Remove dev-mode Hermes bytecode experiment

Summary: Changelog: [General][Removed] Remove experimental support for loading bytecode from Metro Removes the experimental bundling strategy that offloads Hermes bytecode compilation to the packager server. The React Native parts of this experiment were never part of the public API, and the Metro parts never fully shipped in open source. Followup from D43597007. Reviewed By: robhogan Differential Revision: D43604705 fbshipit-source-id: db3be553750ccbf286d876f75858299c5b750f19
facebook · Mar 21, 2023 · 6abc097 · 6abc097
1 parent 6dcdb93
commit 6abc097
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Showing 15 changed files with 10 additions and 107 deletions.
diff --git a/BUCK b/BUCK
@@ -12,7 +12,6 @@ load(
  "//tools/build_defs/oss:rn_defs.bzl",
  "ANDROID",
  "APPLE",
- "HERMES_BYTECODE_VERSION",
  "IOS",
  "RCT_IMAGE_DATA_DECODER_SOCKET",
  "RCT_IMAGE_URL_LOADER_SOCKET",
@@ -429,9 +428,7 @@ rn_apple_xplat_cxx_library(
  "linux",
  ["-D PIC_MODIFIER=@PLT"],
  )],
- preprocessor_flags = get_objc_arc_preprocessor_flags() + get_preprocessor_flags_for_build_mode() + [
- "-DHERMES_BYTECODE_VERSION={}".format(HERMES_BYTECODE_VERSION),
- ] + rn_extra_build_flags(),
+ preprocessor_flags = get_objc_arc_preprocessor_flags() + get_preprocessor_flags_for_build_mode() + rn_extra_build_flags(),
  visibility = [
  "//fbobjc/Apps/Internal/SparkLabs/...",
  "//fbobjc/Apps/Internal/Venice/...",

diff --git a/packages/react-native/React/Base/RCTBundleURLProvider.mm b/packages/react-native/React/Base/RCTBundleURLProvider.mm
@@ -265,19 +265,13 @@ + (NSURL *)jsBundleURLForBundleRoot:(NSString *)bundleRoot
  runModule:(BOOL)runModule
 {
  NSString *path = [NSString stringWithFormat:@"/%@.bundle", bundleRoot];
-#ifdef HERMES_BYTECODE_VERSION
- NSString *runtimeBytecodeVersion = [NSString stringWithFormat:@"&runtimeBytecodeVersion=%u", HERMES_BYTECODE_VERSION];
-#else
- NSString *runtimeBytecodeVersion = @"";
-#endif
 
  // When we support only iOS 8 and above, use queryItems for a better API.
- NSString *query = [NSString stringWithFormat:@"platform=ios&dev=%@&minify=%@&modulesOnly=%@&runModule=%@%@",
+ NSString *query = [NSString stringWithFormat:@"platform=ios&dev=%@&minify=%@&modulesOnly=%@&runModule=%@",
  enableDev ? @"true" : @"false",
  enableMinification ? @"true" : @"false",
  modulesOnly ? @"true" : @"false",
- runModule ? @"true" : @"false",
- runtimeBytecodeVersion];
+ runModule ? @"true" : @"false"];
 
  NSString *bundleID = [[NSBundle mainBundle] objectForInfoDictionaryKey:(NSString *)kCFBundleIdentifierKey];
  if (bundleID) {

diff --git a/packages/react-native/React/Base/RCTJavaScriptLoader.h b/packages/react-native/React/Base/RCTJavaScriptLoader.h
@@ -11,8 +11,6 @@
 
 extern NSString *const RCTJavaScriptLoaderErrorDomain;
 
-extern const uint32_t RCT_BYTECODE_ALIGNMENT;
-
 NS_ENUM(NSInteger){
  RCTJavaScriptLoaderErrorNoScriptURL = 1,
  RCTJavaScriptLoaderErrorFailedOpeningFile = 2,

diff --git a/packages/react-native/React/Base/RCTJavaScriptLoader.mm b/packages/react-native/React/Base/RCTJavaScriptLoader.mm
@@ -19,8 +19,6 @@
 
 NSString *const RCTJavaScriptLoaderErrorDomain = @"RCTJavaScriptLoaderErrorDomain";
 
-const uint32_t RCT_BYTECODE_ALIGNMENT = 4;
-
 @interface RCTSource () {
  @public
  NSURL *_url;
@@ -41,12 +39,7 @@ @implementation RCTSource
 
  RCTSource *source = [RCTSource new];
  source->_url = url;
- // Multipart responses may give us an unaligned view into the buffer. This ensures memory is aligned.
- if (parseTypeFromHeader(header) == ScriptTag::MetroHBCBundle && ((long)[data bytes] % RCT_BYTECODE_ALIGNMENT)) {
- source->_data = [[NSData alloc] initWithData:data];
- } else {
- source->_data = data;
- }
+ source->_data = data;
  source->_length = length;
  source->_filesChangedCount = RCTSourceFilesChangedCountNotBuiltByBundler;
  return source;
@@ -171,7 +164,6 @@ + (NSData *)attemptSynchronousLoadOfBundleAtURL:(NSURL *)scriptURL
 
  facebook::react::ScriptTag tag = facebook::react::parseTypeFromHeader(header);
  switch (tag) {
- case facebook::react::ScriptTag::MetroHBCBundle:
  case facebook::react::ScriptTag::RAMBundle:
  break;
 
@@ -285,8 +277,7 @@ static void attemptAsynchronousLoadOfBundleAtURL(
  // Validate that the packager actually returned javascript.
  NSString *contentType = headers[@"Content-Type"];
  NSString *mimeType = [[contentType componentsSeparatedByString:@";"] firstObject];
- if (![mimeType isEqualToString:@"application/javascript"] && ![mimeType isEqualToString:@"text/javascript"] &&
- ![mimeType isEqualToString:@"application/x-metro-bytecode-bundle"]) {
+ if (![mimeType isEqualToString:@"application/javascript"] && ![mimeType isEqualToString:@"text/javascript"]) {
  NSString *description;
  if ([mimeType isEqualToString:@"application/json"]) {
  NSError *parseError;

diff --git a/packages/react-native/React/CxxBridge/RCTCxxBridge.mm b/packages/react-native/React/CxxBridge/RCTCxxBridge.mm
@@ -1494,11 +1494,6 @@ - (void)executeApplicationScriptSync:(NSData *)script url:(NSURL *)url
  [self executeApplicationScript:script url:url async:NO];
 }
 
-static uint32_t RCTReadUInt32LE(NSData *script, uint32_t offset)
-{
- return [script length] < offset + 4 ? 0 : CFSwapInt32LittleToHost(*(((uint32_t *)[script bytes]) + offset / 4));
-}
-
 - (void)executeApplicationScript:(NSData *)script url:(NSURL *)url async:(BOOL)async
 {
  [self _tryAndHandleError:^{
@@ -1514,15 +1509,7 @@ - (void)executeApplicationScript:(NSData *)script url:(NSURL *)url async:(BOOL)a
  // hold a local reference to reactInstance in case a parallel thread
  // resets it between null check and usage
  auto reactInstance = self->_reactInstance;
- if (reactInstance && scriptType == ScriptTag::MetroHBCBundle) {
- uint32_t offset = 8;
- while (offset < script.length) {
- uint32_t fileLength = RCTReadUInt32LE(script, offset);
- NSData *unit = [script subdataWithRange:NSMakeRange(offset + 4, fileLength)];
- reactInstance->loadScriptFromString(std::make_unique<NSDataBigString>(unit), sourceUrlStr.UTF8String, false);
- offset += ((fileLength + RCT_BYTECODE_ALIGNMENT - 1) & ~(RCT_BYTECODE_ALIGNMENT - 1)) + 4;
- }
- } else if (scriptType == ScriptTag::RAMBundle) {
+ if (scriptType == ScriptTag::RAMBundle) {
  [self->_performanceLogger markStartForTag:RCTPLRAMBundleLoad];
  auto ramBundle = std::make_unique<JSIndexedRAMBundle>(sourceUrlStr.UTF8String);
  std::unique_ptr<const JSBigString> scriptStr = ramBundle->getStartupCode();

diff --git a/packages/react-native/ReactAndroid/build.gradle b/packages/react-native/ReactAndroid/build.gradle
@@ -454,7 +454,6 @@ android {
 
  buildConfigField("boolean", "IS_INTERNAL_BUILD", "false")
  buildConfigField("int", "EXOPACKAGE_FLAGS", "0")
- buildConfigField("int", "HERMES_BYTECODE_VERSION", "0")
 
  resValue "integer", "react_native_dev_server_port", reactNativeDevServerPort()
  resValue "integer", "react_native_inspector_proxy_port", reactNativeInspectorProxyPort()

diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/BUCK b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/common/BUCK
@@ -1,4 +1,4 @@
-load("//tools/build_defs/oss:rn_defs.bzl", "HERMES_BYTECODE_VERSION", "react_native_dep", "rn_android_build_config", "rn_android_library")
+load("//tools/build_defs/oss:rn_defs.bzl", "react_native_dep", "rn_android_build_config", "rn_android_library")
 
 SUB_PROJECTS = [
  "network/**/*",
@@ -40,7 +40,6 @@ rn_android_build_config(
  package = "com.facebook.react",
  values = [
  "boolean IS_INTERNAL_BUILD = true",
- "int HERMES_BYTECODE_VERSION = {}".format(HERMES_BYTECODE_VERSION),
  ],
  visibility = [
  "PUBLIC",

diff --git a/...t-native/ReactAndroid/src/main/java/com/facebook/react/common/build/ReactBuildConfig.java b/...t-native/ReactAndroid/src/main/java/com/facebook/react/common/build/ReactBuildConfig.java
@@ -20,5 +20,4 @@ public class ReactBuildConfig {
  public static final boolean DEBUG = BuildConfig.DEBUG;
  public static final boolean IS_INTERNAL_BUILD = BuildConfig.IS_INTERNAL_BUILD;
  public static final int EXOPACKAGE_FLAGS = BuildConfig.EXOPACKAGE_FLAGS;
- public static final int HERMES_BYTECODE_VERSION = BuildConfig.HERMES_BYTECODE_VERSION;
 }
diff --git a/...eact-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java b/...eact-native/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java
@@ -14,7 +14,6 @@
 import com.facebook.infer.annotation.Assertions;
 import com.facebook.react.bridge.ReactContext;
 import com.facebook.react.common.ReactConstants;
-import com.facebook.react.common.build.ReactBuildConfig;
 import com.facebook.react.devsupport.interfaces.DevBundleDownloadListener;
 import com.facebook.react.devsupport.interfaces.PackagerStatusCallback;
 import com.facebook.react.devsupport.interfaces.StackFrame;
@@ -427,22 +426,17 @@ private String createSplitBundleURL(String mainModuleID, String host) {
 
  private String createBundleURL(
  String mainModuleID, BundleType type, String host, boolean modulesOnly, boolean runModule) {
- String runtimeBytecodeVersion =
- ReactBuildConfig.HERMES_BYTECODE_VERSION != 0
- ? "&runtimeBytecodeVersion=" + ReactBuildConfig.HERMES_BYTECODE_VERSION
- : "";
  return String.format(
  Locale.US,
- "http://%s/%s.%s?platform=android&dev=%s&minify=%s&app=%s&modulesOnly=%s&runModule=%s%s",
+ "http://%s/%s.%s?platform=android&dev=%s&minify=%s&app=%s&modulesOnly=%s&runModule=%s",
  host,
  mainModuleID,
  type.typeID(),
  getDevMode(),
  getJSMinifyMode(),
  mPackageName,
  modulesOnly ? "true" : "false",
- runModule ? "true" : "false",
- runtimeBytecodeVersion);
+ runModule ? "true" : "false");
  }
 
  private String createBundleURL(String mainModuleID, BundleType type) {

diff --git a/packages/react-native/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.cpp b/packages/react-native/ReactAndroid/src/main/jni/react/jni/CatalystInstanceImpl.cpp
@@ -290,30 +290,6 @@ void CatalystInstanceImpl::jniLoadScriptFromFile(
  }
 
  switch (getScriptTagFromFile(fileName.c_str())) {
- case ScriptTag::MetroHBCBundle: {
- std::unique_ptr<const JSBigFileString> script;
- RecoverableError::runRethrowingAsRecoverable<std::system_error>(
- [&fileName, &script]() {
- script = JSBigFileString::fromPath(fileName);
- });
- const char *buffer = script->c_str();
- uint32_t bufferLength = (uint32_t)script->size();
- uint32_t offset = 8;
- while (offset < bufferLength) {
- uint32_t segment = offset + 4;
- uint32_t moduleLength =
- bufferLength < segment ? 0 : *(((uint32_t *)buffer) + offset / 4);
-
- reactInstance->loadScriptFromString(
- std::make_unique<const JSBigStdString>(
- std::string(buffer + segment, buffer + moduleLength + segment)),
- sourceURL,
- false);
-
- offset += ((moduleLength + 3) & ~3) + 4;
- }
- break;
- }
  case ScriptTag::RAMBundle:
  instance_->loadRAMBundleFromFile(fileName, sourceURL, loadSynchronously);
  break;

diff --git a/packages/react-native/ReactCommon/cxxreact/JSBundleType.cpp b/packages/react-native/ReactCommon/cxxreact/JSBundleType.cpp
@@ -11,7 +11,6 @@ namespace facebook {
 namespace react {
 
 static uint32_t constexpr RAMBundleMagicNumber = 0xFB0BD1E5;
-static uint32_t constexpr MetroHBCBundleMagicNumber = 0xFFE7C3C3;
 
 // "Hermes" in ancient Greek encoded in UTF-16BE and truncated to 8 bytes.
 static uint64_t constexpr HermesBCBundleMagicNumber = 0x1F1903C103BC1FC6;
@@ -20,8 +19,6 @@ ScriptTag parseTypeFromHeader(const BundleHeader &header) {
  switch (header.magic32.value) {
  case RAMBundleMagicNumber:
  return ScriptTag::RAMBundle;
- case MetroHBCBundleMagicNumber:
- return ScriptTag::MetroHBCBundle;
  default:
  return ScriptTag::String;
  }
@@ -33,8 +30,6 @@ const char *stringForScriptTag(const ScriptTag &tag) {
  return "String";
  case ScriptTag::RAMBundle:
  return "RAM Bundle";
- case ScriptTag::MetroHBCBundle:
- return "Metro Hermes Bytecode Bundle";
  }
  return "";
 }

diff --git a/packages/react-native/ReactCommon/cxxreact/JSBundleType.h b/packages/react-native/ReactCommon/cxxreact/JSBundleType.h
@@ -27,7 +27,6 @@ namespace react {
 enum struct ScriptTag {
  String = 0,
  RAMBundle,
- MetroHBCBundle,
 };
 
 /**

diff --git a/packages/rn-tester/BUCK b/packages/rn-tester/BUCK
@@ -1,5 +1,4 @@
 load("@fbsource//tools/build_defs:glob_defs.bzl", "subdir_glob")
-load("@fbsource//xplat/hermes/defs:hermes.bzl", "HERMES_BYTECODE_VERSION")
 load("//tools/build_defs:fb_native_wrapper.bzl", "fb_native")
 load("//tools/build_defs:fb_xplat_platform_specific_rule.bzl", "fb_xplat_platform_specific_rule")
 load("//tools/build_defs:fb_xplat_resource.bzl", "fb_xplat_resource")
@@ -138,9 +137,7 @@ fb_apple_test(
  "QuartzCore",
  "UIKit",
  ],
- preprocessor_flags = get_objc_arc_preprocessor_flags() + [
- "-DHERMES_BYTECODE_VERSION={}".format(HERMES_BYTECODE_VERSION),
- ] + get_preprocessor_flags_for_build_mode(),
+ preprocessor_flags = get_objc_arc_preprocessor_flags() + get_preprocessor_flags_for_build_mode(),
  visibility = [
  "//fbobjc/Libraries/FBReactKit:workspace",
  ],

diff --git a/packages/rn-tester/RNTesterUnitTests/RCTBundleURLProviderTests.m b/packages/rn-tester/RNTesterUnitTests/RCTBundleURLProviderTests.m
@@ -22,42 +22,22 @@
 
 static NSURL *localhostBundleURL()
 {
-#ifdef HERMES_BYTECODE_VERSION
- return [NSURL
- URLWithString:
- [NSString
- stringWithFormat:
- @"http://localhost:8081/%@.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&runtimeBytecodeVersion=%u&app=com.apple.dt.xctest.tool",
- testFile,
- HERMES_BYTECODE_VERSION]];
-#else
  return [NSURL
  URLWithString:
  [NSString
  stringWithFormat:
  @"http://localhost:8081/%@.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=com.apple.dt.xctest.tool",
  testFile]];
-#endif
 }
 
 static NSURL *ipBundleURL()
 {
-#ifdef HERMES_BYTECODE_VERSION
- return [NSURL
- URLWithString:
- [NSString
- stringWithFormat:
- @"http://192.168.1.1:8081/%@.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&runtimeBytecodeVersion=%u&app=com.apple.dt.xctest.tool",
- testFile,
- HERMES_BYTECODE_VERSION]];
-#else
  return [NSURL
  URLWithString:
  [NSString
  stringWithFormat:
  @"http://192.168.1.1:8081/%@.bundle?platform=ios&dev=true&minify=false&modulesOnly=false&runModule=true&app=com.apple.dt.xctest.tool",
  testFile]];
-#endif
 }
 
 @implementation NSBundle (RCTBundleURLProviderTests)

diff --git a/tools/build_defs/oss/rn_defs.bzl b/tools/build_defs/oss/rn_defs.bzl
@@ -428,8 +428,6 @@ def react_fabric_component_plugin_provider(name, native_class_func):
 def react_cxx_module_plugin_provider(name, function):
  return None
 
-HERMES_BYTECODE_VERSION = -1
-
 RCT_IMAGE_DATA_DECODER_SOCKET = None
 RCT_IMAGE_URL_LOADER_SOCKET = None
 RCT_URL_REQUEST_HANDLER_SOCKET = None