Send crash notification when flipper cpp exceptions are suppressed

Summary: This diff adds support to send crash notification whenever the cpp exception of Flipper is suppressed. Also updated the tests regarding the same

Reviewed By: jknoxville

Differential Revision: D13635822

fbshipit-source-id: 01e4a57c391476e5b044e64946d337cb4582a527

xplat/Flipper/utils/CallstackHelper.h

@@ -0,0 +1,63 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the LICENSE
+ * file in the root directory of this source tree.
+ */
+#if FB_SONARKIT_ENABLED
+
+#include <dlfcn.h>
+#include <unwind.h>
+#include <iomanip>
+
+namespace facebook {
+namespace flipper {
+// TODO: T39093653, Replace the backtrace implementation with folly
+// implementation. Didn't use the backtrace() c function as it was not found in
+// NDK.
+struct BacktraceState {
+  void** current;
+  void** end;
+};
+
+static _Unwind_Reason_Code unwindCallback(
+    struct _Unwind_Context* context,
+    void* arg) {
+  BacktraceState* state = static_cast<BacktraceState*>(arg);
+  uintptr_t pc = _Unwind_GetIP(context);
+  if (pc) {
+    if (state->current == state->end) {
+      return _URC_END_OF_STACK;
+    } else {
+      *state->current++ = reinterpret_cast<void*>(pc);
+    }
+  }
+  return _URC_NO_REASON;
+}
+
+static size_t captureBacktrace(void** buffer, size_t max) {
+  BacktraceState state = {buffer, buffer + max};
+  _Unwind_Backtrace(unwindCallback, &state);
+
+  return state.current - buffer;
+}
+
+static void dumpBacktrace(std::ostream& os, void** buffer, size_t count) {
+  for (size_t idx = 0; idx < count; ++idx) {
+    const void* addr = buffer[idx];
+    const char* symbol = "";
+
+    Dl_info info;
+    if (dladdr(addr, &info) && info.dli_sname) {
+      symbol = info.dli_sname;
+    }
+
+    os << "  #" << std::setw(2) << idx << ": " << addr << "  " << symbol
+       << "\n";
+  }
+}
+
+} // namespace flipper
+} // namespace facebook
+
+#endif