Bug 1332881 - Handle stack value in correct order when leaving loop and try-finally

Issue #74

js/src/frontend/BytecodeEmitter.cpp

@@ -2359,6 +2359,9 @@ NonLocalExitControl::prepareForNonLocalJump(BytecodeEmitter::NestableControl* ta
           }
 
           case StatementKind::ForOfLoop:
+            if (!flushPops(bce_))
+                return false;
+
             // The iterator and the current value are on the stack.
             //
             if (emitIteratorClose) {
@@ -2378,6 +2381,9 @@ NonLocalExitControl::prepareForNonLocalJump(BytecodeEmitter::NestableControl* ta
             break;
 
           case StatementKind::ForInLoop:
+            if (!flushPops(bce_))
+                return false;
+
             // The iterator and the current value are on the stack.
             if (!bce_->emit1(JSOP_POP))                   // ... ITER
                 return false;

js/src/tests/ecma_6/Statements/for-inof-finally.js

@@ -0,0 +1,54 @@
+var BUGNUMBER = 1332881;
+var summary =
+  "Leaving for-in and try should handle stack value in correct order";
+
+print(BUGNUMBER + ": " + summary);
+
+var a = (function () {
+    for (var x in [0]) {
+        try {} finally {
+            return 11;
+        }
+    }
+})();
+assertEq(a, 11);
+
+var b = (function () {
+    for (var x of [0]) {
+        try {} finally {
+            return 12;
+        }
+    }
+})();
+assertEq(b, 12);
+
+var c = (function () {
+    for (var x in [0]) {
+        for (var y of [0]) {
+            try {} finally {
+                return 13;
+            }
+        }
+    }
+})();
+assertEq(c, 13);
+
+var d = (function () {
+    for (var x in [0]) {
+        for (var y of [0]) {
+            try {} finally {
+                for (var z in [0]) {
+                    for (var w of [0]) {
+                        try {} finally {
+                            return 14;
+                        }
+                    }
+                }
+            }
+        }
+    }
+})();
+assertEq(d, 14);
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);