v8/test/mjsunit/compiler/short-circuit.js

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// Test some expression contexts involving short-circuit boolean
// operations that did not otherwise have test coverage.


var x = 42;

// Literals in value/test context.
assertEquals(x, function () { return 0 || x }());
assertEquals(1, function () { return 1 || x }());

// Literals in test/value context.
assertEquals(0, function () { return 0 && x }());
assertEquals(x, function () { return 1 && x }());

// A value on top of the stack in value/test context.
assertEquals(x, function(y) { return y++ || x }(0));
assertEquals(1, function(y) { return y++ || x }(1));

// A value on top of the stack in a test/value context.
assertEquals(0, function(y) { return y++ && x }(0));
assertEquals(x, function(y) { return y++ && x }(1));

// An object literal in value context.
assertEquals(0, function () { return {x: 0}}().x);

// An object literal in value/test context.
assertEquals(0, function () { return {x: 0} || this }().x);

// An object literal in test/value context.
assertEquals(x, function () { return {x: 0} && this }().x);

// An array literal in value/test context.
assertEquals(0, function () { return [0,1] || new Array(x,1) }()[0]);

// An array literal in test/value context.
assertEquals(x, function () { return [0,1] && new Array(x,1) }()[0]);

// Slot assignment in value/test context.
assertEquals(x, function (y) { return (y = 0) || x }("?"));
assertEquals(1, function (y) { return (y = 1) || x }("?"));

// Slot assignment in test/value context.
assertEquals(0, function (y) { return (y = 0) && x }("?"));
assertEquals(x, function (y) { return (y = 1) && x }("?"));

// void in value context.
assertEquals(void 0, function () { return void x }());

// void in value/test context.
assertEquals(x, function () { return (void x) || x }());

// void in test/value context.
assertEquals(void 0, function () { return (void x) && x }());

// Unary not in value context.
assertEquals(false, function () { return !x }());

// Unary not in value/test context.
assertEquals(true, function (y) { return !y || x }(0));
assertEquals(x, function (y) { return !y || x }(1));

// Unary not in test/value context.
assertEquals(x, function (y) { return !y && x }(0));
assertEquals(false, function (y) { return !y && x }(1));

// Comparison in value context.
assertEquals(false, function () { return x < x; }());

// Comparison in value/test context.
assertEquals(x, function () { return x < x || x; }());
assertEquals(true, function () { return x <= x || x; }());

// Comparison in test/value context.
assertEquals(false, function () { return x < x && x; }());
assertEquals(x, function () { return x <= x && x; }());