Upload Kmake

deps/v8/test/mjsunit/turboshaft/maglev-frontend/dematerialized-regexp.js

@@ -0,0 +1,39 @@
+// Copyright 2024 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax --turbolev --turbofan
+// Flags: --no-always-turbofan
+
+function bar(re) {
+  let match1 = re.test("123Art");
+  let match2 = re.test("b123ze");
+  let match3 = re.test("C");
+  let nomatch1 = re.test("1234556");
+  let nomatch2 = re.test("iopdsd4 ,!:^");
+  return match1 && match2 && match3 && !nomatch1 && !nomatch2;
+}
+%NeverOptimizeFunction(bar);
+
+function foo(b) {
+  let re = /[abc]/i;
+  if (b) {
+    // We're not collecting feedback for this case. We'll just have an
+    // unconditional deopt here, and {re} will be escape-analyzed away and will
+    // flow in the FrameState here. Since RegExp data are in trusted space,
+    // the FrameState will thus have a trusted object as input.
+    return bar(re);
+  }
+  return 42;
+}
+
+%PrepareFunctionForOptimization(foo);
+assertEquals(42, foo(false));
+assertEquals(42, foo(false));
+%OptimizeFunctionOnNextCall(foo);
+assertEquals(42, foo(false));
+assertOptimized(foo);
+
+// Triggering a deopt, which will materialize the regex object.
+assertEquals(true, foo(true));
+assertUnoptimized(foo);