/* get an identifier */
public void scan()
{
skipWhite();
if (Char.IsLetter(io.getNextChar()))
{
LoadName();
}
else if (Char.IsDigit(io.getNextChar()))
{
LoadNum();
}
else if (isOp(io.getNextChar()))
{
LoadOp();
}
else if (io.EOF())
{
value = null;
token_id = T_EOF;
}
else
{
value = new StringBuilder(MyC.MAXSTR);
value.Append(io.getNextChar());
token_id = T_UNKNOWN;
io.ReadChar();
}
skipWhite();
#if DEBUG
Console.WriteLine("[tok.scan tok=[" + this + "]");
#endif
}
/*
* parse the outerBlock seperately from inner block.
* specifically parse the declarations at the beginning of an outerblock
* the variable r tracks if the last statement was a return or not
*/
void blockOuter(String olabel, String ilabel)
{
bool r = false;
#if DEBUG
Console.WriteLine("blockOuter1 token=[" + tok + "]\n");
#endif
CommentToken(); /* mark the position in insn stream */
tok.scan();
#if DEBUG
Console.WriteLine("blockOuter2 token=[" + tok + "]\n");
#endif
declInner();
emit.LocalVars(localvar);
while (tok.getFirstChar() != '}')
{
#if DEBUG
Console.WriteLine("blockOuter3 token=[" + tok + "]\n");
#endif
if (io.EOF())
{
io.Abort("Expected statement, end of file encountered");
}
r = false;
switch (tok.getId())
{
case Tok.T_IF: fcIf(olabel, ilabel); continue; /* fcIf updates tok */
case Tok.T_WHILE: fcWhile(); break;
case Tok.T_FOR: fcFor(); break;
case Tok.T_BREAK: fcBreak(olabel); break;
case Tok.T_CONTINUE: fcContinue(ilabel); break;
case Tok.T_RETURN: fcReturn(); r = true; break;
default: statement(); break;
}
#if DEBUG
Console.WriteLine("blockOuter4 token=[" + tok + "]\n");
#endif
}
if (!r) /* if no outerscope return specified, try to default */
{
Var e = emit.GetFunc(); /* get function def */
if (e.getTypeId() != Tok.T_VOID) /* make sure we can default to void */
{
if (!e.getName().Equals("main")) /* is it not main? */
{
io.Abort("No return value specified for non void function");
}
emit.LoadConst("0"); /* special case a dummy ret value */
}
emit.Ret();
}
CommentToken(); /* mark the position in insn stream */
tok.scan(); /* read beyond end of block */
#if DEBUG
Console.WriteLine("blockOuter5 token=[" + tok + "]\n");
#endif
}
