Fix a race between concurrent recompilation and OSR.

test/mjsunit/regress-330046.js

Index: test/mjsunit/regress-330046.js
diff --git a/test/mjsunit/regress/regress-int32-truncation.js b/test/mjsunit/regress-330046.js
similarity index 69%
copy from test/mjsunit/regress/regress-int32-truncation.js
copy to test/mjsunit/regress-330046.js
index dec4ac1195a6c4928d84eac8cc8dc9496bf66600..d94b804ac0a974d94de784b02b7a2b1f6c8a6f25 100644
--- a/test/mjsunit/regress/regress-int32-truncation.js
+++ b/test/mjsunit/regress-330046.js
@@ -25,37 +25,37 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --allow-natives-syntax
+// Flags: --use-osr --allow-natives-syntax --crankshaft
 
-function f(i, b) {
-  var a = 0;
-  if (b) {
-    var c = 1 << i;
-    a = c + c;
+var o1 = {a : 10};
+var o2 = { };
+o2.__proto__ = o1;
+var o3 = { };
+o3.__proto__ = o2;
+
+function f(n, x, b) {
+  var sum = x.a;
+  for (var i = 0; i < n; i++) {
+    sum = 1.0 / i;
   }
-  var x = a >> 3;
-  return a;
+  return sum;
 }
 
-f(1, false);
-f(1, true);
-%OptimizeFunctionOnNextCall(f);
-assertEquals((1 << 30) * 2, f(30, true));
-
+f(10, o3);
+f(20, o3);
+f(30, o3);
+%OptimizeFunctionOnNextCall(f, "concurrent");
+f(100000, o3);
+// At this point OSR replaces already optimized code.
+// Check that it evicts old code from cache.
 
-var global = 1;
+// This causes all code for f to be lazily deopted.
+o2.a = 5;
 
-function f2(b) {
-  var a = 0;
-  if (b) {
-    a = global;
-  }
-  var x = a >> 3;
-  return a;
-}
+// If OSR did not evict the old code, it will be installed in f here.
+%OptimizeFunctionOnNextCall(f);
+f(10, o3);
 
-f2(false);
-f2(true);
-%OptimizeFunctionOnNextCall(f2);
-global = 2.5;
-assertEquals(global, f2(true));
+// The old code is already deoptimized, but f still points to it.
+// Disassembling it will crash.
+%DebugDisassembleFunction(f);