v8/test/mjsunit/stack-traces-custom.js

// Copyright 2015 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.

var o = {
  f: function() { throw new Error(); },
  get j() { o.h(); },
  set k(_) { o.j; },
};
o.g1 = function() { o.f() }
o.g2 = o.g1;
o.h = function() { o.g1() }

try {
  o.k = 42;
} catch (e) {
  Error.prepareStackTrace = function(e, frames) { return frames; };
  var frames = e.stack;
  Error.prepareStackTrace = undefined;
  assertEquals("f", frames[0].getMethodName());
  assertEquals(null, frames[1].getMethodName());
  assertEquals("h", frames[2].getMethodName());
  assertEquals("j", frames[3].getMethodName());
  assertEquals("k", frames[4].getMethodName());
  assertEquals(null, frames[5].getMethodName());
}

function testMethodName(f, frameNumber, expectedName) {
  try {
    Error.prepareStackTrace = function(e, frames) { return frames; }
    f();
    assertUnreachable();
  } catch (e) {
    const frame = e.stack[frameNumber];
    assertEquals(expectedName, frame.getMethodName());
  } finally {
    Error.prepareStackTrace = undefined;
  }
}

const thrower = { valueOf: () => { throw new Error(); }};

{
  const str = "";
  testMethodName(() => { str.indexOf(str, thrower); }, 1, "indexOf");
}

{
  const nr = 42;
  testMethodName(() => { nr.toString(thrower); }, 1, "toString");
}