From 3ee73ca14cec9ac99ebee938d76650ad11aa98da Mon Sep 17 00:00:00 2001
From: janekptacijarabaci <janekptacijarabaci@seznam.cz>
Date: Tue, 20 Mar 2018 10:27:23 +0100
Subject: Bug 1322314 - Disallow emitting ParseNode twice

Issue #73
[Depends on] Bug 1147371: Implement IteratorClose
---
 js/src/frontend/BytecodeEmitter.cpp | 29 ++++-------------------------
 1 file changed, 4 insertions(+), 25 deletions(-)

(limited to 'js/src/frontend/BytecodeEmitter.cpp')

diff --git a/js/src/frontend/BytecodeEmitter.cpp b/js/src/frontend/BytecodeEmitter.cpp
index acf734794..ee26d0c43 100644
--- a/js/src/frontend/BytecodeEmitter.cpp
+++ b/js/src/frontend/BytecodeEmitter.cpp
@@ -6975,14 +6975,13 @@ BytecodeEmitter::emitFunction(ParseNode* pn, bool needsProto)
     RootedFunction fun(cx, funbox->function());
     RootedAtom name(cx, fun->explicitName());
     MOZ_ASSERT_IF(fun->isInterpretedLazy(), fun->lazyScript());
-    MOZ_ASSERT_IF(pn->isOp(JSOP_FUNWITHPROTO), needsProto);
 
     /*
      * Set the |wasEmitted| flag in the funbox once the function has been
      * emitted. Function definitions that need hoisting to the top of the
      * function will be seen by emitFunction in two places.
      */
-    if (funbox->wasEmitted && pn->functionIsHoisted()) {
+    if (funbox->wasEmitted) {
         // Annex B block-scoped functions are hoisted like any other
         // block-scoped function to the top of their scope. When their
         // definitions are seen for the second time, we need to emit the
@@ -7111,7 +7110,7 @@ BytecodeEmitter::emitFunction(ParseNode* pn, bool needsProto)
         }
 
         if (needsProto) {
-            MOZ_ASSERT(pn->getOp() == JSOP_FUNWITHPROTO || pn->getOp() == JSOP_LAMBDA);
+            MOZ_ASSERT(pn->getOp() == JSOP_LAMBDA);
             pn->setOp(JSOP_FUNWITHPROTO);
         }
 
@@ -10047,15 +10046,6 @@ CGConstList::finish(ConstArray* array)
         array->vector[i] = list[i];
 }
 
-bool
-CGObjectList::isAdded(ObjectBox* objbox)
-{
-    // An objbox added to CGObjectList as non-first element has non-null
-    // emitLink member.  The first element has null emitLink.
-    // Check for firstbox to cover the first element.
-    return objbox->emitLink || objbox == firstbox;
-}
-
 /*
  * Find the index of the given object for code generator.
  *
@@ -10067,15 +10057,9 @@ CGObjectList::isAdded(ObjectBox* objbox)
 unsigned
 CGObjectList::add(ObjectBox* objbox)
 {
-    if (isAdded(objbox))
-        return indexOf(objbox->object);
-
+    MOZ_ASSERT(!objbox->emitLink);
     objbox->emitLink = lastbox;
     lastbox = objbox;
-
-    // See the comment in CGObjectList::isAdded.
-    if (!firstbox)
-        firstbox = objbox;
     return length++;
 }
 
@@ -10102,12 +10086,7 @@ CGObjectList::finish(ObjectArray* array)
         MOZ_ASSERT(!*cursor);
         MOZ_ASSERT(objbox->object->isTenured());
         *cursor = objbox->object;
-
-        ObjectBox* tmp = objbox->emitLink;
-        // Clear emitLink for CGObjectList::isAdded.
-        objbox->emitLink = nullptr;
-        objbox = tmp;
-    } while (objbox != nullptr);
+    } while ((objbox = objbox->emitLink) != nullptr);
     MOZ_ASSERT(cursor == array->vector);
 }
 
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