Check that function being patched has no activations on any thread stack

test/mjsunit/debug-liveedit-check-stack.js

+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
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+//     * Redistributions in binary form must reproduce the above
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+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --expose-debug-as debug
+// Get the Debug object exposed from the debug context global object.
+
+Debug = debug.Debug
+
+eval(
+    "function ChooseAnimal(callback) {\n " +
+    "  callback();\n" +
+    "  return 'Cat';\n" +
+    "}\n"
+);
+
+function Noop() {}
+var res = ChooseAnimal(Noop);
+
+assertEquals("Cat", res);
+
+var script = Debug.findScript(ChooseAnimal);
+
+var orig_animal = "'Cat'";
+var patch_pos = script.source.indexOf(orig_animal);
+var new_animal_patch = "'Capybara'";
+
+var got_exception = false;
+var successfully_changed = false;
+
+function Changer() {
+  // Never try the same patch again.
+  assertEquals(false, successfully_changed);
+  var change_log = new Array();
+  try {
+    Debug.LiveEditChangeScript(script, patch_pos, orig_animal.length, new_animal_patch, change_log);
+    successfully_changed = true;
+  } catch (e) {
+    if (e instanceof Debug.LiveEditChangeScript.Failure) {
+      got_exception = true;
+      print(e);
+    } else {
+      throw e;
+    }
+  }
+  print("Change log: " + JSON.stringify(change_log) + "\n");
+}
+
+var new_res = ChooseAnimal(Changer);
+// Function must be not pached.
+assertEquals("Cat", new_res);
+
+assertEquals(true, got_exception);
+
+// This time it should succeed.
+Changer();
+
+new_res = ChooseAnimal(Noop);
+// Function must be not pached.
+assertEquals("Capybara", new_res);
+