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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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tree10027f336435511475e392454359edea8e25895d /js/src/jit-test/tests/debug/gc-05.js
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'js/src/jit-test/tests/debug/gc-05.js')
-rw-r--r--js/src/jit-test/tests/debug/gc-05.js41
1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/debug/gc-05.js b/js/src/jit-test/tests/debug/gc-05.js
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+// If a Debugger survives its debuggee, its object cache must still be swept.
+
+var g2arr = []; // non-debuggee globals
+var xarr = []; // debuggee objects
+
+var N = 4, M = 4;
+for (var i = 0; i < N; i++) {
+ var g1 = newGlobal();
+ g1.M = M;
+ var dbg = new Debugger(g1);
+ var g2 = g1.eval("newGlobal('same-compartment')");
+ g1.x = g2.eval("x = {};");
+
+ dbg.onDebuggerStatement = function (frame) { xarr.push(frame.eval("x").return); };
+ g1.eval("debugger;");
+ g2arr.push(g2);
+
+ g1 = null;
+ gc();
+}
+
+// At least some of the debuggees have probably been collected at this
+// point. It is nondeterministic, though.
+assertEq(g2arr.length, N);
+assertEq(xarr.length, N);
+
+// Try to make g2arr[i].eval eventually allocate a new object in the same
+// location as a previously gc'd object. If the object caches are not being
+// swept, the pointer coincidence will cause a Debugger.Object to be erroneously
+// reused.
+for (var i = 0; i < N; i++) {
+ var obj = xarr[i];
+ for (j = 0; j < M; j++) {
+ assertEq(obj instanceof Debugger.Object, true);
+ g2arr[i].eval("x = x.prop = {};");
+ obj = obj.getOwnPropertyDescriptor("prop").value;;
+ assertEq("seen" in obj, false);
+ obj.seen = true;
+ gc();
+ }
+}