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deps/v8/test/mjsunit/turboshaft/maglev-frontend/throw.js

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+// 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 throw_if_true(b) {
+  if (b) { throw "a" }
+  return 17;
+}
+
+function f(b) {
+  try {
+    return throw_if_true(b);
+  } catch (e) {
+    return 42;
+  }
+}
+
+%PrepareFunctionForOptimization(f);
+assertEquals(17, f(false));
+assertEquals(17, f(false));
+%OptimizeFunctionOnNextCall(f);
+assertEquals(17, f(false));
+assertOptimized(f);
+
+// Triggering an exception for the 1st time will cause a lazy deopt.
+assertEquals(42, f(true));
+assertUnoptimized(f);
+
+// When reoptimizing, subsequent exceptions should not deopt the function.
+%OptimizeFunctionOnNextCall(f);
+assertEquals(17, f(false));
+assertEquals(42, f(true));
+assertOptimized(f);