private void TunnelingProcessNode(SyntaxTreeNode node)
{
if (node.Value is Nonterminal && !node.IsEpsilon)
{
var nonterminal = node.Value as Nonterminal;
if (nonterminal.Equals(FormalNonterminals.IF_STATEMENT))
{
node.Value[END_BLOCK_LABEL_KEY] = _code.Helper.GetTempLabel();
if (!node[FormalNonterminals.ELSE_BLOCK].IsEpsilon)
{
node[FormalNonterminals.ELSE_BLOCK].Value[BEGIN_BLOCK_LABEL_KEY] = _code.Helper.GetTempLabel();
}
}
if (nonterminal.Equals(FormalNonterminals.ELSE_BLOCK))
{
_code.Emit(new Instruction(OpCode.LTRGT, (Operand)node.Value[BEGIN_BLOCK_LABEL_KEY], null, null));
}
if (nonterminal.Equals(FormalNonterminals.FOR_STATEMENT))
{
node.Value[END_BLOCK_LABEL_KEY] = _code.Helper.GetTempLabel();
node[FormalNonterminals.FOR_TEST_BLOCK].Value[BEGIN_BLOCK_LABEL_KEY] = _code.Helper.GetTempLabel();
node[FormalNonterminals.FOR_STEP_BLOCK].Value[BEGIN_BLOCK_LABEL_KEY] = _code.Helper.GetTempLabel();
node[FormalNonterminals.FOR_BODY_BLOCK].Value[BEGIN_BLOCK_LABEL_KEY] = _code.Helper.GetTempLabel();
}
if (nonterminal.Equals(FormalNonterminals.FOR_TEST_BLOCK) || nonterminal.Equals(FormalNonterminals.FOR_STEP_BLOCK) || nonterminal.Equals(FormalNonterminals.FOR_BODY_BLOCK))
{
_code.Emit(new Instruction(OpCode.LTRGT, (Operand)node.Value[BEGIN_BLOCK_LABEL_KEY], null, null));
}
}
}
private void TunnelingProcessNode(SyntaxTreeNode node)
{
if (!node.HasNoChildren && node.Value is Nonterminal)
{
var nonterminal = node.Value as Nonterminal;
if (nonterminal.Equals(MyNonterminals.IF_STATEMENT))
{
var ifBeginLabel = _code.Helper.GetTempLabel();
var ifEndLabel = _code.Helper.GetTempLabel();
node.Value.Attributes[IF_BEGIN_LABEL_KEY] = ifBeginLabel;
node.Value.Attributes[IF_END_LABEL_KEY] = ifEndLabel;
}
else if (nonterminal.Equals(MyNonterminals.THEN_BLOCK) || nonterminal.Equals(MyNonterminals.ELSE_BLOCK))
{
if (nonterminal.Equals(MyNonterminals.THEN_BLOCK))
{
_code.Emit(new Instruction(OpCode.JMP, node.Parent.Value[IF_BEGIN_LABEL_KEY] as Operand, null, null));
}
var blockBeginLabel = _code.Helper.GetTempLabel();
node.Value.Attributes[LABEL_KEY] = blockBeginLabel;
_code.Emit(new Instruction(OpCode.LTRGT, blockBeginLabel, null, null));
}
}
}