Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 97 insertions, 0 deletions

diff --git a/js/public/shadow/Zone.h b/js/public/shadow/Zone.h
new file mode 100644
index 0000000000..a8d9c70dc4
--- /dev/null
+++ b/js/public/shadow/Zone.h
@@ -0,0 +1,97 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Shadow definition of |JS::Zone| innards.  Do not use this directly! */
+
+#ifndef js_shadow_Zone_h
+#define js_shadow_Zone_h
+
+#include "mozilla/Assertions.h"  // MOZ_ASSERT
+
+#include <stdint.h>  // uint8_t, uint32_t
+
+#include "jspubtd.h"  // js::CurrentThreadCanAccessRuntime
+
+struct JS_PUBLIC_API JSRuntime;
+class JS_PUBLIC_API JSTracer;
+
+namespace JS {
+
+namespace shadow {
+
+struct Zone {
+  enum GCState : uint8_t {
+    NoGC,
+    Prepare,
+    MarkBlackOnly,
+    MarkBlackAndGray,
+    Sweep,
+    Finished,
+    Compact
+  };
+
+  enum Kind : uint8_t { NormalZone, AtomsZone, SelfHostingZone, SystemZone };
+
+ protected:
+  JSRuntime* const runtime_;
+  JSTracer* const barrierTracer_;  // A pointer to the JSRuntime's |gcMarker|.
+  uint32_t needsIncrementalBarrier_ = 0;
+  GCState gcState_ = NoGC;
+  const Kind kind_;
+
+  Zone(JSRuntime* runtime, JSTracer* barrierTracerArg, Kind kind)
+      : runtime_(runtime), barrierTracer_(barrierTracerArg), kind_(kind) {}
+
+ public:
+  bool needsIncrementalBarrier() const { return needsIncrementalBarrier_; }
+
+  JSTracer* barrierTracer() {
+    MOZ_ASSERT(needsIncrementalBarrier_);
+    MOZ_ASSERT(js::CurrentThreadCanAccessRuntime(runtime_));
+    return barrierTracer_;
+  }
+
+  JSRuntime* runtimeFromMainThread() const {
+    MOZ_ASSERT(js::CurrentThreadCanAccessRuntime(runtime_));
+    return runtime_;
+  }
+
+  // Note: Unrestricted access to the zone's runtime from an arbitrary
+  // thread can easily lead to races. Use this method very carefully.
+  JSRuntime* runtimeFromAnyThread() const { return runtime_; }
+
+  GCState gcState() const { return gcState_; }
+  bool wasGCStarted() const { return gcState_ != NoGC; }
+  bool isGCPreparing() const { return gcState_ == Prepare; }
+  bool isGCMarkingBlackOnly() const { return gcState_ == MarkBlackOnly; }
+  bool isGCMarkingBlackAndGray() const { return gcState_ == MarkBlackAndGray; }
+  bool isGCSweeping() const { return gcState_ == Sweep; }
+  bool isGCFinished() const { return gcState_ == Finished; }
+  bool isGCCompacting() const { return gcState_ == Compact; }
+  bool isGCMarking() const {
+    return isGCMarkingBlackOnly() || isGCMarkingBlackAndGray();
+  }
+  bool isGCMarkingOrSweeping() const {
+    return gcState_ >= MarkBlackOnly && gcState_ <= Sweep;
+  }
+  bool isGCSweepingOrCompacting() const {
+    return gcState_ == Sweep || gcState_ == Compact;
+  }
+
+  bool isAtomsZone() const { return kind_ == AtomsZone; }
+  bool isSelfHostingZone() const { return kind_ == SelfHostingZone; }
+  bool isSystemZone() const { return kind_ == SystemZone; }
+
+  static shadow::Zone* from(JS::Zone* zone) {
+    return reinterpret_cast<shadow::Zone*>(zone);
+  }
+};
+
+}  // namespace shadow
+
+}  // namespace JS
+
+#endif  // js_shadow_Zone_h