Exemplo n.º 1
0
		/// <summary>
		/// prepare top operator (prepare postfix record or expression tree node)
		/// </summary>
		void Parser.IGenerator.Prepare( Opcode op )
		{
			Debug.Assert( (op.Kind() <= Opkind.Prepost) && (op.Kind() >= Opkind.Special) );
			if( op.Binary() )
			{
				goto binary;
			}
			if( op.Ternary() )
			{
				goto ternary;
			}
			if( op.Multi() )
			{
				goto multi;
			}
			Debug.Assert( op.Unary() );
			var start = PopInt();
			Vneed( 1 );
			Vpush( unchecked((byte)op) );
			Vpush( start );
			return;
		binary:
			var rstart = TopInt();
			var lstart = TopInt( rstart );
			Vneed( 5 );
			Vpush( op.Code() );
			Vpush( lstart );
			return;
		ternary:
			var fstart = TopInt();
			var tstart = TopInt( fstart );
			var cstart = TopInt( tstart );
			Vneed( 5 );
			Vpush( op.Code() );
			Vpush( cstart );
			return;
		multi:
			Debug.Assert( (((op == Opcode.Mcall) || (op == Opcode.Mindex)) || (op == Opcode.Array)) || (op == Opcode.Generic) );
			var mstart = TopInt();
			var n = 1;
			if( (op == Opcode.Mcall) || (op == Opcode.Mindex) )
			{
				n++;
				mstart = TopInt( mstart );
			}
			while( (Parser.OpsAt > 0) && (Parser.Top() == Opcode.Comma) ){
				Parser.Pop();
				n++;
				mstart = TopInt( mstart );
			}
			if( n > 127 )
			{
				throw new ParseError( Parser, "Too many arguments" );
			}
			if( (n == 3) && (op == Opcode.Mcall) )
			{
				Vneed( 5 );
				Vpush( unchecked((byte)Opcode.Call2) );
				Vpush( mstart );
				return;
			}
			Vneed( 6 );
			Vpush( unchecked((byte)n) );
			Vpush( op.Code() );
			Vpush( mstart );
			return;
		}//Parser.IGenerator.Prepare