Unnecessary "throws" declarations tend to cascade. If foo() calls
bar() and bar() falsely declares that it might throw IOException, that
often leads a programmer to declare that foo() might throw IOException
as well. Fixing the bar() throws declaration then reveals that we can
fix the foo() throws declaration too. By the time we reach a fixed
point with cleaning these up, we have removed roughly 320 unnecessary
throws declarations.
In a few cases, this cleanup even lets us remove entire "try
... catch" statements where the only thing being caught was an
exception that we now statically know cannot be thrown. Nice!
In Eclipse project configurations, upgrade any future such shenanigans
from warnings to errors. Now that we've fixed this, we don't want it
coming back again.
There is a potential drawback to this change. Conceivably some public
WALA API entry point might have declared that it could throw some
exception merely to reserve the *option* of throwing that exception in
third-party code that subclasses and overrides the API entry point in
question. I have no idea whether this is a significant concern in
practice, though.
If a method is private, there's no risk that a subclass elsewhere
might be overriding it and depending on dynamic dispatch to choose the
right implementation. So all of these private methods can safely be
declared static without risk of regression in either WALA code or
unseen third-party code.
1) extend ContextSelector interface to allow it to specify parameters of interest
2) extend filtering mechanism at call sites to allow CPA-style filtering when requested by contexts
3) various related fixes and extensions:
a) removed redundant code to handle dispatch for JavaScript, so now it shares the core mechanism
b) tighten types for operators that take an array of args - now the array is T[] at the cost of a few array allocation methods
c) a bit more support for empty int sets
d) void function objects
e) bug fixes for lexical scoping support, and adaptation to work with core dispatch mechanism
f) example of CPA-style sensitivity to handle nastiness in a JavaScript for(.. in ...) loop
git-svn-id: https://wala.svn.sourceforge.net/svnroot/wala/trunk@4150 f5eafffb-2e1d-0410-98e4-8ec43c5233c4
Ben Liblit
Manu Sridharan
Julian Dolby
Julian Dolby
Max Schaefer
Manu Sridharan
msridhar1
dolby-oss