Changes in v2:
- Rejigger testing, test on c++98 et al.
- Add tests for regular bitset<>::op[].
Perform __glibcxx_assert bounds check on indices to bitset<>::op[]
for const and non-const overloads.
Also, add previously neglected regular tests for bitset<>::op[].
libstdc++-v3/ChangeLog
PR libstdc++/118341
* include/std/bitset (operator[] (2x)): Add assertion.
* testsuite/20_util/bitset/access/118341_neg1.cc: New test.
* testsuite/20_util/bitset/access/118341_neg2.cc: Same.
* testsuite/20_util/bitset/access/118341_smoke.cc: Same.
* testsuite/20_util/bitset/access/subscript.cc: Same.
* testsuite/20_util/bitset/access/subscript_const_neg.cc: Same.
---
libstdc++-v3/include/std/bitset | 10 ++++--
.../20_util/bitset/access/118341_neg1.cc | 14 +++++++++
.../20_util/bitset/access/118341_neg2.cc | 14 +++++++++
.../20_util/bitset/access/118341_smoke.cc | 31 +++++++++++++++++++
.../20_util/bitset/access/subscript.cc | 28 +++++++++++++++++
.../bitset/access/subscript_const_neg.cc | 15 +++++++++
6 files changed, 110 insertions(+), 2 deletions(-)
create mode 100644 libstdc++-v3/testsuite/20_util/bitset/access/118341_neg1.cc
create mode 100644 libstdc++-v3/testsuite/20_util/bitset/access/118341_neg2.cc
create mode 100644 libstdc++-v3/testsuite/20_util/bitset/access/118341_smoke.cc
create mode 100644 libstdc++-v3/testsuite/20_util/bitset/access/subscript.cc
create mode 100644
libstdc++-v3/testsuite/20_util/bitset/access/subscript_const_neg.cc
diff --git a/libstdc++-v3/include/std/bitset b/libstdc++-v3/include/std/bitset
index 331d0894342..eb200ab9246 100644
--- a/libstdc++-v3/include/std/bitset
+++ b/libstdc++-v3/include/std/bitset
@@ -1290,11 +1290,17 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
_GLIBCXX23_CONSTEXPR
reference
operator[](size_t __position)
- { return reference(*this, __position); }
+ {
+ __glibcxx_assert(__position < _Nb);
+ return reference(*this, __position);
+ }
_GLIBCXX_CONSTEXPR bool
operator[](size_t __position) const
- { return _Unchecked_test(__position); }
+ {
+ __glibcxx_assert(__position < _Nb);
+ return _Unchecked_test(__position);
+ }
///@}
/**
diff --git a/libstdc++-v3/testsuite/20_util/bitset/access/118341_neg1.cc
b/libstdc++-v3/testsuite/20_util/bitset/access/118341_neg1.cc
new file mode 100644
index 00000000000..22991ffac91
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/bitset/access/118341_neg1.cc
@@ -0,0 +1,14 @@
+// { dg-do run { xfail *-*-* } }
+// { dg-options "-D_GLIBCXX_ASSERTIONS" }
+
+#include <bitset>
+#include <testsuite_hooks.h>
+
+// Check bitset<>::op[] hardening, non-const.
+
+int main()
+{
+ std::bitset<13> bs(0x1555ull);
+ bs[12]; // OK
+ bs[13]; // aborts, 13 > 12, non-const
+}
diff --git a/libstdc++-v3/testsuite/20_util/bitset/access/118341_neg2.cc
b/libstdc++-v3/testsuite/20_util/bitset/access/118341_neg2.cc
new file mode 100644
index 00000000000..fa8942ec510
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/bitset/access/118341_neg2.cc
@@ -0,0 +1,14 @@
+// { dg-do run { xfail *-*-* } }
+// { dg-options "-D_GLIBCXX_ASSERTIONS" }
+
+#include <bitset>
+#include <testsuite_hooks.h>
+
+// Check bitset<>::op[] hardening, const.
+
+int main()
+{
+ const std::bitset<13> bs(0x1555ull);
+ bs[12]; // OK
+ bs[13]; // aborts, 13 > 12, const
+}
diff --git a/libstdc++-v3/testsuite/20_util/bitset/access/118341_smoke.cc
b/libstdc++-v3/testsuite/20_util/bitset/access/118341_smoke.cc
new file mode 100644
index 00000000000..0a525c1b3fa
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/bitset/access/118341_smoke.cc
@@ -0,0 +1,31 @@
+// { dg-do run }
+// { dg-options "-D_GLIBCXX_ASSERTIONS" }
+
+// Smoke test, op[] hardening.
+
+#include <bitset>
+#include <testsuite_hooks.h>
+
+void test_non_const_subscript()
+{
+ std::bitset<13> bs(0x1555ull);
+ for (int i = 0; i < 13; ++i)
+ {
+ VERIFY(bs[i] != (i & 1)); // Check op[] proxy result rvalue.
+ bs[i] = not bs[i]; // Assign via op[] proxy result lvalue.
+ VERIFY(bs[i] == (i & 1)); // Check modified.
+ }
+}
+
+void test_const_subscript()
+{
+ const std::bitset<13> cbs(0x1555ull);
+ for (int i = 0; i < 13; ++i)
+ VERIFY(cbs[i] != (i & 1)); // Check op[] proxy result const rvalue.
+}
+
+int main()
+{
+ test_non_const_subscript();
+ test_const_subscript();
+}
diff --git a/libstdc++-v3/testsuite/20_util/bitset/access/subscript.cc
b/libstdc++-v3/testsuite/20_util/bitset/access/subscript.cc
new file mode 100644
index 00000000000..4bcf6e3d530
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/bitset/access/subscript.cc
@@ -0,0 +1,28 @@
+// { dg-do run }
+
+#include <bitset>
+#include <testsuite_hooks.h>
+
+void test_non_const_subscript()
+{
+ std::bitset<13> bs(0x1555ull);
+ for (int i = 0; i < 13; ++i)
+ {
+ VERIFY(bs[i] != (i & 1)); // Check op[] proxy result rvalue.
+ bs[i] = not bs[i]; // Assign via op[] proxy result lvalue.
+ VERIFY(bs[i] == (i & 1)); // Check modified.
+ }
+}
+
+void test_const_subscript()
+{
+ const std::bitset<13> cbs(0x1555ull);
+ for (int i = 0; i < 13; ++i)
+ VERIFY(cbs[i] != (i & 1)); // Check op[] proxy result const rvalue.
+}
+
+int main()
+{
+ test_non_const_subscript();
+ test_const_subscript();
+}
diff --git
a/libstdc++-v3/testsuite/20_util/bitset/access/subscript_const_neg.cc
b/libstdc++-v3/testsuite/20_util/bitset/access/subscript_const_neg.cc
new file mode 100644
index 00000000000..00ed36196f8
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/bitset/access/subscript_const_neg.cc
@@ -0,0 +1,15 @@
+// { dg-do compile
+
+#include <bitset>
+
+void test_const_subscript_assignment()
+{
+ const std::bitset<13> bs(0x1555ull);
+ for (int i = 0; i < 13; ++i)
+ bs[i] = not bs[i]; // { dg-error "lvalue required" }
+}
+
+int main()
+{
+ test_const_subscript_assignment();
+}
--
2.52.0
