v8/test/mjsunit/compiler/globals.js

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// Test references and assignments to global variables.
var g = 0;

// Test compilation of a global variable store.
assertEquals(1, eval('g = 1'));
// Test that the store worked.
assertEquals(1, g);

// Test that patching the IC in the compiled code works.
assertEquals(1, eval('g = 1'));
assertEquals(1, g);
assertEquals(1, eval('g = 1'));
assertEquals(1, g);

// Test a second store.
assertEquals("2", eval('g = "2"'));
assertEquals("2", g);

// Test a load.
assertEquals("2", eval('g'));

// Test that patching the IC in the compiled code works.
assertEquals("2", eval('g'));
assertEquals("2", eval('g'));

// Test a second load.
g = 3;
assertEquals(3, eval('g'));

// Test postfix count operation
var t;
t = g++;
assertEquals(3, t);
assertEquals(4, g);

code = "g--; 1";
assertEquals(1, eval(code));
assertEquals(3, g);

// Test simple assignment to non-deletable and deletable globals.
var glo1 = 0;
function f1(x) { glo1 = x; }
f1(42);
assertEquals(glo1, 42);

glo2 = 0;
function f2(x) { glo2 = x; }
f2(42);
assertEquals(42, glo2);