1 files changed, 64 insertions, 0 deletions
diff --git a/toolkit/components/glean/bindings/private/MemoryDistribution.cpp b/toolkit/components/glean/bindings/private/MemoryDistribution.cpp
new file mode 100644
index 0000000000..82043d8ddb
--- /dev/null
+++ b/toolkit/components/glean/bindings/private/MemoryDistribution.cpp
@@ -0,0 +1,64 @@
+/* -*- 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 "mozilla/glean/bindings/MemoryDistribution.h"
+
+#include "mozilla/Components.h"
+#include "nsIClassInfoImpl.h"
+#include "nsJSUtils.h"
+#include "nsPrintfCString.h"
+#include "nsString.h"
+
+namespace mozilla::glean {
+
+NS_IMPL_CLASSINFO(GleanMemoryDistribution, nullptr, 0, {0})
+NS_IMPL_ISUPPORTS_CI(GleanMemoryDistribution, nsIGleanMemoryDistribution)
+
+NS_IMETHODIMP
+GleanMemoryDistribution::Accumulate(uint64_t aSample) {
+  mMemoryDist.Accumulate(aSample);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+GleanMemoryDistribution::TestGetValue(const nsACString& aPingName,
+                                      JSContext* aCx,
+                                      JS::MutableHandleValue aResult) {
+  auto result = mMemoryDist.TestGetValue(aPingName);
+  if (result.isNothing()) {
+    aResult.set(JS::UndefinedValue());
+  } else {
+    // Build return value of the form: { sum: #, values: {bucket1: count1, ...}
+    JS::RootedObject root(aCx, JS_NewPlainObject(aCx));
+    if (!root) {
+      return NS_ERROR_FAILURE;
+    }
+    uint64_t sum = result.ref().sum;
+    if (!JS_DefineProperty(aCx, root, "sum", static_cast<double>(sum),
+                           JSPROP_ENUMERATE)) {
+      return NS_ERROR_FAILURE;
+    }
+    JS::RootedObject valuesObj(aCx, JS_NewPlainObject(aCx));
+    if (!valuesObj ||
+        !JS_DefineProperty(aCx, root, "values", valuesObj, JSPROP_ENUMERATE)) {
+      return NS_ERROR_FAILURE;
+    }
+    auto& data = result.ref().values;
+    for (auto iter = data.ConstIter(); !iter.Done(); iter.Next()) {
+      const uint64_t bucket = iter.Key();
+      const uint64_t count = iter.UserData();
+      if (!JS_DefineProperty(aCx, valuesObj,
+                             nsPrintfCString("%" PRIu64, bucket).get(),
+                             static_cast<double>(count), JSPROP_ENUMERATE)) {
+        return NS_ERROR_FAILURE;
+      }
+    }
+    aResult.setObject(*root);
+  }
+  return NS_OK;
+}
+
+}  // namespace mozilla::glean