[Wasm GC] Do not refine types of exported globals in closed world (#5380)

Doing so can cause us to switch from a private type to a public type and error.

Also refactor export-utils to make this easy.

1 files changed, 49 insertions, 0 deletions

diff --git a/src/ir/export-utils.cpp b/src/ir/export-utils.cpp
new file mode 100644
index 000000000..0b19b7204
--- /dev/null
+++ b/src/ir/export-utils.cpp
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2023 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 "ir/export-utils.h"
+#include "wasm.h"
+
+namespace wasm::ExportUtils {
+
+namespace {
+
+// Returns a vector of all the things that are exported of a particular kind,
+// given that kind and a way to look them up on the module.
+template<typename T, ExternalKind K, typename G>
+std::vector<T*> getExportedByKind(Module& wasm, G getModuleItem) {
+  std::vector<T*> ret;
+  for (auto& ex : wasm.exports) {
+    if (ex->kind == K) {
+      ret.push_back(getModuleItem(ex->value));
+    }
+  }
+  return ret;
+}
+
+} // anonymous namespace
+
+std::vector<Function*> getExportedFunctions(Module& wasm) {
+  return getExportedByKind<Function, ExternalKind::Function>(
+    wasm, [&](Name name) { return wasm.getFunction(name); });
+}
+
+std::vector<Global*> getExportedGlobals(Module& wasm) {
+  return getExportedByKind<Global, ExternalKind::Global>(
+    wasm, [&](Name name) { return wasm.getGlobal(name); });
+}
+
+} // namespace wasm::ExportUtils