GeneralException() will now trace the callstack and store this, for debugging purposes.

1 files changed, 81 insertions, 0 deletions

diff --git a/src/Exceptions.cc b/src/Exceptions.cc
new file mode 100644
index 0000000..94de408
--- /dev/null
+++ b/src/Exceptions.cc
@@ -0,0 +1,81 @@
+#include "Exceptions.h"
+
+#define MAXTRACE 128
+
+#ifdef _WIN32
+
+#include <windows.h>
+
+void Balau::GeneralException::genTrace() {
+    // taken from http://stackoverflow.com/questions/5693192/win32-backtrace-from-c-code
+    unsigned int   i;
+    void         * stack[MAXTRACE];
+    unsigned short frames;
+    SYMBOL_INFO  * symbol;
+    HANDLE         process;
+
+    process = GetCurrentProcess();
+
+    SymInitialize(process, NULL, TRUE);
+
+    frames               = CaptureStackBackTrace(0, MAXTRACE, stack, NULL);
+    symbol               = (SYMBOL_INFO *) calloc(sizeof(SYMBOL_INFO) + 256 * sizeof(char), 1);
+    symbol->MaxNameLen   = 255;
+    symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
+
+    for (i = 0; i < frames; i++) {
+        SymFromAddr(process, (DWORD64)(stack[i]), 0, symbol);
+
+        int status;
+        String line;
+        char * demangled = abi::__cxa_demangle(symbol->Name, 0, 0, &status);
+        line.set("%i: 0x%08x (%s)", i, symbol->Address, status == 0 ? demangled : symbol->Name);
+        free(demangled);
+        m_trace.push_back(line);
+    }
+
+    free(symbol);
+}
+
+#else
+
+#include <execinfo.h>
+#include <dlfcn.h>
+
+void Balau::GeneralException::genTrace() {
+    void * trace[MAXTRACE];
+    int n = backtrace(trace, MAXTRACE);
+    char ** symbols = backtrace_symbols(trace, MAXTRACE);
+
+    if (!symbols)
+        return;
+
+    String line;
+    for (int i = 0; i < n; i++)
+        line += String().set("%08x ", trace[i]);
+
+    m_trace.push_back(line);
+    Dl_info info;
+
+    for (int i = 0; i < n; i++) {
+        int status;
+        String line;
+        dladdr(trace[i], &info);
+        long dist = ((char *) trace[i]) - ((char *) info.dli_saddr);
+        char * demangled;
+        if (info.dli_sname) {
+            demangled = abi::__cxa_demangle(info.dli_sname, 0, 0, &status);
+        } else {
+            demangled = NULL;
+        }
+        line.set("%i: %s(%s%c0x%x) [0x%08x]", i, info.dli_fname, info.dli_sname ? (demangled ? (status == 0 ? demangled : info.dli_sname) : info.dli_sname) : "??", dist < 0 ? '-' : '+', dist < 0 ? -dist : dist, trace[i]);
+        m_trace.push_back(line);
+        if (demangled)
+            free(demangled);
+    }
+
+    free(symbols);
+}
+
+
+#endif