1 files changed, 65 insertions, 0 deletions
diff --git a/third_party/wabt/wasm2c/wasm-rt-impl.h b/third_party/wabt/wasm2c/wasm-rt-impl.h
new file mode 100644
index 000000000..39d5ed930
--- /dev/null
+++ b/third_party/wabt/wasm2c/wasm-rt-impl.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2018 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.
+ */
+
+#ifndef WASM_RT_IMPL_H_
+#define WASM_RT_IMPL_H_
+
+#include <setjmp.h>
+
+#include "wasm-rt.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** A setjmp buffer used for handling traps. */
+extern jmp_buf g_jmp_buf;
+
+/** Saved call stack depth that will be restored in case a trap occurs. */
+extern uint32_t g_saved_call_stack_depth;
+
+#if WASM_RT_MEMCHECK_SIGNAL_HANDLER_POSIX
+#define WASM_RT_SETJMP(buf) sigsetjmp(buf, 1)
+#define WASM_RT_LONGJMP(buf, val) siglongjmp(buf, val)
+#else
+#define WASM_RT_SETJMP(buf) setjmp(buf)
+#define WASM_RT_LONGJMP(buf, val) longjmp(buf, val)
+#endif
+
+/** Convenience macro to use before calling a wasm function. On first execution
+ * it will return `WASM_RT_TRAP_NONE` (i.e. 0). If the function traps, it will
+ * jump back and return the trap that occurred.
+ *
+ * ```
+ *   wasm_rt_trap_t code = wasm_rt_impl_try();
+ *   if (code != 0) {
+ *     printf("A trap occurred with code: %d\n", code);
+ *     ...
+ *   }
+ *
+ *   // Call the potentially-trapping function.
+ *   my_wasm_func();
+ * ```
+ */
+#define wasm_rt_impl_try()                              \
+  (g_saved_call_stack_depth = wasm_rt_call_stack_depth, \
+   WASM_RT_SETJMP(g_jmp_buf))
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // WASM_RT_IMPL_H_