Commit 95939ada authored by ricow@chromium.org's avatar ricow@chromium.org

Fix issue 720 making Object.defineProperty handle existing writable flags correctly.

The existing version will overwrite the existing writable flag with
false even in the case where no new value is given and the existing
writable flag is true.

The reason for the issue is that there is no check to see if the
provided descriptor actually has a writable attribute. This causes us
to use the default value (false) even in the case where nothing was
provided. In addition, the existing tests makes wrong assumptions (that writable is always set to false if not provided) and has been changed to follow the specification.

Review URL: http://codereview.chromium.org/2271001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4720 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
parent 909a447b
......@@ -604,7 +604,13 @@ function DefineOwnProperty(obj, p, desc, should_throw) {
flag |= DONT_DELETE;
if (IsDataDescriptor(desc) || IsGenericDescriptor(desc)) {
flag |= desc.isWritable() ? 0 : READ_ONLY;
if (desc.hasWritable()) {
flag |= desc.isWritable() ? 0 : READ_ONLY;
} else if (!IS_UNDEFINED(current)) {
flag |= current.isWritable() ? 0 : READ_ONLY;
} else {
flag |= READ_ONLY;
}
%DefineOrRedefineDataProperty(obj, p, desc.getValue(), flag);
} else {
if (desc.hasGetter() && IS_FUNCTION(desc.getGet())) {
......
......@@ -289,7 +289,7 @@ desc = Object.getOwnPropertyDescriptor(obj1, "foobar");
assertEquals(obj1.foobar, 2000);
assertEquals(desc.value, 2000);
assertFalse(desc.configurable);
assertFalse(desc.writable);
assertTrue(desc.writable);
assertFalse(desc.enumerable);
assertEquals(desc.get, undefined);
assertEquals(desc.set, undefined);
......@@ -317,7 +317,7 @@ desc = Object.getOwnPropertyDescriptor(obj1, "foobar");
assertEquals(obj1.foobar, 2000);
assertEquals(desc.value, 2000);
assertFalse(desc.configurable);
assertFalse(desc.writable);
assertTrue(desc.writable);
assertFalse(desc.enumerable);
assertEquals(desc.get, undefined);
assertEquals(desc.set, undefined);
......
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//
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// This regression test is used to ensure that Object.defineProperty
// keeps the existing value of the writable flag if none is given
// in the provided descriptor.
// See: http://code.google.com/p/v8/issues/detail?id=720
var o = {x: 10};
Object.defineProperty(o, "x", {value: 5});
var desc = Object.getOwnPropertyDescriptor(o, "x");
assertTrue(desc["writable"]);
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