In certain cases, one may want to ignore inter-procedural control
dependence. Consider the following example:
flag = getFlagVal();
if (flag) {
doStuff();
}
If we are ignoring interprocedural control dependence, a forward slice
from the first statement will *not* include statements inside doStuff()
and its transitive callees.
This option is useful in scenarios where the effects of statements
inside control-dependent callees can be accounted for via some cheaper
effect analysis. E.g., if you only care about heap effects of control-
dependent callees, you can compute that using mod-ref analysis,
rather than sucking all the control-dependent callee statements into the
slice.
Also added some more detailed comments, a new unit test, and removed
some trailing whitespace.
In the cases addressed here, the caught exception was being "handled"
by throwing some new exception. Instead of discarding the old
exception, pass it to the new exception's constructor to indicate the
original cause of the newly-created exception. This practice, called
"exception chaining", can often be useful in debugging.
This fixes the remaining 34 Eclipse "Resource '...' should be managed
by try-with-resource" warnings that were still left after the previous
commit.
Unlike the fixes in that previous commit, the changes here are *not*
plugging potential resource leaks. However, in many cases that is
simply because the code before the close() call cannot currently throw
exceptions. If exceptions became possible in the future, leaks could
result. Using try-with-resource preemptively avoids that.
Furthermore, in code that was already dealing with exceptions, the
try-with-resource style is usually considerably simpler.
This fixes 33 out of 37 Eclipse "Potential resource leak: '...' may
not be closed" warnings. It also fixes 3 out of 37 Eclipse "Resource
'...' should be managed by try-with-resource" warnings, although that
was not the main focus of this effort.
The remaining 4 warnings about potential resource leaks all involve a
leaked JarFile instance that is passed to a JarFileModule constructor
call. JarFileModile never attempts to close its underlying JarFile;
this code is written as though JarFile cleanup were the caller's
responsibility. However, the JarFile often cannot be closed by the
code that creates the JarFileModule either, since the JarFile needs to
remain open while the JarFileModule is in use, and some of these
JarFileModules stay around beyond the lifetime of the code that
created them. Truly fixing this would essentially require making
JarFileModule implement Closeable, which in turn would probably
require that Module implement Closeable, which in turn would require
changes to lots of code that deals with Module instances to arrange
for them to be properly closed. That's more invasive than I'm
prepared to take on right now.
Instead, rely on Java's ability to infer type parameters in many
contexts. This removes 665 Eclipse warnings.
Note: a few of these changes are to files under "test" subdirectories.
Presumably those are files that serve as test inputs rather than being
part of WALA code proper. As far as I can tell, these changes do not
break any WALA tests. But if any of those tests were specifically
intended to exercise WALA on code with non-inferred generic type
parameters, then I really should be leaving those alone.
The contents of @author go straight into HTML, just like most other
Javadoc material. So if you want to have a "<foo@bar.com>" e-mail
address as part of the author information, the angle brackets must be
escaped. Here I've opted to do that using "{@code <foo@bar.com>}",
which has some additional styling effects that seem appropriate for
e-mail addresses. We could also have used "<foo@bar.com>" for
escaping without code styling.
PrunedCFG had been changed to always include an entry and exit node.
The logic for detecting an "empty" ExceptionPrunedCFG inside the PDG
construction code had not been updated appropriately.
a) serializable added for use by Android services
b) test classes refactored to allow Android variants to use JUnit 3
2) shrike instrumentation now uses java.lang.instrument
a) refactoring
b) online variants of call graph tracing
analysis now understands and propagates MethodHandle objects
fixes to Shrike InvokeDynamic instruction
Former-commit-id: fb826f124423bcbca08f729cee1794fbda711d16
Manu Sridharan
Ben Liblit
Julian Dolby
Manu Sridharan
Martin Hecker
Julian Dolby
Andreas Sewe
steohan
Stephan Gocht
Manu Sridharan
Cosmin Radoi
Juergen Graf
Michael Heilmann