1 files changed, 48 insertions, 0 deletions
diff --git a/src/ir/find_all.h b/src/ir/find_all.h
new file mode 100644
index 000000000..83c751666
--- /dev/null
+++ b/src/ir/find_all.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2017 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_ir_find_all_h
+#define wasm_ir_find_all_h
+
+#include <wasm-traversal.h>
+
+namespace wasm {
+
+// Find all instances of a certain node type
+
+template<typename T>
+struct FindAll {
+  std::vector<T*> list;
+
+  FindAll(Expression* ast) {
+    struct Finder : public PostWalker<Finder, UnifiedExpressionVisitor<Finder>> {
+      std::vector<T*>* list;
+      void visitExpression(Expression* curr) {
+        if (curr->is<T>()) {
+          (*list).push_back(curr->cast<T>());
+        }
+      }
+    };
+    Finder finder;
+    finder.list = &list;
+    finder.walk(ast);
+  }
+};
+
+} // namespace wasm
+
+#endif // wasm_ir_find_all_h
+