v8/test/mjsunit/compiler/regress-funcaller.js

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// Flags: --allow-natives-syntax

// Test function.caller.
function A() {}

function fun(x) {
  if (x == 0) return fun.caller;
  if (x == 1) return gee.caller;
  return 42;
}
function gee(x) { return this.f(x); }

A.prototype.f = fun;
A.prototype.g = gee;

var o = new A();

%PrepareFunctionForOptimization(o.g);
for (var i=0; i<5; i++) {
  o.g(i);
}
%OptimizeFunctionOnNextCall(o.g);
assertEquals(gee, o.g(0));
assertEquals(null, o.g(1));

// Test when called from another function.
function hej(x) {
  if (x == 0) return o.g(x);
  if (x == 1) return o.g(x);
  return o.g(x);
}

%PrepareFunctionForOptimization(hej);
for (var j=0; j<5; j++) {
  hej(j);
}
%OptimizeFunctionOnNextCall(hej);
assertEquals(gee, hej(0));
assertEquals(hej, hej(1));

// Test when called from eval.
function from_eval(x) {
  if (x == 0) return eval("o.g(x);");
  if (x == 1) return eval("o.g(x);");
  return o.g(x);
}

%PrepareFunctionForOptimization(from_eval);
for (var j=0; j<5; j++) {
  from_eval(j);
}
%OptimizeFunctionOnNextCall(from_eval);
assertEquals(gee, from_eval(0));
assertEquals(from_eval, from_eval(1));