1 files changed, 61 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/Debugger-onNativeCall-02.js b/js/src/jit-test/tests/debug/Debugger-onNativeCall-02.js
new file mode 100644
index 0000000000..9e372d179a
--- /dev/null
+++ b/js/src/jit-test/tests/debug/Debugger-onNativeCall-02.js
@@ -0,0 +1,61 @@
+// Test that the onNativeCall hook can control the call's behavior.
+
+var g = newGlobal({newCompartment: true});
+var dbg = Debugger(g);
+var gdbg = dbg.addDebuggee(g);
+
+g.eval(`
+var x = [];
+Object.defineProperty(x, "a", {
+  get: print,
+  set: print,
+});
+var rv;
+function f() {
+  x.a++;
+  try {
+    rv = x.push(4);
+  } catch (e) {
+    throw "rethrowing";
+  }
+}
+`);
+
+for (let i = 0; i < 5; i++) {
+  g.f();
+}
+
+for (let i = 0; i < 5; i++) {
+  // Test terminating execution.
+  dbg.onNativeCall = (callee, reason) => {
+    return null;
+  };
+  const len = g.x.length;
+  let v = gdbg.executeInGlobal(`f()`);
+  assertEq(v, null);
+  assertEq(g.x.length, len);
+
+  // Test throwing an exception.
+  dbg.onNativeCall = (callee, reason) => {
+    return { throw: "throwing" };
+  };
+  v = gdbg.executeInGlobal(`f()`);
+  assertEq(v.throw, "throwing");
+
+  // Test throwing an exception #2.
+  dbg.onNativeCall = (callee, reason) => {
+    if (callee.name == "push") {
+      return { throw: "throwing" };
+    }
+  };
+  v = gdbg.executeInGlobal(`f()`);
+  assertEq(v.throw, "rethrowing");
+
+  // Test returning a different value from the native.
+  dbg.onNativeCall = (callee, reason) => {
+    return { return: "value" };
+  };
+  v = gdbg.executeInGlobal(`f()`);
+  assertEq(v.return, undefined);
+  assertEq(g.rv, "value");
+}