Author: ericwf
Date: Wed Dec 23 00:35:25 2015
New Revision: 256322
URL: http://llvm.org/viewvc/llvm-project?rev=256322&view=rev
Log:
Fix PR25898 - Check for incomplete pointers types in can_catch(...)
Added:
libcxxabi/trunk/test/incomplete_type.sh.cpp
Modified:
libcxxabi/trunk/src/private_typeinfo.cpp
Modified: libcxxabi/trunk/src/private_typeinfo.cpp
URL:
http://llvm.org/viewvc/llvm-project/libcxxabi/trunk/src/private_typeinfo.cpp?rev=256322&r1=256321&r2=256322&view=diff
==============================================================================
--- libcxxabi/trunk/src/private_typeinfo.cpp (original)
+++ libcxxabi/trunk/src/private_typeinfo.cpp Wed Dec 23 00:35:25 2015
@@ -34,9 +34,12 @@
//
// _LIBCXX_DYNAMIC_FALLBACK is currently off by default.
+
+#include <string.h>
+
+
#ifdef _LIBCXX_DYNAMIC_FALLBACK
#include "abort_message.h"
-#include <string.h>
#include <sys/syslog.h>
#endif
@@ -57,31 +60,19 @@ namespace __cxxabiv1
#pragma GCC visibility push(hidden)
-#ifdef _LIBCXX_DYNAMIC_FALLBACK
-
inline
bool
is_equal(const std::type_info* x, const std::type_info* y, bool use_strcmp)
{
+#ifndef _WIN32
if (!use_strcmp)
return x == y;
return strcmp(x->name(), y->name()) == 0;
-}
-
-#else // !_LIBCXX_DYNAMIC_FALLBACK
-
-inline
-bool
-is_equal(const std::type_info* x, const std::type_info* y, bool)
-{
-#ifndef _WIN32
- return x == y;
#else
return (x == y) || (strcmp(x->name(), y->name()) == 0);
-#endif
+#endif
}
-#endif // _LIBCXX_DYNAMIC_FALLBACK
// __shim_type_info
@@ -351,8 +342,17 @@ bool
__pbase_type_info::can_catch(const __shim_type_info* thrown_type,
void*&) const
{
- return is_equal(this, thrown_type, false) ||
- is_equal(thrown_type, &typeid(std::nullptr_t), false);
+ if (is_equal(thrown_type, &typeid(std::nullptr_t), false)) return true;
+ bool use_strcmp = this->__flags & (__incomplete_class_mask |
+ __incomplete_mask);
+ if (!use_strcmp) {
+ const __pbase_type_info* thrown_pbase = dynamic_cast<const
__pbase_type_info*>(
+ thrown_type);
+ if (!thrown_pbase) return false;
+ use_strcmp = thrown_pbase->__flags & (__incomplete_class_mask |
+ __incomplete_mask);
+ }
+ return is_equal(this, thrown_type, use_strcmp);
}
#ifdef __clang__
Added: libcxxabi/trunk/test/incomplete_type.sh.cpp
URL:
http://llvm.org/viewvc/llvm-project/libcxxabi/trunk/test/incomplete_type.sh.cpp?rev=256322&view=auto
==============================================================================
--- libcxxabi/trunk/test/incomplete_type.sh.cpp (added)
+++ libcxxabi/trunk/test/incomplete_type.sh.cpp Wed Dec 23 00:35:25 2015
@@ -0,0 +1,83 @@
+//===------------------------- incomplete_type.cpp
--------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// http://mentorembedded.github.io/cxx-abi/abi.html#rtti-layout
+
+// Two abi::__pbase_type_info objects can always be compared for equality
+// (i.e. of the types represented) or ordering by comparison of their name
+// NTBS addresses. In addition, unless either or both have either of the
+// incomplete flags set, equality can be tested by comparing the type_info
+// addresses.
+
+// RUN: %cxx %compile_flags -c %s -o %t.one.o
+// RUN: %cxx %compile_flags -c %s -o %t.two.o -DTU_ONE
+// RUN: %cxx %link_flags -o %t.exe %t.one.o %t.two.o
+// RUN: %t.exe
+
+#include <stdio.h>
+#include <cassert>
+#include <typeinfo>
+
+struct NeverDefined;
+void ThrowNeverDefined();
+
+struct IncompleteAtThrow;
+void ThrowIncomplete();
+std::type_info const& ReturnTypeInfoIncomplete();
+
+struct CompleteAtThrow;
+void ThrowComplete();
+std::type_info const& ReturnTypeInfoComplete();
+
+void ThrowNullptr();
+
+#ifndef TU_ONE
+
+void ThrowNeverDefined() { throw (int NeverDefined::*)nullptr; }
+
+void ThrowIncomplete() { throw (int IncompleteAtThrow::*)nullptr; }
+std::type_info const& ReturnTypeInfoIncomplete() { return typeid(int
IncompleteAtThrow::*); }
+
+struct CompleteAtThrow {};
+void ThrowComplete() { throw (int CompleteAtThrow::*)nullptr; }
+std::type_info const& ReturnTypeInfoComplete() { return typeid(int
CompleteAtThrow::*); }
+
+void ThrowNullptr() { throw nullptr; }
+
+#else
+
+struct IncompleteAtThrow {};
+
+int main() {
+ assert(ReturnTypeInfoIncomplete() != typeid(int IncompleteAtThrow::*));
+ try {
+ ThrowIncomplete();
+ } catch (int IncompleteAtThrow::*) {}
+
+ assert(ReturnTypeInfoComplete() != typeid(int CompleteAtThrow::*));
+ try {
+ ThrowComplete();
+ } catch (int CompleteAtThrow::*) {}
+
+#if __cplusplus >= 201103L
+ // Catch nullptr as complete type
+ try {
+ ThrowNullptr();
+ } catch (int IncompleteAtThrow::*) {}
+
+ // Catch nullptr as an incomplete type
+ try {
+ ThrowNullptr();
+ } catch (int CompleteAtThrow::*) {}
+ // Catch nullptr as a type that is never complete.
+ try {
+ ThrowNeverDefined();
+ } catch (int NeverDefined::*) {}
+#endif
+}
+#endif
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