Default functions like print()

[timwaterman]

Print is weird. I have a skeleton set up inside the semantic analyzer for it, but we need to nail down its arguments. We have 3 options:
-Let it only take in Strings
-Let it take in any type, and have a new "polymorphic" type to compensate
-Let it keep using printf args, and try to figure out how to type check variadic functions in our own type checker (seems really hard, so lets not do this one)

[danhcole]

So, right now print is set up to be 'psudo-polymorphic'. When the semantic analyzer checks a function call, if the call is named 'print', it handles it specially. If the type is an int, float, char or string, it passes it, otherwise it throws an exception.

In the generator, when it prints the call, if the call is to print, it manually inserts the correct printf statement.

Right now, this only works with ints. If you pull the current code, and run the test suite, the first four or five tests pass. When the suite gets to the 'hello world' test, it fails. I need to go in and add type-checking to the generator, to correctly format the printf statements, which shouldn't be too hard to do. Something similar can be done for other built-in's.

[danhcole]

Now works for int, float, char, string and id. Still needs other exprs

[danhcole]

Works for all other exprs. All tests up to and including ops1.stch work.