FMSLogo Code

Add a mitigation for bug #1454113; Using COPYDEF of OUTPUT can crash.

The fix was copied in from UCBLogo, but that fix leaks memory. The problem is that the code doesn't "re-treeify" a body node if the definition of a function changes in mid-execution, which could crash if the definition changed in a significant way for tree-ification (such going from undefined to defined, or changing the number of inputs).

UCBLogo "leaks" the tree-ificiation of the procedure, which is not a problem for UCBLogo, because it has true garbage collection. But this results in a very significant memory leak for FMSLogo. My stop-gap fix for this memory leak is to untree-ify the procedure after it is executed. Unfortunately, this means that the original bug still exists for functions that are tree-recursive (non-tail recursive) because once the inner call exits, the outer call becomes untree-ified and can no longer handle having a procedure change.

Since the current change reduces the scope of the bug, I am checking it in. I'm not sure what the final fix will be-it may either be a reference count on the tree-ification or simply to keep the tree-ification around for the lifetime of the procedure.

Add benchmarks for running tail-recursive and non-tail recursive procedures.

Add a regression test for bug #1552426, which crashes.

Add some tests that are intended to test the evaluator.

Add function comment for parser_iterate().

Add a phony target to copy the HTML to a directory that is suitable for publishing on SourceForge.

Move the values of "html.stylesheet" and "html.stylesheet.type" XSL string parameters from the Makefile to the XSL files, now that I know how to specify them. I would have done this from the beginning, but I didn't understand the difference between specifing a number template parameter and a string template parameter.

Remove leading whitespace from within <programlisting> tags.

Extraneous whitespace became important when I started using CSS for the HTML output. Now that I shade examples in grey, any extraneous newlines is very apparent (and looks amateur-ish).

Note some of the improvements that were made to the online manual.

Change the way the .PDF file is generated to use XSLT and FO, instead of using jade and DSSSL.

This fixes bug #1432655; logohelp.pdf has strange indentation of examples