From 9e00a42fd7067dbb8a17a8c8b6262d0aeb814b84 Mon Sep 17 00:00:00 2001
From: Ashok Menon <ashokmenon@fb.com>
Date: Fri, 18 Nov 2016 05:01:09 -0800
Subject: [PATCH] Experimental App Bundle API

Reviewed By: michalgr

Differential Revision: D4198629

fbshipit-source-id: b96a4b3ad3e5ab6b4cb8892442c6077edf7058a3
---
 ReactCommon/cxxreact/Executor.cpp    |  8 ++++++++
 ReactCommon/cxxreact/Executor.h      | 14 +++++++++++++-
 ReactCommon/cxxreact/JSCExecutor.cpp | 29 ++++++++++++++++++++++++++++
 ReactCommon/cxxreact/JSCExecutor.h   | 17 ++++++++++++++++
 4 files changed, 67 insertions(+), 1 deletion(-)

diff --git a/ReactCommon/cxxreact/Executor.cpp b/ReactCommon/cxxreact/Executor.cpp
index 54ae86f0d..1fec2ca21 100644
--- a/ReactCommon/cxxreact/Executor.cpp
+++ b/ReactCommon/cxxreact/Executor.cpp
@@ -22,6 +22,14 @@ void JSExecutor::loadApplicationScript(std::string bundlePath, std::string sourc
       std::move(sourceURL));
 }
 
+void JSExecutor::loadApplicationScript(int fd, std::string sourceURL) {
+  struct stat fileInfo;
+  folly::checkUnixError(::fstat(fd, &fileInfo), "fstat on bundle failed.");
+
+  auto bundle = folly::make_unique<JSBigFileString>(fd, fileInfo.st_size);
+  return loadApplicationScript(std::move(bundle), std::move(sourceURL));
+}
+
 static JSBigOptimizedBundleString::Encoding encodingFromByte(uint8_t byte) {
   switch (byte) {
   case 0:
diff --git a/ReactCommon/cxxreact/Executor.h b/ReactCommon/cxxreact/Executor.h
index 6f2f83fdc..7120c15c1 100644
--- a/ReactCommon/cxxreact/Executor.h
+++ b/ReactCommon/cxxreact/Executor.h
@@ -182,7 +182,11 @@ public:
   const char *c_str() const override {
     if (!m_data) {
       m_data = (const char *)mmap(0, m_size, PROT_READ, MAP_SHARED, m_fd, m_mapOff);
-      CHECK(m_data != MAP_FAILED);
+      CHECK(m_data != MAP_FAILED)
+        << " fd: " << m_fd
+        << " size: " << m_size
+        << " offset: " << m_mapOff
+        << " error: " << std::strerror(errno);
     }
     return m_data + m_pageOff;
   }
@@ -279,6 +283,14 @@ public:
    */
   virtual void loadApplicationScript(std::string bundlePath, std::string source, int flags);
 
+  /**
+   * @experimental
+   *
+   * Read an app bundle from a file descriptor, determine how it should be
+   * loaded, load and execute it in the JS context.
+   */
+  virtual void loadApplicationScript(int fd, std::string source);
+
   /**
    * Add an application "unbundle" file
    */
diff --git a/ReactCommon/cxxreact/JSCExecutor.cpp b/ReactCommon/cxxreact/JSCExecutor.cpp
index 1f9b3bee8..f84dd637f 100644
--- a/ReactCommon/cxxreact/JSCExecutor.cpp
+++ b/ReactCommon/cxxreact/JSCExecutor.cpp
@@ -363,6 +363,35 @@ void JSCExecutor::loadApplicationScript(
 }
 #endif
 
+#ifdef WITH_FBJSCEXTENSIONS
+void JSCExecutor::loadApplicationScript(
+    int fd,
+    std::string sourceURL)
+{
+  String jsSourceURL {sourceURL.c_str()};
+
+  auto bcSourceCode = JSCreateCompiledSourceCode(fd, jsSourceURL);
+  if (!bcSourceCode) {
+    // Not bytecode, fall through.
+    return JSExecutor::loadApplicationScript(fd, sourceURL);
+  }
+
+  ReactMarker::logMarker("RUN_JS_BUNDLE_START");
+
+  evaluateSourceCode(m_context, bcSourceCode, jsSourceURL);
+
+  // TODO(luk): t13903306 Remove this check once we make native modules
+  // working for java2js
+  if (m_delegate) {
+    bindBridge();
+    flush();
+  }
+
+  ReactMarker::logMarker("CREATE_REACT_CONTEXT_END");
+  ReactMarker::logMarker("RUN_JS_BUNDLE_END");
+}
+#endif
+
 void JSCExecutor::loadApplicationScript(std::unique_ptr<const JSBigString> script, std::string sourceURL) throw(JSException) {
   SystraceSection s("JSCExecutor::loadApplicationScript",
                     "sourceURL", sourceURL);
diff --git a/ReactCommon/cxxreact/JSCExecutor.h b/ReactCommon/cxxreact/JSCExecutor.h
index 7aaf944ce..fd1333f1d 100644
--- a/ReactCommon/cxxreact/JSCExecutor.h
+++ b/ReactCommon/cxxreact/JSCExecutor.h
@@ -63,38 +63,55 @@ public:
   virtual void loadApplicationScript(
     std::unique_ptr<const JSBigString> script,
     std::string sourceURL) throw(JSException) override;
+
 #ifdef WITH_FBJSCEXTENSIONS
   virtual void loadApplicationScript(
     std::string bundlePath,
     std::string sourceURL,
     int flags) override;
 #endif
+
+#ifdef WITH_FBJSCEXTENSIONS
+  virtual void loadApplicationScript(
+    int fd,
+    std::string sourceURL) override;
+#endif
+
   virtual void setJSModulesUnbundle(
     std::unique_ptr<JSModulesUnbundle> unbundle) override;
+
   virtual void callFunction(
     const std::string& moduleId,
     const std::string& methodId,
     const folly::dynamic& arguments) override;
+
   virtual void invokeCallback(
     const double callbackId,
     const folly::dynamic& arguments) override;
+
   template <typename T>
   Value callFunctionSync(
       const std::string& module, const std::string& method, T&& args) {
     return callFunctionSyncWithValue(module, method,
                                      toValue(m_context, std::forward<T>(args)));
   }
+
   virtual void setGlobalVariable(
     std::string propName,
     std::unique_ptr<const JSBigString> jsonValue) override;
+
   virtual void* getJavaScriptContext() override;
+
   virtual bool supportsProfiling() override;
   virtual void startProfiler(const std::string &titleString) override;
   virtual void stopProfiler(const std::string &titleString, const std::string &filename) override;
+
   virtual void handleMemoryPressureUiHidden() override;
   virtual void handleMemoryPressureModerate() override;
   virtual void handleMemoryPressureCritical() override;
+
   virtual void destroy() override;
+
   void setContextName(const std::string& name);
 
 private: