Copy debug info when inlining (#2168)

1 files changed, 59 insertions, 0 deletions

diff --git a/src/ir/debug.h b/src/ir/debug.h
new file mode 100644
index 000000000..d4ecf2b70
--- /dev/null
+++ b/src/ir/debug.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright 2019 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_debug_h
+#define wasm_ir_debug_h
+
+#include <wasm-traversal.h>
+
+namespace wasm {
+
+namespace debug {
+
+// Given an expression and a copy of it in another function, copy the debug
+// info into the second function.
+inline void copyDebugInfo(Expression* origin,
+                          Expression* copy,
+                          Function* originFunc,
+                          Function* copyFunc) {
+  struct Lister : public PostWalker<Lister, UnifiedExpressionVisitor<Lister>> {
+    std::vector<Expression*> list;
+    void visitExpression(Expression* curr) { list.push_back(curr); }
+  };
+
+  Lister originList;
+  originList.walk(origin);
+  Lister copyList;
+  copyList.walk(copy);
+
+  auto& originDebug = originFunc->debugLocations;
+  auto& copyDebug = copyFunc->debugLocations;
+
+  assert(originList.list.size() == copyList.list.size());
+  for (Index i = 0; i < originList.list.size(); i++) {
+    auto iter = originDebug.find(originList.list[i]);
+    if (iter != originDebug.end()) {
+      auto location = iter->second;
+      copyDebug[copyList.list[i]] = location;
+    }
+  }
+};
+
+} // namespace debug
+
+} // namespace wasm
+
+#endif // wasm_ir_debug_h