1 files changed, 15 insertions, 1 deletions
diff --git a/src/wasm/wasm-stack.cpp b/src/wasm/wasm-stack.cpp
index 00b1e5368..cb9d94093 100644
--- a/src/wasm/wasm-stack.cpp
+++ b/src/wasm/wasm-stack.cpp
@@ -1904,7 +1904,7 @@ void BinaryInstWriter::visitRefEq(RefEq* curr) {
 }
 
 void BinaryInstWriter::visitTry(Try* curr) {
-  breakStack.emplace_back(IMPOSSIBLE_CONTINUE);
+  breakStack.push_back(curr->name);
   o << int8_t(BinaryConsts::Try);
   emitResultType(curr->type);
 }
@@ -1924,6 +1924,13 @@ void BinaryInstWriter::emitCatchAll(Try* curr) {
   o << int8_t(BinaryConsts::CatchAll);
 }
 
+void BinaryInstWriter::emitDelegate(Try* curr) {
+  assert(!breakStack.empty());
+  breakStack.pop_back();
+  o << int8_t(BinaryConsts::Delegate)
+    << U32LEB(getBreakIndex(curr->delegateTarget));
+}
+
 void BinaryInstWriter::visitThrow(Throw* curr) {
   o << int8_t(BinaryConsts::Throw) << U32LEB(parent.getEventIndex(curr->event));
 }
@@ -2216,6 +2223,9 @@ void BinaryInstWriter::emitMemoryAccess(size_t alignment,
 }
 
 int32_t BinaryInstWriter::getBreakIndex(Name name) { // -1 if not found
+  if (name == DELEGATE_CALLER_TARGET) {
+    return breakStack.size();
+  }
   for (int i = breakStack.size() - 1; i >= 0; i--) {
     if (breakStack[i] == name) {
       return breakStack.size() - 1 - i;
@@ -2321,6 +2331,10 @@ void StackIRToBinaryWriter::write() {
         writer.emitCatchAll(inst->origin->cast<Try>());
         break;
       }
+      case StackInst::Delegate: {
+        writer.emitDelegate(inst->origin->cast<Try>());
+        break;
+      }
       default:
         WASM_UNREACHABLE("unexpected op");
     }