[debugger] whitelist some builtins as side-effect free.

test/debugger/debug/debug-evaluate-no-side-effect-builtins.js

+// Copyright 2017 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: --ignition --side-effect-free-debug-evaluate
+
+Debug = debug.Debug
+
+var exception = null;
+
+function listener(event, exec_state, event_data, data) {
+  if (event != Debug.DebugEvent.Break) return;
+  try {
+    function success(expectation, source) {
+      assertEquals(expectation, exec_state.frame(0).evaluate(source).value());
+    }
+    function fail(source) {
+      assertThrows(() => exec_state.frame(0).evaluate(source), EvalError);
+    }
+
+    // Test Math functions.
+    for (f of Object.getOwnPropertyNames(Math)) {
+      if (typeof Math[f] === "function") {
+        var result = exec_state.frame(0).evaluate(
+                         `Math.${f}(0.5, -0.5);`).value();
+        if (f != "random") assertEquals(Math[f](0.5, -0.5), result);
+      }
+    }
+
+    // Test Number functions.
+    for (f of Object.getOwnPropertyNames(Number)) {
+      if (typeof Number[f] === "function") {
+        success(Number[f](0.5), `Number.${f}(0.5);`);
+      }
+    }
+    for (f of Object.getOwnPropertyNames(Number.prototype)) {
+      if (typeof Number.prototype[f] === "function") {
+        if (f == "toLocaleString") continue;
+        success(Number(0.5)[f](5), `Number(0.5).${f}(5);`);
+      }
+    }
+
+    // Test String functions.
+    success(" ", "String.fromCodePoint(0x20)");
+    success(" ", "String.fromCharCode(0x20)");
+    for (f of Object.getOwnPropertyNames(String.prototype)) {
+      if (typeof String.prototype[f] === "function") {
+        // Do not expect locale-specific or regexp-related functions to work.
+        if (f.indexOf("locale") >= 0) continue;
+        if (f == "normalize") continue;
+        if (f == "match") continue;
+        if (f == "search") continue;
+        if (f == "split") continue;
+        success("abcd"[f](2), `"abcd".${f}(2);`);
+      }
+    }
+    fail("'abcd'.match(/a/)");
+    fail("'abcd'.replace(/a/)");
+    fail("'abcd'.search(/a/)");
+    fail("'abcd'.split(/a/)");
+
+    // Test JSON functions.
+    success('{"abc":[1,2]}', "JSON.stringify(JSON.parse('{\"abc\":[1,2]}'))");
+  } catch (e) {
+    exception = e;
+    print(e, e.stack);
+  };
+};
+
+// Add the debug event listener.
+Debug.setListener(listener);
+
+function f() {
+  debugger;
+};
+
+f();
+
+assertNull(exception);