Adding upstream version 2.13.6.upstream/2.13.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/lib/base/stacktrace.cpp b/lib/base/stacktrace.cpp
new file mode 100644
index 0000000..e3f15ce
--- /dev/null
+++ b/lib/base/stacktrace.cpp
@@ -0,0 +1,43 @@
+/* Icinga 2 | (c) 2020 Icinga GmbH | GPLv2+ */
+
+#include <base/i2-base.hpp>
+#include "base/stacktrace.hpp"
+#include <iostream>
+#include <iomanip>
+#include <vector>
+
+#ifdef HAVE_BACKTRACE_SYMBOLS
+#	include <execinfo.h>
+#endif /* HAVE_BACKTRACE_SYMBOLS */
+
+using namespace icinga;
+
+std::ostream &icinga::operator<<(std::ostream &os, const StackTraceFormatter &f)
+{
+	/* In most cases, this operator<< just relies on the operator<< for the `boost::stacktrace::stacktrace` wrapped in
+	 * the `StackTraceFormatter`. But as this operator turned out to not work properly on some platforms, there is a
+	 * fallback implementation that can be enabled using the `-DICINGA2_STACKTRACE_USE_BACKTRACE_SYMBOLS` flag at
+	 * compile time. This will then switch to `backtrace_symbols()` from `<execinfo.h>` instead of the implementation
+	 * provided by Boost.
+	 */
+
+	const boost::stacktrace::stacktrace &stack = f.m_Stack;
+
+#ifdef ICINGA2_STACKTRACE_USE_BACKTRACE_SYMBOLS
+	std::vector<void *> addrs;
+	addrs.reserve(stack.size());
+	std::transform(stack.begin(), stack.end(), std::back_inserter(addrs), [](const boost::stacktrace::frame &f) {
+		return const_cast<void *>(f.address());
+	});
+
+	char **symbols = backtrace_symbols(addrs.data(), addrs.size());
+	for (size_t i = 0; i < addrs.size(); i++) {
+		os << std::setw(2) << i << "# " << symbols[i] << std::endl;
+	}
+	std::free(symbols);
+#else /* ICINGA2_STACKTRACE_USE_BACKTRACE_SYMBOLS */
+	os << stack;
+#endif /* ICINGA2_STACKTRACE_USE_BACKTRACE_SYMBOLS */
+
+	return os;
+}