third_party/v8/test/mjsunit/compiler/variables.js

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// Simple tests of the various kinds of variable references in the
// implementstion.

// Global variables.
var x = 0;
function f0() { return x; }
assertEquals(0, f0());


// Parameters.
function f1(x) { return x; }
assertEquals(1, f1(1));


// Stack-allocated locals.
function f2() { var x = 2; return x; }
assertEquals(2, f2());


// Context-allocated locals.  Local function forces x into f3's context.
function f3(x) {
  function g() { return x; }
  return x;
}
assertEquals(3, f3(3));

// Local function reads x from an outer context.
function f4(x) {
  function g() { return x; }
  return g();
}
assertEquals(4, f4(4));


// Lookup slots.  'With' forces x to be looked up at runtime.
function f5(x) {
  with ({}) return x;
}
assertEquals(5, f5(5));


// Parameters rewritten to property accesses.  Using the name 'arguments'
// (even if it shadows the arguments object) forces all parameters to be
// rewritten to explicit property accesses.
function f6(arguments) { return arguments; }
assertEquals(6, f6(6));