bug-1444604-reduced.js

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// LiveSavedFrameCache should not be confused by eval-in-frame-prev links.

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

const dbg = new Debugger();

const gDO = dbg.addDebuggee(g);

g.evaluate(`

  function inner() { debugger; }

  function outer() { inner(); }

`);

dbg.onDebuggerStatement = function handler(frame) {

  // Capture the JS stack, putting frames for handler, inner, and outer in the

  // cache. Perform all captures in g's compartment, to avoid flushing the cache

  // for compartment mismatches.

  frame.eval('print(`in inner: ${saveStack()}`)');

  // Carry out a capture in outer's context, following the eval-in-frame prev

  // link and thus skipping over inner, removing it from the cache.

  frame.older.eval('print(`in outer: ${saveStack()}`)');

  // Capture again. inner's hasCachedSavedFrame bit should be set, but its entry

  // has been flushed.

  frame.eval('print(`in inner: ${saveStack()}`)');

};

g.outer();