5 files changed, 4 insertions, 40 deletions
diff --git a/js/src/gc/GCRuntime.h b/js/src/gc/GCRuntime.h
index 5252903f3..a426d759b 100644
--- a/js/src/gc/GCRuntime.h
+++ b/js/src/gc/GCRuntime.h
@@ -600,7 +600,6 @@ class GCRuntime
     void finishRoots();
     void finish();
 
-    inline bool hasZealMode(ZealMode mode);
     inline void clearZealMode(ZealMode mode);
     inline bool upcomingZealousGC();
     inline bool needZealousGC();
@@ -1355,7 +1354,6 @@ class MOZ_RAII AutoMaybeStartBackgroundAllocation
     }
 };
 
-inline bool GCRuntime::hasZealMode(ZealMode mode) { return false; }
 inline void GCRuntime::clearZealMode(ZealMode mode) { }
 inline bool GCRuntime::upcomingZealousGC() { return false; }
 inline bool GCRuntime::needZealousGC() { return false; }
diff --git a/js/src/gc/Nursery.cpp b/js/src/gc/Nursery.cpp
index 3a3860d6d..72530b31b 100644
--- a/js/src/gc/Nursery.cpp
+++ b/js/src/gc/Nursery.cpp
@@ -219,11 +219,8 @@ js::Nursery::isEmpty() const
     MOZ_ASSERT(runtime_);
     if (!isEnabled())
         return true;
-
-    if (!runtime_->hasZealMode(ZealMode::GenerationalGC)) {
-        MOZ_ASSERT(currentStartChunk_ == 0);
-        MOZ_ASSERT(currentStartPosition_ == chunk(0).start());
-    }
+    MOZ_ASSERT(currentStartChunk_ == 0);
+    MOZ_ASSERT(currentStartPosition_ == chunk(0).start());
     return position() == currentStartPosition_;
 }
 
diff --git a/js/src/gc/Zone.h b/js/src/gc/Zone.h
index a3a6dc07f..84d6f03dd 100644
--- a/js/src/gc/Zone.h
+++ b/js/src/gc/Zone.h
@@ -253,11 +253,7 @@ struct Zone : public JS::shadow::Zone,
     // possibly at other times too.
     uint64_t gcNumber();
 
-    bool compileBarriers() const { return compileBarriers(needsIncrementalBarrier()); }
-    bool compileBarriers(bool needsIncrementalBarrier) const {
-        return needsIncrementalBarrier ||
-               runtimeFromMainThread()->hasZealMode(js::gc::ZealMode::VerifierPre);
-    }
+    bool compileBarriers() const { return needsIncrementalBarrier(); }
 
     enum ShouldUpdateJit { DontUpdateJit, UpdateJit };
     void setNeedsIncrementalBarrier(bool needs, ShouldUpdateJit updateJit);
diff --git a/js/src/jsgc.cpp b/js/src/jsgc.cpp
index 52a8c9f71..039d8f2b0 100644
--- a/js/src/jsgc.cpp
+++ b/js/src/jsgc.cpp
@@ -5359,21 +5359,9 @@ GCRuntime::incrementalCollectSlice(SliceBudget& budget, JS::gcreason::Reason rea
 
     gc::State initialState = incrementalState;
 
-    bool useZeal = false;
-
     MOZ_ASSERT_IF(isIncrementalGCInProgress(), isIncremental);
     isIncremental = !budget.isUnlimited();
 
-    if (useZeal && (hasZealMode(ZealMode::IncrementalRootsThenFinish) ||
-                    hasZealMode(ZealMode::IncrementalMarkAllThenFinish)))
-    {
-        /*
-         * Yields between slices occurs at predetermined points in these modes;
-         * the budget is not used.
-         */
-        budget.makeUnlimited();
-    }
-
     switch (incrementalState) {
       case State::NotActive:
         initialReason = reason;
@@ -5396,9 +5384,6 @@ GCRuntime::incrementalCollectSlice(SliceBudget& budget, JS::gcreason::Reason rea
 
         incrementalState = State::Mark;
 
-        if (isIncremental && useZeal && hasZealMode(ZealMode::IncrementalRootsThenFinish))
-            break;
-
         MOZ_FALLTHROUGH;
 
       case State::Mark:
@@ -5427,10 +5412,7 @@ GCRuntime::incrementalCollectSlice(SliceBudget& budget, JS::gcreason::Reason rea
          * We will need to mark anything new on the stack when we resume, so
          * we stay in Mark state.
          */
-        if (!lastMarkSlice && isIncremental &&
-            ((initialState == State::Mark &&
-              !(useZeal && hasZealMode(ZealMode::IncrementalRootsThenFinish))) ||
-             (useZeal && hasZealMode(ZealMode::IncrementalMarkAllThenFinish))))
+        if (!lastMarkSlice && isIncremental && initialState == State::Mark)
         {
             lastMarkSlice = true;
             break;
@@ -5446,13 +5428,6 @@ GCRuntime::incrementalCollectSlice(SliceBudget& budget, JS::gcreason::Reason rea
         if (budget.isOverBudget())
             break;
 
-        /*
-         * Always yield here when running in incremental multi-slice zeal
-         * mode, so RunDebugGC can reset the slice buget.
-         */
-        if (isIncremental && useZeal && hasZealMode(ZealMode::IncrementalMultipleSlices))
-            break;
-
         MOZ_FALLTHROUGH;
 
       case State::Sweep:
diff --git a/js/src/vm/Runtime.h b/js/src/vm/Runtime.h
index 4f7755b9d..734543c4e 100644
--- a/js/src/vm/Runtime.h
+++ b/js/src/vm/Runtime.h
@@ -866,8 +866,6 @@ struct JSRuntime : public JS::shadow::Runtime,
     /* Garbage collector state has been successfully initialized. */
     bool                gcInitialized;
 
-    bool hasZealMode(js::gc::ZealMode mode) { return gc.hasZealMode(mode); }
-
     void lockGC() {
         gc.lockGC();
     }