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-rw-r--r--js/src/tests/non262/String/ropes.js58
1 files changed, 58 insertions, 0 deletions
diff --git a/js/src/tests/non262/String/ropes.js b/js/src/tests/non262/String/ropes.js
new file mode 100644
index 0000000000..b8e99dacb9
--- /dev/null
+++ b/js/src/tests/non262/String/ropes.js
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+print("Stress test of ropes");
+
+if (typeof newRope === "undefined") {
+ var newRope = SpecialPowers.Cu.getJSTestingFunctions().newRope;
+}
+if (typeof ensureLinearString === "undefined") {
+ var ensureLinearString = SpecialPowers.Cu.getJSTestingFunctions().ensureLinearString;
+}
+
+function createRopes() {
+ const ropes = {};
+
+ let j = 88;
+ function advance() {
+ // This is totally made up and probably stupid.
+ j = ((((j * 7) >> 2) + j) + (j << 3)) | 0;
+ return j;
+ }
+
+ function randomBalancedRope(height) {
+ if (height == 0)
+ return "s" + j;
+
+ const left = randomBalancedRope(height - 1);
+ advance();
+ const right = randomBalancedRope(height - 1);
+ advance();
+ return newRope(left, right, {nursery:(j & 1)});
+ }
+
+ // Construct a fairly big random rope first. If we did it later, then the
+ // chances of it all ending up tenured are higher.
+ ropes.balanced = randomBalancedRope(10);
+
+ ropes.simple = newRope("a", "b");
+ ropes.simple_tenured = newRope("a", "b", {nursery:false});
+ ropes.tenured_nursery = newRope("a", newRope("b", "c", {nursery:true}), {nursery:false});
+ ropes.nursery_tenured = newRope("a", newRope("b", "c", {nursery:false}), {nursery:true});
+
+ return ropes;
+}
+
+const ropes = createRopes();
+
+// Flatten them all.
+for (const [name, rope] of Object.entries(ropes))
+ ensureLinearString(rope);
+
+// GC with them all live.
+let ropes2 = createRopes();
+gc();
+
+// GC with them all dead.
+ropes2 = null;
+gc();
+
+if (typeof reportCompare === "function")
+ reportCompare(true, true);