summaryrefslogtreecommitdiff
path: root/src/ast/global-utils.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/ast/global-utils.h')
-rw-r--r--src/ast/global-utils.h55
1 files changed, 55 insertions, 0 deletions
diff --git a/src/ast/global-utils.h b/src/ast/global-utils.h
new file mode 100644
index 000000000..f5bebe8aa
--- /dev/null
+++ b/src/ast/global-utils.h
@@ -0,0 +1,55 @@
+/*
+ * 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_ast_global_h
+#define wasm_ast_global_h
+
+#include <algorithm>
+#include <vector>
+
+#include "literal.h"
+#include "wasm.h"
+
+namespace wasm {
+
+namespace GlobalUtils {
+ // find a global initialized to the value of an import, or null if no such global
+ inline Global* getGlobalInitializedToImport(Module&wasm, Name module, Name base) {
+ // find the import
+ Name imported;
+ for (auto& import : wasm.imports) {
+ if (import->module == module && import->base == base) {
+ imported = import->name;
+ break;
+ }
+ }
+ if (imported.isNull()) return nullptr;
+ // find a global inited to it
+ for (auto& global : wasm.globals) {
+ if (auto* init = global->init->dynCast<GetGlobal>()) {
+ if (init->name == imported) {
+ return global.get();
+ }
+ }
+ }
+ return nullptr;
+ }
+};
+
+} // namespace wasm
+
+#endif // wasm_ast_global_h
+