Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 272 insertions, 0 deletions

diff --git a/js/src/gc/PublicIterators.cpp b/js/src/gc/PublicIterators.cpp
new file mode 100644
index 0000000000..582a21ddf3
--- /dev/null
+++ b/js/src/gc/PublicIterators.cpp
@@ -0,0 +1,272 @@
+/* -*- 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/. */
+
+#include "gc/GCInternals.h"
+#include "gc/GCLock.h"
+#include "vm/Realm.h"
+#include "vm/Runtime.h"
+
+#include "gc/PrivateIterators-inl.h"
+
+using namespace js;
+using namespace js::gc;
+
+static void IterateRealmsArenasCellsUnbarriered(
+    JSContext* cx, Zone* zone, void* data,
+    JS::IterateRealmCallback realmCallback, IterateArenaCallback arenaCallback,
+    IterateCellCallback cellCallback, const JS::AutoRequireNoGC& nogc) {
+  {
+    Rooted<Realm*> realm(cx);
+    for (RealmsInZoneIter r(zone); !r.done(); r.next()) {
+      realm = r;
+      (*realmCallback)(cx, data, realm, nogc);
+    }
+  }
+
+  for (auto thingKind : AllAllocKinds()) {
+    JS::TraceKind traceKind = MapAllocToTraceKind(thingKind);
+    size_t thingSize = Arena::thingSize(thingKind);
+
+    for (ArenaIter aiter(zone, thingKind); !aiter.done(); aiter.next()) {
+      Arena* arena = aiter.get();
+      (*arenaCallback)(cx->runtime(), data, arena, traceKind, thingSize, nogc);
+      for (ArenaCellIter cell(arena); !cell.done(); cell.next()) {
+        (*cellCallback)(cx->runtime(), data, JS::GCCellPtr(cell, traceKind),
+                        thingSize, nogc);
+      }
+    }
+  }
+}
+
+void js::IterateHeapUnbarriered(JSContext* cx, void* data,
+                                IterateZoneCallback zoneCallback,
+                                JS::IterateRealmCallback realmCallback,
+                                IterateArenaCallback arenaCallback,
+                                IterateCellCallback cellCallback) {
+  AutoPrepareForTracing prep(cx);
+  JS::AutoSuppressGCAnalysis nogc(cx);
+
+  auto iterateZone = [&](Zone* zone) -> void {
+    (*zoneCallback)(cx->runtime(), data, zone, nogc);
+    IterateRealmsArenasCellsUnbarriered(cx, zone, data, realmCallback,
+                                        arenaCallback, cellCallback, nogc);
+  };
+
+  // Include the shared atoms zone if present.
+  if (Zone* zone = cx->runtime()->gc.maybeSharedAtomsZone()) {
+    iterateZone(zone);
+  }
+
+  for (ZonesIter zone(cx->runtime(), WithAtoms); !zone.done(); zone.next()) {
+    iterateZone(zone);
+  }
+}
+
+void js::IterateHeapUnbarrieredForZone(JSContext* cx, Zone* zone, void* data,
+                                       IterateZoneCallback zoneCallback,
+                                       JS::IterateRealmCallback realmCallback,
+                                       IterateArenaCallback arenaCallback,
+                                       IterateCellCallback cellCallback) {
+  AutoPrepareForTracing prep(cx);
+  JS::AutoSuppressGCAnalysis nogc(cx);
+
+  (*zoneCallback)(cx->runtime(), data, zone, nogc);
+  IterateRealmsArenasCellsUnbarriered(cx, zone, data, realmCallback,
+                                      arenaCallback, cellCallback, nogc);
+}
+
+void js::IterateChunks(JSContext* cx, void* data,
+                       IterateChunkCallback chunkCallback) {
+  AutoPrepareForTracing prep(cx);
+  AutoLockGC lock(cx->runtime());
+  JS::AutoSuppressGCAnalysis nogc(cx);
+
+  for (auto chunk = cx->runtime()->gc.allNonEmptyChunks(lock); !chunk.done();
+       chunk.next()) {
+    chunkCallback(cx->runtime(), data, chunk, nogc);
+  }
+}
+
+static void TraverseInnerLazyScriptsForLazyScript(
+    JSContext* cx, void* data, BaseScript* enclosingScript,
+    IterateScriptCallback lazyScriptCallback, const JS::AutoRequireNoGC& nogc) {
+  for (JS::GCCellPtr gcThing : enclosingScript->gcthings()) {
+    if (!gcThing.is<JSObject>()) {
+      continue;
+    }
+    JSObject* obj = &gcThing.as<JSObject>();
+
+    MOZ_ASSERT(obj->is<JSFunction>(),
+               "All objects in lazy scripts should be functions");
+    JSFunction* fun = &obj->as<JSFunction>();
+
+    if (!fun->hasBaseScript()) {
+      // Ignore asm.js.
+      continue;
+    }
+    MOZ_ASSERT(fun->baseScript());
+    if (!fun->baseScript()) {
+      // If the function doesn't have script, ignore it.
+      continue;
+    }
+
+    if (fun->hasBytecode()) {
+      // Ignore non lazy function.
+      continue;
+    }
+
+    // If the function is "ghost", we shouldn't expose it to the debugger.
+    //
+    // See GHOST_FUNCTION in FunctionFlags.h for more details.
+    if (fun->isGhost()) {
+      continue;
+    }
+
+    BaseScript* script = fun->baseScript();
+    MOZ_ASSERT_IF(script->hasEnclosingScript(),
+                  script->enclosingScript() == enclosingScript);
+
+    lazyScriptCallback(cx->runtime(), data, script, nogc);
+
+    TraverseInnerLazyScriptsForLazyScript(cx, data, script, lazyScriptCallback,
+                                          nogc);
+  }
+}
+
+static inline void DoScriptCallback(JSContext* cx, void* data,
+                                    BaseScript* script,
+                                    IterateScriptCallback callback,
+                                    const JS::AutoRequireNoGC& nogc) {
+  // Exclude any scripts that may be the result of a failed compile. Check that
+  // script either has bytecode or is ready to delazify.
+  //
+  // This excludes lazy scripts that do not have an enclosing scope because we
+  // cannot distinguish a failed compile fragment from a lazy script with a lazy
+  // parent.
+  if (!script->hasBytecode() && !script->isReadyForDelazification()) {
+    return;
+  }
+
+  // Invoke callback.
+  callback(cx->runtime(), data, script, nogc);
+
+  // The check above excluded lazy scripts with lazy parents, so explicitly
+  // visit inner scripts now if we are lazy with a successfully compiled parent.
+  if (!script->hasBytecode()) {
+    TraverseInnerLazyScriptsForLazyScript(cx, data, script, callback, nogc);
+  }
+}
+
+void js::IterateScripts(JSContext* cx, Realm* realm, void* data,
+                        IterateScriptCallback scriptCallback) {
+  MOZ_ASSERT(!cx->suppressGC);
+  AutoEmptyNurseryAndPrepareForTracing prep(cx);
+  JS::AutoSuppressGCAnalysis nogc;
+
+  if (realm) {
+    Zone* zone = realm->zone();
+    for (auto iter = zone->cellIter<BaseScript>(prep); !iter.done();
+         iter.next()) {
+      if (iter->realm() != realm) {
+        continue;
+      }
+      DoScriptCallback(cx, data, iter.get(), scriptCallback, nogc);
+    }
+  } else {
+    for (ZonesIter zone(cx->runtime(), SkipAtoms); !zone.done(); zone.next()) {
+      for (auto iter = zone->cellIter<BaseScript>(prep); !iter.done();
+           iter.next()) {
+        DoScriptCallback(cx, data, iter.get(), scriptCallback, nogc);
+      }
+    }
+  }
+}
+
+void js::IterateGrayObjects(Zone* zone, IterateGCThingCallback cellCallback,
+                            void* data) {
+  MOZ_ASSERT(!JS::RuntimeHeapIsBusy());
+
+  JSContext* cx = TlsContext.get();
+  AutoPrepareForTracing prep(cx);
+  JS::AutoSuppressGCAnalysis nogc(cx);
+
+  for (auto kind : ObjectAllocKinds()) {
+    for (GrayObjectIter obj(zone, kind); !obj.done(); obj.next()) {
+      if (obj->asTenured().isMarkedGray()) {
+        cellCallback(data, JS::GCCellPtr(obj.get()), nogc);
+      }
+    }
+  }
+}
+
+JS_PUBLIC_API void JS_IterateCompartments(
+    JSContext* cx, void* data,
+    JSIterateCompartmentCallback compartmentCallback) {
+  AutoTraceSession session(cx->runtime());
+
+  for (CompartmentsIter c(cx->runtime()); !c.done(); c.next()) {
+    if ((*compartmentCallback)(cx, data, c) ==
+        JS::CompartmentIterResult::Stop) {
+      break;
+    }
+  }
+}
+
+JS_PUBLIC_API void JS_IterateCompartmentsInZone(
+    JSContext* cx, JS::Zone* zone, void* data,
+    JSIterateCompartmentCallback compartmentCallback) {
+  AutoTraceSession session(cx->runtime());
+
+  for (CompartmentsInZoneIter c(zone); !c.done(); c.next()) {
+    if ((*compartmentCallback)(cx, data, c) ==
+        JS::CompartmentIterResult::Stop) {
+      break;
+    }
+  }
+}
+
+JS_PUBLIC_API void JS::IterateRealms(JSContext* cx, void* data,
+                                     JS::IterateRealmCallback realmCallback) {
+  AutoTraceSession session(cx->runtime());
+  JS::AutoSuppressGCAnalysis nogc(cx);
+
+  Rooted<Realm*> realm(cx);
+  for (RealmsIter r(cx->runtime()); !r.done(); r.next()) {
+    realm = r;
+    (*realmCallback)(cx, data, realm, nogc);
+  }
+}
+
+JS_PUBLIC_API void JS::IterateRealmsWithPrincipals(
+    JSContext* cx, JSPrincipals* principals, void* data,
+    JS::IterateRealmCallback realmCallback) {
+  MOZ_ASSERT(principals);
+
+  AutoTraceSession session(cx->runtime());
+  JS::AutoSuppressGCAnalysis nogc(cx);
+
+  Rooted<Realm*> realm(cx);
+  for (RealmsIter r(cx->runtime()); !r.done(); r.next()) {
+    if (r->principals() != principals) {
+      continue;
+    }
+    realm = r;
+    (*realmCallback)(cx, data, realm, nogc);
+  }
+}
+
+JS_PUBLIC_API void JS::IterateRealmsInCompartment(
+    JSContext* cx, JS::Compartment* compartment, void* data,
+    JS::IterateRealmCallback realmCallback) {
+  AutoTraceSession session(cx->runtime());
+  JS::AutoSuppressGCAnalysis nogc(cx);
+
+  Rooted<Realm*> realm(cx);
+  for (RealmsInCompartmentIter r(compartment); !r.done(); r.next()) {
+    realm = r;
+    (*realmCallback)(cx, data, realm, nogc);
+  }
+}