Commit 7bbfc8fc authored by ricow@chromium.org's avatar ricow@chromium.org

Refactor the samevalue internal method and add tests for this method.

Noticing that the only difference between samevalue and strict equality is on
numbers we can simplify SameValue.

The old version did not return a correct answer if called on two strings since 
StringEquals (from runtime.cc) returns an answer that is the negated value 
(if treated as a boolean).


Review URL: http://codereview.chromium.org/2136024

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4713 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
parent 10f1cab4
......@@ -559,19 +559,15 @@ function ToInt32(x) {
// ES5, section 9.12
function SameValue(x, y) {
if (typeof x != typeof y) return false;
if (IS_NULL_OR_UNDEFINED(x)) return true;
if (IS_NUMBER(x)) {
if (NUMBER_IS_NAN(x) && NUMBER_IS_NAN(y)) return true;
// x is +0 and y is -0 or vice versa.
if (x === 0 && y === 0 && (1 / x) != (1 / y)) {
return false;
}
return x == y;
return x === y;
}
if (IS_STRING(x)) return %StringEquals(x, y);
if (IS_BOOLEAN(x)) return y == x;
return %_ObjectEquals(x, y);
return x === y
}
......
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// * Redistributions of source code must retain the above copyright
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --expose-natives_as natives
// Test the SameValue internal method.
var obj1 = {x: 10, y: 11, z: "test"};
var obj2 = {x: 10, y: 11, z: "test"};
assertTrue(natives.SameValue(0, 0));
assertTrue(natives.SameValue(+0, +0));
assertTrue(natives.SameValue(-0, -0));
assertTrue(natives.SameValue(1, 1));
assertTrue(natives.SameValue(2, 2));
assertTrue(natives.SameValue(-1, -1));
assertTrue(natives.SameValue(0.5, 0.5));
assertTrue(natives.SameValue(true, true));
assertTrue(natives.SameValue(false, false));
assertTrue(natives.SameValue(NaN, NaN));
assertTrue(natives.SameValue(null, null));
assertTrue(natives.SameValue("foo", "foo"));
assertTrue(natives.SameValue(obj1, obj1));
// Undefined values.
assertTrue(natives.SameValue());
assertTrue(natives.SameValue(undefined, undefined));
assertFalse(natives.SameValue(0,1));
assertFalse(natives.SameValue("foo", "bar"));
assertFalse(natives.SameValue(obj1, obj2));
assertFalse(natives.SameValue(true, false));
assertFalse(natives.SameValue(obj1, true));
assertFalse(natives.SameValue(obj1, "foo"));
assertFalse(natives.SameValue(obj1, 1));
assertFalse(natives.SameValue(obj1, undefined));
assertFalse(natives.SameValue(obj1, NaN));
assertFalse(natives.SameValue(undefined, true));
assertFalse(natives.SameValue(undefined, "foo"));
assertFalse(natives.SameValue(undefined, 1));
assertFalse(natives.SameValue(undefined, obj1));
assertFalse(natives.SameValue(undefined, NaN));
assertFalse(natives.SameValue(NaN, true));
assertFalse(natives.SameValue(NaN, "foo"));
assertFalse(natives.SameValue(NaN, 1));
assertFalse(natives.SameValue(NaN, obj1));
assertFalse(natives.SameValue(NaN, undefined));
assertFalse(natives.SameValue("foo", true));
assertFalse(natives.SameValue("foo", 1));
assertFalse(natives.SameValue("foo", obj1));
assertFalse(natives.SameValue("foo", undefined));
assertFalse(natives.SameValue("foo", NaN));
assertFalse(natives.SameValue(true, 1));
assertFalse(natives.SameValue(true, obj1));
assertFalse(natives.SameValue(true, undefined));
assertFalse(natives.SameValue(true, NaN));
assertFalse(natives.SameValue(true, "foo"));
assertFalse(natives.SameValue(1, true));
assertFalse(natives.SameValue(1, obj1));
assertFalse(natives.SameValue(1, undefined));
assertFalse(natives.SameValue(1, NaN));
assertFalse(natives.SameValue(1, "foo"));
// Special string cases.
assertFalse(natives.SameValue("1", 1));
assertFalse(natives.SameValue("true", true));
assertFalse(natives.SameValue("false", false));
assertFalse(natives.SameValue("undefined", undefined));
assertFalse(natives.SameValue("NaN", NaN));
// -0 and +0 are should be different
assertFalse(natives.SameValue(+0, -0));
assertFalse(natives.SameValue(-0, +0));
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