Extract Backtrace out of SafePtr as a general utility

1 files changed, 56 insertions, 0 deletions

diff --git a/src/backtrace.cc b/src/backtrace.cc
new file mode 100644
index 00000000..f7be9f76
--- /dev/null
+++ b/src/backtrace.cc
@@ -0,0 +1,56 @@
+#include "backtrace.hh"
+
+#include <string.h>
+#include <stdlib.h>
+
+#if defined(__linux__) || defined(__APPLE__)
+# include <execinfo.h>
+#elif defined(__CYGWIN__)
+# include <windows.h>
+#endif
+
+namespace Kakoune
+{
+
+Backtrace::Backtrace()
+{
+    #if defined(__linux__) || defined(__APPLE__)
+    num_frames = backtrace(stackframes, max_frames);
+    #elif defined(__CYGWIN__)
+    num_frames = CaptureStackBackTrace(0, max_frames, stackframes, nullptr);
+    #endif
+}
+
+const char* Backtrace::desc() const
+{
+    #if defined(__linux__) || defined(__APPLE__)
+    char** symbols = backtrace_symbols(stackframes, num_frames);
+    int size = 0;
+    for (int i = 0; i < num_frames; ++i)
+        size += strlen(symbols[i]) + 1;
+
+    char* res = (char*)malloc(size+1);
+    res[0] = 0;
+    for (int i = 0; i < num_frames; ++i)
+    {
+        strcat(res, symbols[i]);
+        strcat(res, "\n");
+    }
+    free(symbols);
+    return res;
+    #elif defined(__CYGWIN__)
+    char* res = (char*)malloc(num_frames * 20);
+    res[0] = 0;
+    for (int i = 0; i < num_frames; ++i)
+    {
+        char addr[20];
+        snprintf(addr, 20, "0x%p", stackframes[i]);
+        strcat(res, addr);
+    }
+    return res;
+    #else
+    return "<not implemented>";
+    #endif
+}
+
+}