Move benchmark buck file into benchmark directory

Summary: buck rules are not meant to be in the root buck file but instead next to source files. This diff moves benchmark rule into benchmark folder.

Reviewed By: lucasr

Differential Revision: D3992992

fbshipit-source-id: 34782ff73bbd5b799d83d0f01b553bfab928f1df

benchmark/CSSBenchmark.c

@@ -0,0 +1,83 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#include "CSSBenchmark.h"
+
+#include <CSSLayout/CSSLayout.h>
+#include <time.h>
+
+// Measure functions can be quite slow, for example when measuring text.
+// Simulate this by sleeping for 1 millisecond.
+static CSSSize _measure(void *context,
+                        float width,
+                        CSSMeasureMode widthMode,
+                        float height,
+                        CSSMeasureMode heightMode) {
+  const struct timespec sleeptime = {0, 1000000};
+  nanosleep(&sleeptime, NULL);
+  return (CSSSize){
+      .width = widthMode == CSSMeasureModeUndefined ? 10 : width,
+      .height = heightMode == CSSMeasureModeUndefined ? 10 : width,
+  };
+}
+
+CSS_BENCHMARKS({
+
+  CSS_BENCHMARK("Stack with flex", {
+    const CSSNodeRef root = CSSNodeNew();
+    CSSNodeStyleSetWidth(root, 100);
+    CSSNodeStyleSetHeight(root, 100);
+
+    for (uint32_t i = 0; i < 10; i++) {
+      const CSSNodeRef child = CSSNodeNew();
+      CSSNodeSetMeasureFunc(child, _measure);
+      CSSNodeStyleSetFlex(child, 1);
+      CSSNodeInsertChild(root, child, 0);
+    }
+
+    CSSNodeCalculateLayout(root, CSSUndefined, CSSUndefined, CSSDirectionLTR);
+    CSSNodeFreeRecursive(root);
+  });
+
+  CSS_BENCHMARK("Align stretch in undefined axis", {
+    const CSSNodeRef root = CSSNodeNew();
+
+    for (uint32_t i = 0; i < 10; i++) {
+      const CSSNodeRef child = CSSNodeNew();
+      CSSNodeStyleSetHeight(child, 20);
+      CSSNodeSetMeasureFunc(child, _measure);
+      CSSNodeInsertChild(root, child, 0);
+    }
+
+    CSSNodeCalculateLayout(root, CSSUndefined, CSSUndefined, CSSDirectionLTR);
+    CSSNodeFreeRecursive(root);
+  });
+
+  CSS_BENCHMARK("Nested flex", {
+    const CSSNodeRef root = CSSNodeNew();
+
+    for (uint32_t i = 0; i < 10; i++) {
+      const CSSNodeRef child = CSSNodeNew();
+      CSSNodeSetMeasureFunc(child, _measure);
+      CSSNodeStyleSetFlex(child, 1);
+      CSSNodeInsertChild(root, child, 0);
+
+      for (uint32_t ii = 0; ii < 10; ii++) {
+        const CSSNodeRef grandChild = CSSNodeNew();
+        CSSNodeSetMeasureFunc(grandChild, _measure);
+        CSSNodeStyleSetFlex(grandChild, 1);
+        CSSNodeInsertChild(child, grandChild, 0);
+      }
+    }
+
+    CSSNodeCalculateLayout(root, CSSUndefined, CSSUndefined, CSSDirectionLTR);
+    CSSNodeFreeRecursive(root);
+  });
+
+});