v8/test/mjsunit/compiler/inline-global-access.js

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// Flags: --allow-natives-syntax

// Test that we can inline a function that returns the result of a
// global variable load.
var GLOBAL;
function TestInlineGlobalLoad(o) {
  // Effect context.
  GLOBAL = 42;
  o.f();
  // Value context.
  var x = o.f();
  assertEquals(42, x);
  GLOBAL = 87;
  assertEquals(87, o.f());
  // Test context.
  if (!o.f()) {
    assertTrue(false);  // Should not happen.
  }
}

%PrepareFunctionForOptimization(TestInlineGlobalLoad);
var o = {};
o.f = function() { return GLOBAL; };
for (var i = 0; i < 5; i++) TestInlineGlobalLoad(o);
%OptimizeFunctionOnNextCall(TestInlineGlobalLoad);
TestInlineGlobalLoad(o);
TestInlineGlobalLoad({f: o.f});