Bug 1028418 - Part 7: Tests for caching edge cases; r=shu

js/src/jit-test/tests/saved-stacks/caching-and-ccws.js

@@ -0,0 +1,35 @@
+// Test that the SavedFrame caching doesn't get messed up in the presence of
+// cross-compartment calls.
+
+const funcSource = "function call(f) { return f(); }";
+
+const g1 = newGlobal();
+const g2 = newGlobal();
+
+g1.eval(funcSource);
+g2.eval(funcSource);
+eval(funcSource);
+
+function doSaveStack() {
+  return saveStack();
+}
+
+const captureStacksAcrossCompartmens = () =>
+  [this, g1, g2].map(g => g.call(doSaveStack));
+
+(function f0() {
+  const stacks = [];
+
+  for (var i = 0; i < 2; i++)
+    stacks.push(...captureStacksAcrossCompartmens());
+
+  const [s1, s2, s3, s4, s5, s6] = stacks;
+
+  assertEq(s1 != s2, true);
+  assertEq(s2 != s3, true);
+  assertEq(s3 != s1, true);
+
+  assertEq(s1, s4);
+  assertEq(s2, s5);
+  assertEq(s3, s6);
+}());

js/src/jit-test/tests/saved-stacks/caching-and-frame-count.js

@@ -0,0 +1,38 @@
+// Test that the SavedFrame caching doesn't mess up counts. Specifically, that
+// if we capture only the first n frames of a stack, we don't cache that stack
+// and return it for when someone else captures another stack and asks for more
+// frames than that last time.
+
+function stackLength(stack) {
+  return stack === null
+    ? 0
+    : 1 + stackLength(stack.parent);
+}
+
+(function f0() {
+  (function f1() {
+    (function f2() {
+      (function f3() {
+        (function f4() {
+          (function f5() {
+            (function f6() {
+              (function f7() {
+                (function f8() {
+                  (function f9() {
+                    const s1 = saveStack(3);
+                    const s2 = saveStack(5);
+                    const s3 = saveStack(0 /* no limit */);
+
+                    assertEq(stackLength(s1), 3);
+                    assertEq(stackLength(s2), 5);
+                    assertEq(stackLength(s3), 11);
+                  }());
+                }());
+              }());
+            }());
+          }());
+        }());
+      }());
+    }());
+  }());
+}());