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-rw-r--r--js/src/jit-test/tests/basic/testInt32ToId.js35
1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/testInt32ToId.js b/js/src/jit-test/tests/basic/testInt32ToId.js
new file mode 100644
index 0000000000..3164ac5de3
--- /dev/null
+++ b/js/src/jit-test/tests/basic/testInt32ToId.js
@@ -0,0 +1,35 @@
+function testInt32ToId()
+{
+ // Ensure that a property which is a negative integer that does not fit in a
+ // jsval is properly detected by the 'in' operator.
+ var obj = { "-1073741828": 17 };
+ var index = -1073741819;
+ var a = [];
+ for (var i = 0; i < 10; i++)
+ {
+ a.push(index in obj);
+ index--;
+ }
+
+ // Ensure that a property which is a negative integer that does not fit in a
+ // jsval is properly *not* detected by the 'in' operator. In this case
+ // wrongly applying INT_TO_JSID to -2147483648 will shift off the sign bit
+ // (the only bit set in that number) and bitwise-or that value with 1,
+ // producing jsid(1) -- which actually represents "0", not "-2147483648".
+ // Thus 'in' will report a "-2147483648" property when none exists, because
+ // it thinks the request was really whether the object had property "0".
+ var obj2 = { 0: 17 };
+ var b = [];
+ var index = -(1 << 28);
+ for (var i = 0; i < 10; i++)
+ {
+ b.push(index in obj2);
+ index = index - (1 << 28);
+ }
+
+ return a.join(",") + b.join(",");
+}
+
+assertEq(testInt32ToId(),
+ "false,false,false,false,false,false,false,false,false,true" +
+ "false,false,false,false,false,false,false,false,false,false");