skia2/tests/BitSetTest.cpp
John Stiles 7d3f089e58 Fix use-after-free error discovered by the fuzzer.
When eliminating a CFG node, we now flag its exit nodes; if our
optimization pass reaches one of those flagged nodes, we stop the
current optimization process in its tracks and initiate a rescan.

We do NOT recursively mark the exits of the exit nodes, so this fix is
reliant on the CFG being ordered in a non-chaotic fashion, but in
practice this seems to be sufficient for the CFGs we generate today.

Change-Id: I892805361c5f4297e02146f37a759dfda83f5488
Bug: oss-fuzz:26942
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/331597
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2020-11-03 17:59:02 +00:00

63 lines
2.1 KiB
C++

/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/utils/SkBitSet.h"
#include "tests/Test.h"
#include <vector>
DEF_TEST(BitSet, reporter) {
SkBitSet set0(65536);
REPORTER_ASSERT(reporter, set0.size() == 65536);
REPORTER_ASSERT(reporter, set0.test(0) == false);
REPORTER_ASSERT(reporter, set0.test(32767) == false);
REPORTER_ASSERT(reporter, set0.test(65535) == false);
REPORTER_ASSERT(reporter, !set0.findFirst());
set0.set(22);
REPORTER_ASSERT(reporter, set0.test(22) == true);
REPORTER_ASSERT(reporter, set0.findFirst());
REPORTER_ASSERT(reporter, *set0.findFirst() == 22);
set0.set(24);
REPORTER_ASSERT(reporter, set0.test(24) == true);
REPORTER_ASSERT(reporter, *set0.findFirst() == 22);
set0.set(35); // on a different DWORD
REPORTER_ASSERT(reporter, set0.test(35) == true);
REPORTER_ASSERT(reporter, *set0.findFirst() == 22);
REPORTER_ASSERT(reporter, set0.test(24) == true);
REPORTER_ASSERT(reporter, set0.test(35) == true);
set0.set(21);
REPORTER_ASSERT(reporter, set0.test(21) == true);
REPORTER_ASSERT(reporter, *set0.findFirst() == 21);
set0.reset(21);
REPORTER_ASSERT(reporter, set0.test(21) == false);
REPORTER_ASSERT(reporter, *set0.findFirst() == 22);
std::vector<unsigned int> data;
set0.forEachSetIndex([&data](unsigned v) { data.push_back(v); });
REPORTER_ASSERT(reporter, data.size() == 3);
REPORTER_ASSERT(reporter, data[0] == 22);
REPORTER_ASSERT(reporter, data[1] == 24);
REPORTER_ASSERT(reporter, data[2] == 35);
SkBitSet set1(65536);
set1.set(12345);
REPORTER_ASSERT(reporter, set0.test(12345) == false);
REPORTER_ASSERT(reporter, set1.test(12345) == true);
REPORTER_ASSERT(reporter, set1.test(22) == false);
REPORTER_ASSERT(reporter, set0.test(35) == true);
set0.reset();
REPORTER_ASSERT(reporter, !set0.findFirst());
REPORTER_ASSERT(reporter, set0.test(1234) == false);
set0.set();
REPORTER_ASSERT(reporter, !set0.findFirstUnset());
REPORTER_ASSERT(reporter, set0.test(5678) == true);
}