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authorTom Ritter <tom@mozilla.com>2018-02-20 12:18:30 -0600
committerwolfbeast <mcwerewolf@gmail.com>2018-03-14 11:27:26 +0100
commita32b7f7c4e4e31669e0787e6321d74e4db71e514 (patch)
treee83acb2eb895162f010e7ff9ee2d39548c4d90b4 /js/src/jsdate.cpp
parentbd819cc43653220abdbfe040ba5c721e9861241c (diff)
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Bug 1430173 - Reduce the precision of all explicit clocks to 2ms. r=baku, a=RyanVM
Backport to ESR where we don't have the ResistFingerprinting component. MozReview-Commit-ID: 9bjycHjR3SF --HG-- extra : transplant_source : %EA%03%21%0A%E9%3F%8E%CD%7C%D79f%96%85%96%00%5D%7F%95X
Diffstat (limited to 'js/src/jsdate.cpp')
-rwxr-xr-x[-rw-r--r--]js/src/jsdate.cpp5
1 files changed, 4 insertions, 1 deletions
diff --git a/js/src/jsdate.cpp b/js/src/jsdate.cpp
index d73fb93d2..ccaeda2a3 100644..100755
--- a/js/src/jsdate.cpp
+++ b/js/src/jsdate.cpp
@@ -1232,7 +1232,10 @@ date_parse(JSContext* cx, unsigned argc, Value* vp)
static ClippedTime
NowAsMillis()
{
- return TimeClip(static_cast<double>(PRMJ_Now()) / PRMJ_USEC_PER_MSEC);
+ const double maxResolutionMs = 2;
+ double timestamp = static_cast<double>(PRMJ_Now()) / PRMJ_USEC_PER_MSEC;
+ timestamp = floor(timestamp / maxResolutionMs) * maxResolutionMs;
+ return TimeClip(timestamp);
}
bool