utl.Assert( ci.SavedPc.Value.GET_OPCODE() == OpCode.OP_EXTRAARG );
var rb = env.K[ci.SavedPc.ValueInc.GETARG_Ax()];
ra.V.SetObj(ref rb.V);
break;
}
case OpCode.OP_LOADBOOL:
{
ra.V.SetBValue(i.GETARG_B() != 0);
if( i.GETARG_C() != 0 )
ci.SavedPc.Index += 1; // skip next instruction (if C)
break;
}
case OpCode.OP_LOADNIL:
{
int b = i.GETARG_B();
int index = ra.Index;
do {
Stack[index++].V.SetNilValue();
} while (b-- > 0);
break;
}
case OpCode.OP_GETUPVAL:
{
int b = i.GETARG_B();
ra.V.SetObj(ref cl.Upvals[b].V.V);
#if DEBUG_OP_GETUPVAL
// for( var j=0; j<cl.Upvals.Length; ++j)
// {
// ULDebug.Log("[VM] ==== GETUPVAL upval:" + cl.Upvals[j] );
// }
ULDebug.Log( "[VM] ==== GETUPVAL b:" + b );
ULDebug.Log( "[VM] ==== GETUPVAL ra:" + ra );
#endif
break;
}
case OpCode.OP_GETTABUP:
{
int b = i.GETARG_B();
var key = env.RKC;
V_GetTable( cl.Upvals[b].V, key, ra );
#if DEBUG_OP_GETTABUP
ULDebug.Log( "[VM] ==== OP_GETTABUP key:" + key );
ULDebug.Log( "[VM] ==== OP_GETTABUP val:" + ra );
#endif
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_GETTABLE:
{
var tbl = env.RB;
var key = env.RKC;
var val = ra;
V_GetTable( tbl, key, val );
#if DEBUG_OP_GETTABLE
ULDebug.Log("[VM] ==== OP_GETTABLE key:"+key.ToString());
ULDebug.Log("[VM] ==== OP_GETTABLE val:"+val.ToString());
#endif
break;
}
case OpCode.OP_SETTABUP:
{
int a = i.GETARG_A();
var key = env.RKB;
var val = env.RKC;
V_SetTable( cl.Upvals[a].V, key, val );
#if DEBUG_OP_SETTABUP
ULDebug.Log( "[VM] ==== OP_SETTABUP key:" + key.Value );
ULDebug.Log( "[VM] ==== OP_SETTABUP val:" + val.Value );
#endif
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_SETUPVAL:
{
int b = i.GETARG_B();
var uv = cl.Upvals[b];
uv.V.V.SetObj(ref ra.V);
#if DEBUG_OP_SETUPVAL
ULDebug.Log( "[VM] ==== SETUPVAL b:" + b );
ULDebug.Log( "[VM] ==== SETUPVAL ra:" + ra );
#endif
break;
}
case OpCode.OP_SETTABLE:
{
var key = env.RKB;
var val = env.RKC;
#if DEBUG_OP_SETTABLE
ULDebug.Log( "[VM] ==== OP_SETTABLE key:" + key.ToString() );
ULDebug.Log( "[VM] ==== OP_SETTABLE val:" + val.ToString() );
#endif
V_SetTable( ra, key, val );
break;
}
case OpCode.OP_NEWTABLE:
{
int b = i.GETARG_B();
int c = i.GETARG_C();
var tbl = new LuaTable(this);
ra.V.SetHValue(tbl);
if(b > 0 || c > 0)
{ tbl.Resize(b, c); }
break;
}
case OpCode.OP_SELF:
{
// OP_SELF put function referenced by a table on ra
// and the table on ra+1
//
// RB: table
// RKC: key
var ra1 = Stack[ra.Index+1];
var rb = env.RB;
ra1.V.SetObj(ref rb.V);
V_GetTable( rb, env.RKC, ra );
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_ADD:
{
var rkb = env.RKB;
var rkc = env.RKC;
if(rkb.V.TtIsNumber() && rkc.V.TtIsNumber())
{ ra.V.SetNValue(rkb.V.NValue + rkc.V.NValue); }
else
{ V_Arith(ra, rkb, rkc, TMS.TM_ADD); }
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_SUB:
{
var rkb = env.RKB;
var rkc = env.RKC;
if(rkb.V.TtIsNumber() && rkc.V.TtIsNumber())
{ ra.V.SetNValue(rkb.V.NValue - rkc.V.NValue); }
else
{ V_Arith(ra, rkb, rkc, TMS.TM_SUB); }
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_MUL:
{
var rkb = env.RKB;
var rkc = env.RKC;
if(rkb.V.TtIsNumber() && rkc.V.TtIsNumber())
{ ra.V.SetNValue(rkb.V.NValue * rkc.V.NValue); }
else
{ V_Arith(ra, rkb, rkc, TMS.TM_MUL); }
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_DIV:
{
var rkb = env.RKB;
var rkc = env.RKC;
if(rkb.V.TtIsNumber() && rkc.V.TtIsNumber())
{ ra.V.SetNValue(rkb.V.NValue / rkc.V.NValue); }
else
{ V_Arith(ra, rkb, rkc, TMS.TM_DIV); }
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_MOD:
{
var rkb = env.RKB;
var rkc = env.RKC;
if(rkb.V.TtIsNumber() && rkc.V.TtIsNumber())
{ ra.V.SetNValue(rkb.V.NValue % rkc.V.NValue); }
else
{ V_Arith(ra, rkb, rkc, TMS.TM_MOD); }
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_POW:
{
var rkb = env.RKB;
var rkc = env.RKC;
if(rkb.V.TtIsNumber() && rkc.V.TtIsNumber())
{ ra.V.SetNValue(Math.Pow(rkb.V.NValue, rkc.V.NValue)); }
else
{ V_Arith(ra, rkb, rkc, TMS.TM_POW); }
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_UNM:
{
var rb = env.RB;
if(rb.V.TtIsNumber()) {
ra.V.SetNValue(-rb.V.NValue);
}
else {
V_Arith(ra, rb, rb, TMS.TM_UNM);
env.Base = ci.BaseIndex;
}
break;
}
case OpCode.OP_NOT:
{
var rb = env.RB;
ra.V.SetBValue(IsFalse(ref rb.V));
break;
}
case OpCode.OP_LEN:
{
V_ObjLen( ra, env.RB );
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_CONCAT:
{
int b = i.GETARG_B();
int c = i.GETARG_C();
Top = Stack[env.Base + c + 1];
V_Concat( c - b + 1 );
env.Base = ci.BaseIndex;
ra = env.RA; // 'V_Concat' may invoke TMs and move the stack
StkId rb = env.RB;
ra.V.SetObj(ref rb.V);
Top = Stack[ci.TopIndex]; // restore top
break;
}
case OpCode.OP_JMP:
{
V_DoJump( ci, i, 0 );
break;
}
case OpCode.OP_EQ:
{
var lhs = env.RKB;
var rhs = env.RKC;
var expectEq = i.GETARG_A() != 0;
#if DEBUG_OP_EQ
ULDebug.Log( "[VM] ==== OP_EQ lhs:" + lhs );
ULDebug.Log( "[VM] ==== OP_EQ rhs:" + rhs );
ULDebug.Log( "[VM] ==== OP_EQ expectEq:" + expectEq );
ULDebug.Log( "[VM] ==== OP_EQ (lhs.V == rhs.V):" + (lhs.V == rhs.V) );
#endif
if((lhs.V == rhs.V) != expectEq)
{
ci.SavedPc.Index += 1; // skip next jump instruction
}
else
{
V_DoNextJump( ci );
}
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_LT:
{
var expectCmpResult = i.GETARG_A() != 0;
if( V_LessThan( env.RKB, env.RKC ) != expectCmpResult )
ci.SavedPc.Index += 1;
else
V_DoNextJump( ci );
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_LE:
{
var expectCmpResult = i.GETARG_A() != 0;
if( V_LessEqual( env.RKB, env.RKC ) != expectCmpResult )
ci.SavedPc.Index += 1;
else
V_DoNextJump( ci );
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_TEST:
{
if((i.GETARG_C() != 0) ?
IsFalse(ref ra.V) : !IsFalse(ref ra.V))
{
ci.SavedPc.Index += 1;
}
else V_DoNextJump( ci );
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_TESTSET:
{
var rb = env.RB;
if((i.GETARG_C() != 0) ?
IsFalse(ref rb.V) : !IsFalse(ref rb.V))
{
ci.SavedPc.Index += 1;
}
else
{
ra.V.SetObj(ref rb.V);
V_DoNextJump( ci );
}
env.Base = ci.BaseIndex;
break;
}
case OpCode.OP_CALL:
{
int b = i.GETARG_B();
int nresults = i.GETARG_C() - 1;
if( b != 0) { Top = Stack[ra.Index + b]; } // else previous instruction set top
if( D_PreCall( ra, nresults ) ) { // C# function?
if( nresults >= 0 )
Top = Stack[ci.TopIndex];
env.Base = ci.BaseIndex;
}
else { // Lua function
ci = CI;
ci.CallStatus |= CallStatus.CIST_REENTRY;
goto newframe;
}
break;
}
case OpCode.OP_TAILCALL:
{
int b = i.GETARG_B();
if( b != 0) { Top = Stack[ra.Index + b]; } // else previous instruction set top
Utl.Assert( i.GETARG_C() - 1 == LuaDef.LUA_MULTRET );
var called = D_PreCall( ra, LuaDef.LUA_MULTRET );
// C# function ?
if( called )
{
env.Base = ci.BaseIndex;
}
// LuaFunciton
else
{
var nci = CI; // called frame
var oci = BaseCI[CI.Index-1]; // caller frame
StkId nfunc = Stack[nci.FuncIndex];// called function
StkId ofunc = Stack[oci.FuncIndex];// caller function
var ncl = nfunc.V.ClLValue();
var ocl = ofunc.V.ClLValue();
// last stack slot filled by 'precall'
int lim = nci.BaseIndex + ncl.Proto.NumParams;
if(cl.Proto.P.Count > 0)
{ F_Close( Stack[env.Base] ); }
// move new frame into old one
var nindex = nfunc.Index;
var oindex = ofunc.Index;
while(nindex < lim) {
Stack[oindex++].V.SetObj(ref Stack[nindex++].V);
}
oci.BaseIndex = ofunc.Index + (nci.BaseIndex - nfunc.Index);
oci.TopIndex = ofunc.Index + (Top.Index - nfunc.Index);
Top = Stack[oci.TopIndex];
oci.SavedPc = nci.SavedPc;
oci.CallStatus |= CallStatus.CIST_TAIL;
ci = CI = oci;
ocl = ofunc.V.ClLValue();
Utl.Assert(Top.Index == oci.BaseIndex + ocl.Proto.MaxStackSize);
goto newframe;
}
break;
}
case OpCode.OP_RETURN:
{
int b = i.GETARG_B();
if( b != 0 ) { Top = Stack[ra.Index + b - 1]; }
if( cl.Proto.P.Count > 0 ) { F_Close(Stack[env.Base]); }
b = D_PosCall( ra.Index );
if( (ci.CallStatus & CallStatus.CIST_REENTRY) == 0 )
{
return;
}
else
{
ci = CI;
if( b != 0 ) Top = Stack[ci.TopIndex];
goto newframe;
}
}
case OpCode.OP_FORLOOP:
{
var ra1 = Stack[ra.Index + 1];
var ra2 = Stack[ra.Index + 2];
var ra3 = Stack[ra.Index + 3];
var step = ra2.V.NValue;
var idx = ra.V.NValue + step; // increment index
var limit = ra1.V.NValue;
if( (0 < step) ? idx <= limit
: limit <= idx )
{
ci.SavedPc.Index += i.GETARG_sBx(); // jump back
ra.V.SetNValue(idx);// updateinternal index...
ra3.V.SetNValue(idx);// ... and external index
}
break;
}
case OpCode.OP_FORPREP:
{
var init = new TValue();
var limit = new TValue();
var step = new TValue();
var ra1 = Stack[ra.Index + 1];
var ra2 = Stack[ra.Index + 2];
// WHY: why limit is not used ?
if(!V_ToNumber(ra, ref init))
G_RunError("'for' initial value must be a number");
if(!V_ToNumber(ra1, ref limit))
G_RunError("'for' limit must be a number");
if(!V_ToNumber(ra2, ref step))
G_RunError("'for' step must be a number");
ra.V.SetNValue(init.NValue - step.NValue);
ci.SavedPc.Index += i.GETARG_sBx();
break;
}
case OpCode.OP_TFORCALL:
{
int rai = ra.Index;
int cbi = ra.Index + 3;
Stack[cbi+2].V.SetObj(ref Stack[rai+2].V);
Stack[cbi+1].V.SetObj(ref Stack[rai+1].V);
Stack[cbi].V.SetObj(ref Stack[rai].V);
StkId callBase = Stack[cbi];
Top = Stack[cbi+3]; // func. +2 args (state and index)
D_Call( callBase, i.GETARG_C(), true );
env.Base = ci.BaseIndex;
Top = Stack[ci.TopIndex];
i = ci.SavedPc.ValueInc; // go to next instruction
env.I = i;
ra = env.RA;
DumpStack( env.Base );
#if DEBUG_INSTRUCTION
ULDebug.Log( "[VM] ============================================================ OP_TFORCALL Instruction: " + i );
#endif
Utl.Assert( i.GET_OPCODE() == OpCode.OP_TFORLOOP );
goto l_tforloop;
}
case OpCode.OP_TFORLOOP:
l_tforloop:
{
StkId ra1 = Stack[ra.Index + 1];
if(!ra1.V.TtIsNil()) // continue loop?
{
ra.V.SetObj(ref ra1.V);
ci.SavedPc += i.GETARG_sBx();
}
break;
}
// sets the values for a range of array elements in a table(RA)
// RA -> table
// RB -> number of elements to set
// C -> encodes the block number of the table to be initialized
// the values used to initialize the table are located in
// R(A+1), R(A+2) ...
case OpCode.OP_SETLIST:
{
int n = i.GETARG_B();
int c = i.GETARG_C();
if( n == 0 ) n = (Top.Index - ra.Index) - 1;
if( c == 0 )
{
Utl.Assert( ci.SavedPc.Value.GET_OPCODE() == OpCode.OP_EXTRAARG );
c = ci.SavedPc.ValueInc.GETARG_Ax();
}
var tbl = ra.V.HValue();
Utl.Assert( tbl != null );
int last = ((c-1) * LuaDef.LFIELDS_PER_FLUSH) + n;
int rai = ra.Index;
for(; n>0; --n) {
tbl.SetInt(last--, ref Stack[rai+n].V);
}
#if DEBUG_OP_SETLIST
ULDebug.Log( "[VM] ==== OP_SETLIST ci.Top:" + ci.Top.Index );
ULDebug.Log( "[VM] ==== OP_SETLIST Top:" + Top.Index );
#endif
Top = Stack[ci.TopIndex]; // correct top (in case of previous open call)
break;
}
case OpCode.OP_CLOSURE:
{
LuaProto p = cl.Proto.P[ i.GETARG_Bx() ];
V_PushClosure( p, cl.Upvals, env.Base, ra );
#if DEBUG_OP_CLOSURE
ULDebug.Log( "OP_CLOSURE:" + ra.Value );
var racl = ra.Value as LuaLClosure;
if( racl != null )
{
for( int ii=0; ii<racl.Upvals.Count; ++ii )
{
ULDebug.Log( ii + " ) " + racl.Upvals[ii] );
}
}
#endif
break;
}
/// <summary>
/// VARARG implements the vararg operator `...' in expressions.
/// VARARG copies B-1 parameters into a number of registers
/// starting from R(A), padding with nils if there aren't enough values.
/// If B is 0, VARARG copies as many values as it can based on
/// the number of parameters passed.
/// If a fixed number of values is required, B is a value greater than 1.
/// If any number of values is required, B is 0.
/// </summary>
case OpCode.OP_VARARG:
{
int b = i.GETARG_B() - 1;
int n = (env.Base - ci.FuncIndex) - cl.Proto.NumParams - 1;
if( b < 0 ) // B == 0?
{
b = n;
D_CheckStack(n);
ra = env.RA; // previous call may change the stack
Top = Stack[ra.Index + n];
}
var p = ra.Index;
var q = env.Base - n;
for(int j=0; j<b; ++j) {
if(j < n) {
Stack[p++].V.SetObj(ref Stack[q++].V);
}
else {
Stack[p++].V.SetNilValue();
}
}
break;
}
case OpCode.OP_EXTRAARG:
{
Utl.Assert( false );
V_NotImplemented( i );
break;
}
default:
V_NotImplemented( i );
break;
}
}
}
private StkId GetEqualTM( LuaTable mt1, LuaTable mt2, TMS tm )
{
var tm1 = FastTM( mt1, tm );
if(tm1 == null) // no metamethod
return null;
if(mt1 == mt2) // same metatables => same metamethods
return tm1;
var tm2 = FastTM( mt2, tm );
if(tm2 == null) // no metamethod
return null;
if(V_RawEqualObj(ref tm1.V, ref tm2.V)) // same metamethods?
return tm1;
return null;
}
private LuaObject GetEqualTM( LuaTable mt1, LuaTable mt2, TMS tm )
{
LuaObject tm1 = FastTM( mt1, tm );
if( tm1 == null ) // no metamethod
return null;
if( mt1 == mt2 ) // same metatables => same metamethods
return tm1;
LuaObject tm2 = FastTM( mt2, tm );
if( tm2 == null ) // no metamethod
return null;
if( V_RawEqualObj( tm1, tm2 ) ) // same metamethods?
return tm1;
return null;
}
