react-native/ReactCommon/cxxreact/JSCMemory.cpp

// Copyright (c) Facebook, Inc. and its affiliates.

// This source code is licensed under the MIT license found in the
// LICENSE file in the root directory of this source tree.

#include "JSCMemory.h"

#ifdef WITH_FB_MEMORY_PROFILING

#include <stdio.h>
#include <string.h>
#include <JavaScriptCore/API/JSProfilerPrivate.h>
#include <jschelpers/JSCHelpers.h>
#include <jschelpers/Value.h>

using namespace facebook::react;

static JSValueRef nativeCaptureHeap(
    JSContextRef ctx,
    JSObjectRef function,
    JSObjectRef thisObject,
    size_t argumentCount,
    const JSValueRef arguments[],
    JSValueRef* exception) {
  if (argumentCount < 1) {
    if (exception) {
      *exception = Value::makeError(
        ctx,
        "nativeCaptureHeap requires the path to save the capture");
    }
    return Value::makeUndefined(ctx);
  }

  auto outputFilename = Value(ctx, arguments[0]).toString();
  JSCaptureHeap(ctx, outputFilename.str().c_str(), exception);
  return Value::makeUndefined(ctx);
}

#endif // WITH_FB_MEMORY_PROFILING

namespace facebook {
namespace react {

void addJSCMemoryHooks(JSGlobalContextRef ctx) {
#ifdef WITH_FB_MEMORY_PROFILING
  installGlobalFunction(ctx, "nativeCaptureHeap", nativeCaptureHeap);
#endif // WITH_FB_MEMORY_PROFILING
}

} }