From 10c9227136c7a60188fb693858fc27d9d5c7887e Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.alekhin@intel.com>
Date: Mon, 23 Apr 2018 15:06:43 +0300
Subject: [PATCH] core: CV_Error with set_terminate() on Windows

To dump contents of the last OpenCV error
---
 modules/core/src/system.cpp | 77 ++++++++++++++++++++++++++++++++++++---------
 1 file changed, 62 insertions(+), 15 deletions(-)

diff --git a/modules/core/src/system.cpp b/modules/core/src/system.cpp
index eddb11f..f2f5f85 100644
--- a/modules/core/src/system.cpp
+++ b/modules/core/src/system.cpp
@@ -71,12 +71,26 @@ static bool param_dumpErrors = utils::getConfigurationParameterBool("OPENCV_DUMP
 
 } // namespace cv
 
+#ifndef CV_ERROR_SET_TERMINATE_HANDLER  // build config option
+# if defined(_WIN32)
+#   define CV_ERROR_SET_TERMINATE_HANDLER 1
+# endif
+#endif
+#if CV_ERROR_SET_TERMINATE_HANDLER == 0
+# undef CV_ERROR_SET_TERMINATE_HANDLER
+#endif
+
 #ifdef _MSC_VER
 # if _MSC_VER >= 1700
 #  pragma warning(disable:4447) // Disable warning 'main' signature found without threading model
 # endif
 #endif
 
+#ifdef CV_ERROR_SET_TERMINATE_HANDLER
+#include <exception>      // std::set_terminate
+#include <cstdlib>        // std::abort
+#endif
+
 #if defined __ANDROID__ || defined __linux__ || defined __FreeBSD__ || defined __HAIKU__
 #  include <unistd.h>
 #  include <fcntl.h>
@@ -925,28 +939,61 @@ int cv_vsnprintf(char* buf, int len, const char* fmt, va_list args)
 #endif
 }
 
+static void dumpException(const Exception& exc)
+{
+    const char* errorStr = cvErrorStr(exc.code);
+    char buf[1 << 12];
+
+    cv_snprintf(buf, sizeof(buf),
+        "OpenCV(%s) Error: %s (%s) in %s, file %s, line %d",
+        CV_VERSION,
+        errorStr, exc.err.c_str(), exc.func.size() > 0 ?
+        exc.func.c_str() : "unknown function", exc.file.c_str(), exc.line);
+#ifdef __ANDROID__
+    __android_log_print(ANDROID_LOG_ERROR, "cv::error()", "%s", buf);
+#else
+    fflush(stdout); fflush(stderr);
+    fprintf(stderr, "%s\n", buf);
+    fflush(stderr);
+#endif
+}
+
+#ifdef CV_ERROR_SET_TERMINATE_HANDLER
+static bool cv_terminate_handler_installed = false;
+static std::terminate_handler cv_old_terminate_handler;
+static cv::Exception cv_terminate_handler_exception;
+static bool param_setupTerminateHandler = utils::getConfigurationParameterBool("OPENCV_SETUP_TERMINATE_HANDLER", true);
+static void cv_terminate_handler() {
+    std::cerr << "OpenCV: terminate handler is called! The last OpenCV error is:\n";
+    dumpException(cv_terminate_handler_exception);
+    if (false /*cv_old_terminate_handler*/)  // buggy behavior is observed with doubled "abort/retry/ignore" windows
+        cv_old_terminate_handler();
+    abort();
+}
+
+#endif
+
 void error( const Exception& exc )
 {
+#ifdef CV_ERROR_SET_TERMINATE_HANDLER
+    {
+        cv::AutoLock lock(getInitializationMutex());
+        if (!cv_terminate_handler_installed)
+        {
+            if (param_setupTerminateHandler)
+                cv_old_terminate_handler = std::set_terminate(cv_terminate_handler);
+            cv_terminate_handler_installed = true;
+        }
+        cv_terminate_handler_exception = exc;
+    }
+#endif
+
     if (customErrorCallback != 0)
         customErrorCallback(exc.code, exc.func.c_str(), exc.err.c_str(),
                             exc.file.c_str(), exc.line, customErrorCallbackData);
     else if (param_dumpErrors)
     {
-        const char* errorStr = cvErrorStr(exc.code);
-        char buf[1 << 12];
-
-        cv_snprintf(buf, sizeof(buf),
-            "OpenCV(%s) Error: %s (%s) in %s, file %s, line %d",
-            CV_VERSION,
-            errorStr, exc.err.c_str(), exc.func.size() > 0 ?
-            exc.func.c_str() : "unknown function", exc.file.c_str(), exc.line);
-#ifdef __ANDROID__
-        __android_log_print(ANDROID_LOG_ERROR, "cv::error()", "%s", buf);
-#else
-        fflush(stdout); fflush(stderr);
-        fprintf(stderr, "%s\n", buf);
-        fflush(stderr);
-#endif
+        dumpException(exc);
     }
 
     if(breakOnError)
-- 
2.7.4