s

Author: Dimitri Rusin

include/ioh/common/factory.hpp

@@ -3,13 +3,16 @@
 #include <algorithm>
 #include <cassert>
 #include <cstdlib>
+#include <execinfo.h>
 #include <functional>
 #include <iostream>
 #include <map>
 #include <memory>
 #include <optional>
+#include <signal.h>
 #include <string>
 #include <type_traits>
+#include <unistd.h>
 #include <utility>
 #include <vector>
 
@@ -58,6 +61,79 @@ namespace ioh::problem
     };
 } // namespace ioh::problem
 
+
+
+
+void print_backtrace() {
+    const int max_frames = 64;
+    void* addrlist[max_frames + 1];
+
+    // retrieve current stack addresses
+    int addrlen = backtrace(addrlist, sizeof(addrlist) / sizeof(void*));
+
+    if (addrlen == 0) {
+        std::cerr << "  <empty, possibly corrupt>\n";
+        return;
+    }
+
+    // resolve addresses into strings containing "filename(function+address)",
+    // this array must be free()-ed
+    char** symbollist = backtrace_symbols(addrlist, addrlen);
+
+    // allocate string which will be filled with the demangled function name
+    size_t funcnamesize = 256;
+    char* funcname = (char*)malloc(funcnamesize);
+
+    // iterate over the returned symbol lines. skip the first, it is the
+    // address of this function.
+    for (int i = 1; i < addrlen; i++) {
+        char *begin_name = nullptr, *begin_offset = nullptr, *end_offset = nullptr;
+
+        // find parentheses and +address offset surrounding the mangled name
+        for (char *p = symbollist[i]; *p; ++p) {
+            if (*p == '(')
+                begin_name = p;
+            else if (*p == '+')
+                begin_offset = p;
+            else if (*p == ')' && begin_offset) {
+                end_offset = p;
+                break;
+            }
+        }
+
+        if (begin_name && begin_offset && end_offset && begin_name < begin_offset) {
+            *begin_name++ = '\0';
+            *begin_offset++ = '\0';
+            *end_offset = '\0';
+
+            // mangle the function name
+            int status;
+            char* ret = abi::__cxa_demangle(begin_name, funcname, &funcnamesize, &status);
+            if (status == 0) {
+                funcname = ret; // use possibly realloc()-ed string
+                std::cerr << "  " << symbollist[i] << " : " << funcname << "+" << begin_offset << "\n";
+            } else {
+                // demangling failed, output function name as a C function with no arguments
+                std::cerr << "  " << symbollist[i] << " : " << begin_name << "()+" << begin_offset << "\n";
+            }
+        } else {
+            // couldn't parse the line, print the whole line
+            std::cerr << "  " << symbollist[i] << "\n";
+        }
+    }
+
+    free(funcname);
+    free(symbollist);
+}
+
+
+
+
+
+
+
+
+
 namespace ioh::common
 {
 
@@ -142,11 +218,8 @@ namespace ioh::common
 
             if (already_defined) {
                 std::string error_message = "Error: The name '" + name + "' has already been defined in the factory.";
-
-                // Output the error message to both std::cerr and std::cout
                 std::cerr << error_message << std::endl;
-                std::cout << error_message << std::endl;
-
+                print_backtrace(); // Print the backtrace here
                 assert(!already_defined && name.c_str());
             }