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deps/v8/test/mjsunit/turboshaft/string-escape-analysis-exponential-state.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 --turboshaft-string-concat-escape-analysis
+// Flags: --turbofan --no-always-turbofan
+
+
+function foo(str, c) {
+  // Without de-duplication of the string concatenations in the FrameState, the
+  // size of the FrameState will grow exponentially.
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  str += str;
+  if (c) {
+    // We're not collecting feedback for this, which means that it will be an
+    // unconditional Deopt with `str` as input in the FrameState.
+    return str + str;
+  }
+}
+
+
+%PrepareFunctionForOptimization(foo);
+foo("a", false);
+foo("a", false);
+
+%OptimizeFunctionOnNextCall(foo);
+foo("a", false);
+assertOptimized(foo);
+
+// We pass `true` to the function, which triggers a deopt and causes it to
+// return the string.
+assertEquals("a".repeat(2 ** 21), foo("a", true));
+assertUnoptimized(foo);