1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/jit/BaselineCompiler.cpp b/js/src/jit/BaselineCompiler.cpp
index 4f4ca8b89..d254b9826 100644
--- a/js/src/jit/BaselineCompiler.cpp
+++ b/js/src/jit/BaselineCompiler.cpp
@@ -3931,6 +3931,28 @@ BaselineCompiler::emit_JSOP_TOASYNCGEN()
     return true;
 }
 
+typedef JSObject* (*ToAsyncIterFn)(JSContext*, HandleObject);
+static const VMFunction ToAsyncIterInfo =
+    FunctionInfo<ToAsyncIterFn>(js::CreateAsyncFromSyncIterator, "ToAsyncIter");
+
+bool
+BaselineCompiler::emit_JSOP_TOASYNCITER()
+{
+    frame.syncStack(0);
+    masm.unboxObject(frame.addressOfStackValue(frame.peek(-1)), R0.scratchReg());
+
+    prepareVMCall();
+    pushArg(R0.scratchReg());
+
+    if (!callVM(ToAsyncIterInfo))
+        return false;
+
+    masm.tagValue(JSVAL_TYPE_OBJECT, ReturnReg, R0);
+    frame.pop();
+    frame.push(R0);
+    return true;
+}
+
 typedef bool (*ThrowObjectCoercibleFn)(JSContext*, HandleValue);
 static const VMFunction ThrowObjectCoercibleInfo =
     FunctionInfo<ThrowObjectCoercibleFn>(ThrowObjectCoercible, "ThrowObjectCoercible");