Make js perf API available to js

Reviewed By: tadeuzagallo

Differential Revision: D3011680

fb-gh-sync-id: 051864689af0b9041318cc314d339ae841fe35aa
shipit-source-id: 051864689af0b9041318cc314d339ae841fe35aa

ReactAndroid/src/main/jni/react/BUCK

@@ -54,6 +54,7 @@ react_library(
     'MethodCall.cpp',
     'JSCHelpers.cpp',
     'JSCExecutor.cpp',
+    'JSCPerfStats.cpp',
     'JSCTracing.cpp',
     'JSCMemory.cpp',
     'JSCLegacyProfiler.cpp',
@@ -63,6 +64,7 @@ react_library(
     'JSCTracing.h',
     'JSCLegacyProfiler.h',
     'JSCMemory.h',
+    'JSCPerfStats.h',
   ],
   exported_headers = [
     'Bridge.h',

ReactAndroid/src/main/jni/react/JSCExecutor.cpp

@@ -40,6 +40,10 @@ using fbsystrace::FbSystraceSection;
 #include <jsc_config_android.h>
 #endif
 
+#ifdef JSC_HAS_PERF_STATS_API
+#include "JSCPerfStats.h"
+#endif
+
 static const int64_t NANOSECONDS_IN_SECOND = 1000000000LL;
 static const int64_t NANOSECONDS_IN_MILLISECOND = 1000000LL;
 
@@ -179,6 +183,10 @@ void JSCExecutor::initOnJSVMThread() {
   #ifdef WITH_FB_MEMORY_PROFILING
   addNativeMemoryHooks(m_context);
   #endif
+
+  #ifdef JSC_HAS_PERF_STATS_API
+  addJSCPerfStatsHooks(m_context);
+  #endif
 }
 
 void JSCExecutor::terminateOnJSVMThread() {

ReactAndroid/src/main/jni/react/JSCPerfStats.cpp

@@ -0,0 +1,65 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+#include "JSCPerfStats.h"
+
+#ifdef JSC_HAS_PERF_STATS_API
+
+#include <JavaScriptCore/JSPerfStats.h>
+#include <JavaScriptCore/JSValueRef.h>
+
+#include "JSCHelpers.h"
+#include "Value.h"
+
+static JSValueRef nativeGetHeapStats(
+    JSContextRef ctx,
+    JSObjectRef function,
+    JSObjectRef thisObject,
+    size_t argumentCount,
+    const JSValueRef arguments[],
+    JSValueRef* exception) {
+  JSHeapStats heapStats = {0};
+  JSGetHeapStats(ctx, &heapStats);
+
+  auto result = facebook::react::Object::create(ctx);
+  result.setProperty("size", {ctx, JSValueMakeNumber(ctx, heapStats.size)});
+  result.setProperty("extra_size", {ctx, JSValueMakeNumber(ctx, heapStats.extraSize)});
+  result.setProperty("capacity", {ctx, JSValueMakeNumber(ctx, heapStats.capacity)});
+  result.setProperty("object_count", {ctx, JSValueMakeNumber(ctx, heapStats.objectCount)});
+
+  return (JSObjectRef) result;
+}
+
+static JSValueRef nativeGetGCStats(
+    JSContextRef ctx,
+    JSObjectRef function,
+    JSObjectRef thisObject,
+    size_t argumentCount,
+    const JSValueRef arguments[],
+    JSValueRef* exception) {
+  JSGCStats gcStats = {0};
+  JSGetGCStats(ctx, &gcStats);
+
+  auto result = facebook::react::Object::create(ctx);
+  result.setProperty(
+      "last_full_gc_length",
+      {ctx, JSValueMakeNumber(ctx, gcStats.lastFullGCLength)});
+  result.setProperty(
+      "last_eden_gc_length",
+      {ctx, JSValueMakeNumber(ctx, gcStats.lastEdenGCLength)});
+
+  return (JSObjectRef) result;
+}
+
+#endif
+
+namespace facebook {
+namespace react {
+
+void addJSCPerfStatsHooks(JSGlobalContextRef ctx) {
+#ifdef JSC_HAS_PERF_STATS_API
+  installGlobalFunction(ctx, "nativeGetHeapStats", nativeGetHeapStats);
+  installGlobalFunction(ctx, "nativeGetGCStats", nativeGetGCStats);
+#endif
+}
+
+} }

ReactAndroid/src/main/jni/react/JSCPerfStats.h

@@ -0,0 +1,12 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+#pragma once
+
+#include <JavaScriptCore/JSContextRef.h>
+
+namespace facebook {
+namespace react {
+
+void addJSCPerfStatsHooks(JSGlobalContextRef ctx);
+
+} }