Print stack trace upon exceptions

Useful for debugging users' logs

src/common/CMakeLists.txt

@@ -31,6 +31,7 @@ set(common_sources
   command_line.cpp
   dns_utils.cpp
   util.cpp
+  exception.cpp
   i18n.cpp)
 
 set(common_headers)
@@ -48,6 +49,7 @@ set(common_private_headers
   unordered_containers_boost_serialization.h
   util.h
   varint.h
+  exception.h
   i18n.h)
 
 bitmonero_private_headers(common
@@ -60,6 +62,7 @@ target_link_libraries(common
   LINK_PRIVATE
     crypto
     ${UNBOUND_LIBRARY}
+    ${LIBUNWIND_LIBRARIES}
     ${Boost_DATE_TIME_LIBRARY}
     ${Boost_FILESYSTEM_LIBRARY}
     ${Boost_SYSTEM_LIBRARY}

src/common/exception.cpp

@@ -0,0 +1,84 @@
+// Copyright (c) 2016, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "common/exception.h"
+#include "misc_log_ex.h"
+#define UNW_LOCAL_ONLY
+#include <libunwind.h>
+#include <cxxabi.h>
+
+namespace tools
+{
+
+void log_stack_trace(const char *msg)
+{
+#ifdef HAVE_LIBUNWIND
+  unw_context_t ctx;
+  unw_cursor_t cur;
+  unw_word_t ip, off;
+  unsigned level;
+  char sym[512], *dsym;
+  int status;
+
+  if (msg)
+    LOG_PRINT_L0(msg);
+  LOG_PRINT_L0("Unwinded call stack:");
+  if (unw_getcontext(&ctx) < 0) {
+    LOG_PRINT_L0("Failed to create unwind context");
+    return;
+  }
+  if (unw_init_local(&cur, &ctx) < 0) {
+    LOG_PRINT_L0("Failed to find the first unwind frame");
+    return;
+  }
+  for (level = 1; level < 999; ++level) { // 999 for safety
+    int ret = unw_step(&cur);
+    if (ret < 0) {
+      LOG_PRINT_L0("Failed to find the next frame");
+      return;
+    }
+    if (ret == 0)
+      break;
+    if (unw_get_reg(&cur, UNW_REG_IP, &ip) < 0) {
+      LOG_PRINT_L0("  " << std::setw(4) << level);
+      continue;
+    }
+    if (unw_get_proc_name(&cur, sym, sizeof(sym), &off) < 0) {
+      LOG_PRINT_L0("  " << std::setw(4) << level << std::setbase(16) << std::setw(20) << "0x" << ip);
+      continue;
+    }
+    dsym = abi::__cxa_demangle(sym, NULL, NULL, &status);
+    LOG_PRINT_L0("  " << std::setw(4) << level << std::setbase(16) << std::setw(20) << "0x" << ip << " " << (!status && dsym ? dsym : sym) << " + " << "0x" << off);
+    free(dsym);
+  }
+#else
+#warning libunwind disabled, no stack traces
+#endif
+}
+
+}  // namespace tools

src/common/exception.h

@@ -0,0 +1,53 @@
+// Copyright (c) 2016, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef MONERO_EXCEPTION_H
+#define MONERO_EXCEPTION_H
+
+#include <stdexcept>
+#include <string>
+
+namespace tools
+{
+
+void log_stack_trace(const char *msg);
+
+class exception: public std::exception {
+public:
+  exception() { log_stack_trace(what()); }
+};
+
+class runtime_error: public std::runtime_error {
+public:
+  explicit runtime_error(const std::string &s): std::runtime_error(s) { log_stack_trace(what()); }
+  explicit runtime_error(const char *s): std::runtime_error(s) { log_stack_trace(what()); }
+};
+
+}  // namespace tools
+
+#endif