If a certain memory leak (or other similar bug) found by the analyzer is known
to be happening only before abnormal termination of the program ("sink", eg.
assertion failure in the code under analysis, or another bug that introduces
undefined behavior), such leak warning is discarded. However, if the analysis
has never reaches completion (due to complexity of the code), it may be
failing to notice the sink.
This commit further extends the partial solution introduced in r290341 to cover
cases when a complicated control flow occurs before encountering a no-return
statement (which anyway inevitably leads to such statement(s)) by traversing
the respective section of the CFG in a depth-first manner. A complete solution
still seems elusive.
rdar://problem/28157554
Differential Revision: https://reviews.llvm.org/D35673
llvm-svn: 308957
Warnings with suppress-on-sink are discarded during FlushReports when
BugReporter notices that all paths in ExplodedGraph that pass through the
warning eventually run into a sink node.
However, suppress-on-sink fails to filter out false positives when the analysis
terminates too early - by running into analyzer limits, such as block count
limits or graph size limits - and the interruption hits the narrow window
between throwing the leak report and reaching the no-return function call. In
such case the report is there, however suppression-on-sink doesn't work, because
the sink node was never constructed in the incomplete ExplodedGraph.
This patch implements a very partial solution: also suppress reports thrown
against a statement-node that corresponds to a statement that belongs to a
no-return block of the CFG.
rdar://problem/28832541
Differential Revision: https://reviews.llvm.org/D28023
llvm-svn: 290341
Artem Dergachev