Add m-esr52 at 52.6.0

1 files changed, 38 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/debug/clear-old-analyses-01.js b/js/src/jit-test/tests/debug/clear-old-analyses-01.js
new file mode 100644
index 000000000..b566df17d
--- /dev/null
+++ b/js/src/jit-test/tests/debug/clear-old-analyses-01.js
@@ -0,0 +1,38 @@
+// |jit-test| error:AllDone
+// When we enter debug mode in a compartment, we must throw away all
+// analyses in that compartment (debug mode affects the results of
+// analysis, so they become out of date). This is true even when we would
+// otherwise be retaining jit code and its related data structures for
+// animation timing.
+
+if (typeof gcPreserveCode != "function")
+  throw('AllDone');
+
+var g = newGlobal();
+var dbg = new Debugger;
+
+g.eval("" +
+       function fib(n) {
+         var a = 0, b = 1;
+         while (n-- > 0)
+           b = b+a, a = b-a;
+         return b;
+       });
+
+g.fib(20);                      // Cause g.fib to be jitted. This creates an analysis with
+                                // debug mode off.
+
+gcPreserveCode();               // Tell the gc to preserve JIT code and analyses by
+                                // default. A recent call to js::NotifyAnimationActivity
+                                // could have a similar effect in real life.
+
+dbg.addDebuggee(g);             // Put g in debug mode. This triggers a GC which must
+                                // clear all analyses. In the original buggy code, we also
+                                // release all of g's scripts' JIT code, leading to a
+                                // recompilation the next time it was called.
+
+g.fib(20);                      // Run g.fib again, causing it to be re-jitted. If the
+                                // original analysis is still present, JM will assert,
+                                // because it is not in debug mode.
+
+throw('AllDone');