Frame-onStep-assign-function.js

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// Changing onStep while the function is dead is allowed.

load(libdir + "asserts.js");

const g = newGlobal({ newCompartment: true });

const dbg = new Debugger(g);

let steps = new Set();

dbg.onDebuggerStatement = function(frame) {

  // Setting 'onStep' while alive is allowed.

  steps.add("debugger 1");

  assertEq(frame.onStack, true);

  frame.onStep = function() {

    steps.add("onstep 1");

};

  dbg.onDebuggerStatement = function() {

    // Clear the 'onStep' while dead.

    steps.add("debugger 2");

    assertEq(frame.onStack, false);

    // Clearing 'onStep' while dead is allowed.

    frame.onStep = undefined;

      // Setting 'onStep' while dead is allowed.

    frame.onStep = function() {

      steps.add("onstep 2");

};

};

};

g.eval(

    function myGen() {

      debugger;

      print("make sure we have a place to step to inside the frame");

    const g = myGen();

    debugger;

);

assertDeepEq(Array.from(steps), [

  "debugger 1",

  "onstep 1",

  "debugger 2",

]);