Save xref information to fasls.
This is done by faking it. The file being compiled is compiled as usual, but we append fake forms to the file as if they came from the file. These fake forms insert the necessary information into the xref databases when the fasl is loaded. To support this feature, we also updated COMPILE-FILE to recognize the :xref keyword arg. Set this to non-NIL to enable computing and saving xref information. code/exports.lisp: o Update XREF exports compiler/fndb.lisp: o Update with new definition of COMPILE-FILE. compiler/main.lisp: o Append fake forms to the file being compiled to save xref information to the fasl. This clears out any xref info we might have for the file, and inserts the necessary xref information into the database. o Add :XREF keyword arg to COMPILE-FILE. Default value of :XREF is C::*RECORD-XREF-INFO*. compiler/xref.lisp: o Add function to invalidate xref info for a given namestring, so we can reset the info when a fasl with xref info is loaded. o Add a function to find all xref information for a given pathname. Used for saving xref info to a fasl.
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