1 files changed, 48 insertions, 0 deletions
diff --git a/js/src/wasm/WasmException.h b/js/src/wasm/WasmException.h
new file mode 100644
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+++ b/js/src/wasm/WasmException.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ *
+ * Copyright 2021 Mozilla Foundation
+ *
+ * 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_exception_h
+#define wasm_exception_h
+
+namespace js {
+namespace wasm {
+
+static const uint32_t CatchAllIndex = UINT32_MAX;
+static_assert(CatchAllIndex > MaxTags);
+
+struct TryTableCatch {
+  TryTableCatch()
+      : tagIndex(CatchAllIndex), labelRelativeDepth(0), captureExnRef(false) {}
+
+  // The tag index for this catch, or CatchAllIndex for a catch_all.
+  uint32_t tagIndex;
+  // The relative depth of where to branch to when catching an exception.
+  uint32_t labelRelativeDepth;
+  // Whether the exnref that is caught should be captured and passed to the
+  // branch target.
+  bool captureExnRef;
+  // The params that the target branch at `labelRelativeDepth` expects. This
+  // includes any exnref that should or should not be captured.
+  ValTypeVector labelType;
+};
+using TryTableCatchVector = Vector<TryTableCatch, 1, SystemAllocPolicy>;
+
+}  // namespace wasm
+}  // namespace js
+
+#endif  // wasm_exception_h