Add hermes and jsi (#52060)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/52060

Changelog: [Internal]

Add hermes and jsi so we can evaluate JS.

Reviewed By: christophpurrer

Differential Revision: D76746362

fbshipit-source-id: a5fbb90d06a8608154b6ae80242b969e7cb03cea

packages/react-native/ReactAndroid/hermes-engine/build.gradle.kts

@@ -186,6 +186,24 @@ val prepareHeadersForPrefab by
       into(prefabHeadersDir)
     }
 
+val buildHermesLib by
+    tasks.registering(CustomExecTask::class) {
+      dependsOn(buildHermesC)
+      workingDir(hermesDir)
+      inputs.files(hermesBuildOutputFileTree)
+      commandLine(
+          cmakeBinaryPath,
+          "--build",
+          hermesBuildDir.toString(),
+          "--target",
+          "libhermes",
+          "-j",
+          ndkBuildJobs,
+      )
+      standardOutputFile.set(project.file("$buildDir/build-hermes-lib.log"))
+      errorOutputFile.set(project.file("$buildDir/build-hermes-lib.error.log"))
+    }
+
 fun windowsAwareCommandLine(vararg commands: String): List<String> {
   val result =
       if (Os.isFamily(Os.FAMILY_WINDOWS)) {

private/react-native-fantom/build.gradle.kts

@@ -59,5 +59,7 @@ val prepareNative3pDependencies by
     tasks.registering {
       dependsOn(
           prepareGflags,
+          ":packages:react-native:ReactAndroid:hermes-engine:buildHermesLib",
+          ":packages:react-native:ReactAndroid:hermes-engine:prepareHeadersForPrefab",
       )
     }

private/react-native-fantom/tester/CMakeLists.txt

@@ -8,6 +8,11 @@ set(CMAKE_VERBOSE_MAKEFILE on)
 
 project(fantom_tester)
 
+find_library(LIB_HERMES libhermes
+  HINTS ${REACT_ANDROID_DIR}/hermes-engine/build/hermes/API/hermes
+  REQUIRED)
+include_directories(${REACT_ANDROID_DIR}/hermes-engine/build/prefab-headers)
+
 include(${REACT_COMMON_DIR}/cmake-utils/react-native-flags.cmake)
 
 # Convert input paths to CMake format (with forward slashes)
@@ -23,7 +28,7 @@ function(add_third_party_subdir relative_path)
 endfunction()
 
 function(add_react_common_subdir relative_path)
-  add_subdirectory(${REACT_COMMON_DIR}/${relative_path} src/${relative_path})
+  add_subdirectory(${REACT_COMMON_DIR}/${relative_path} ReactCommon/${relative_path})
 endfunction()
 
 function(add_fantom_third_party_subdir relative_path)
@@ -42,6 +47,7 @@ add_fantom_third_party_subdir(gflags)
 
 # Common targets
 add_react_common_subdir(yoga)
+add_react_common_subdir(jsi)
 add_react_common_subdir(react/featureflags)
 
 file(GLOB SOURCES "src/*.cpp" "src/*.h")
@@ -51,6 +57,8 @@ target_link_libraries(fantom_tester
   PRIVATE
     glog
     gflags
+    jsi
+    ${LIB_HERMES}
     boost
     double-conversion
     fast_float

private/react-native-fantom/tester/build.sh

@@ -11,6 +11,7 @@ BUILD_DIR="$SCRIPT_DIR/build"
 REACT_NATIVE_ROOT_DIR=$(readlink -f "$SCRIPT_DIR/../../../packages/react-native")
 
 cmake -S "$SCRIPT_DIR" -B "$BUILD_DIR" \
+ -DREACT_ANDROID_DIR="${REACT_NATIVE_ROOT_DIR}/ReactAndroid" \
  -DFANTOM_THIRD_PARTY_DIR="${SCRIPT_DIR}/../build/third-party" \
  -DREACT_THIRD_PARTY_NDK_DIR="${REACT_NATIVE_ROOT_DIR}/ReactAndroid/build/third-party-ndk" \
  -DREACT_COMMON_DIR="${REACT_NATIVE_ROOT_DIR}/ReactCommon"

private/react-native-fantom/tester/src/main.cpp

@@ -8,6 +8,8 @@
 #include <folly/json.h>
 #include <gflags/gflags.h>
 #include <glog/logging.h>
+#include <hermes/hermes.h>
+#include <jsi/jsi.h>
 #include <react/featureflags/ReactNativeFeatureFlags.h>
 #include <react/featureflags/ReactNativeFeatureFlagsDynamicProvider.h>
 #include <yoga/YGEnums.h>
@@ -23,6 +25,8 @@ DEFINE_string(
     "JSON representation of the common feature flags to set for the app");
 
 using namespace facebook::react;
+using namespace facebook::hermes;
+using namespace facebook::jsi;
 
 static void setUpLogging() {
   google::InitGoogleLogging("react-native-fantom");
@@ -46,6 +50,31 @@ static folly::dynamic setUpFeatureFlags() {
   return dynamicFeatureFlags;
 }
 
+void createHermesInstance() {
+  auto gcConfig = ::hermes::vm::GCConfig::Builder()
+                      // Default to 3GB
+                      .withMaxHeapSize(3072 << 20)
+                      .withName("RNBridgeless");
+  ::hermes::vm::RuntimeConfig::Builder runtimeConfigBuilder =
+      ::hermes::vm::RuntimeConfig::Builder()
+          .withGCConfig(gcConfig.build())
+          .withEnableSampleProfiling(true);
+
+  std::unique_ptr<HermesRuntime> hermesRuntime =
+      makeHermesRuntime(runtimeConfigBuilder.build());
+
+  hermesRuntime->evaluateJavaScript(
+      std::make_unique<StringBuffer>(
+          "var fantom = 'Hello, I am fantom_tester'"),
+      "script.js");
+
+  LOG(INFO) << "JS evaluated value: "
+            << hermesRuntime->global()
+                   .getProperty(*hermesRuntime, "fantom")
+                   .getString(*hermesRuntime)
+                   .utf8(*hermesRuntime);
+}
+
 int main(int argc, char* argv[]) {
   if (argc > 0 && argv != nullptr) {
     // Don't exit app on unknown flags, as some of those may be provided when
@@ -64,5 +93,7 @@ int main(int argc, char* argv[]) {
   LOG(INFO) << fmt::format(
       "[FeatureFlags] overrides: {}", folly::toJson(dynamicFeatureFlags));
 
+  createHermesInstance();
+
   return 0;
 }