Add string parameter to WASM_UNREACHABLE (#2499)

This works more like llvm's unreachable handler in that is preserves
information even in release builds.

1 files changed, 45 insertions, 0 deletions

diff --git a/src/support/utilities.cpp b/src/support/utilities.cpp
new file mode 100644
index 000000000..ea426df9c
--- /dev/null
+++ b/src/support/utilities.cpp
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2019 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "utilities.h"
+
+#include <cassert>
+#include <cstdlib>
+#include <iostream>
+
+#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
+#include "sanitizer/common_interface_defs.h"
+#endif
+
+void wasm::handle_unreachable(const char* msg,
+                              const char* file,
+                              unsigned line) {
+#ifndef NDEBUG
+  if (msg) {
+    std::cerr << msg << "\n";
+  }
+  std::cerr << "UNREACHABLE executed";
+  if (file) {
+    std::cerr << " at " << file << ":" << line;
+  }
+  std::cerr << "!\n";
+#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
+  __sanitizer_print_stack_trace();
+  __builtin_trap();
+#endif
+#endif
+  abort();
+}