deps: V8: backport 844fe8f7d965

Original commit message:

    Make StringBuffer::string return a StringView instead of a reference.

    A StringView is pretty light, so this should be similar to
    how absl::string_view is typically used, e.g. see the guidance here:
    https://github.com/abseil/abseil-cpp/blob/master/absl/strings/string_view.h
    I suspect this reasoning holds even though StringView (defined
    just above StringBuffer in v8-inspector.h) carries an additional bool.
    This yields a small simplification of the StringBuffer implementations.

    Change-Id: I03f850049afe2327913070838f39649fcdfa6fa8
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2045110
    Commit-Queue: Yang Guo <yangguo@chromium.org>
    Reviewed-by: Yang Guo <yangguo@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#66858}

(Neighbouring-line conflicts were resolved while backporting.)

Refs: v8/v8@844fe8f

PR-URL: #32885
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Ujjwal Sharma <ryzokuken@disroot.org>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>

Author: addaleax

common.gypi

@@ -35,7 +35,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.14',
+    'v8_embedder_string': '-node.15',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/include/v8-inspector.h

@@ -65,15 +65,15 @@ class V8_EXPORT StringView {
 class V8_EXPORT StringBuffer {
  public:
   virtual ~StringBuffer() = default;
-  virtual const StringView& string() = 0;
+  virtual StringView string() const = 0;
   // This method copies contents.
-  static std::unique_ptr<StringBuffer> create(const StringView&);
+  static std::unique_ptr<StringBuffer> create(StringView);
 };
 
 class V8_EXPORT V8ContextInfo {
  public:
   V8ContextInfo(v8::Local<v8::Context> context, int contextGroupId,
-                const StringView& humanReadableName)
+                StringView humanReadableName)
       : context(context),
         contextGroupId(contextGroupId),
         humanReadableName(humanReadableName),
@@ -132,37 +132,36 @@ class V8_EXPORT V8InspectorSession {
   virtual void addInspectedObject(std::unique_ptr<Inspectable>) = 0;
 
   // Dispatching protocol messages.
-  static bool canDispatchMethod(const StringView& method);
-  virtual void dispatchProtocolMessage(const StringView& message) = 0;
+  static bool canDispatchMethod(StringView method);
+  virtual void dispatchProtocolMessage(StringView message) = 0;
   virtual std::vector<uint8_t> state() = 0;
   virtual std::vector<std::unique_ptr<protocol::Schema::API::Domain>>
   supportedDomains() = 0;
 
   // Debugger actions.
-  virtual void schedulePauseOnNextStatement(const StringView& breakReason,
-                                            const StringView& breakDetails) = 0;
+  virtual void schedulePauseOnNextStatement(StringView breakReason,
+                                            StringView breakDetails) = 0;
   virtual void cancelPauseOnNextStatement() = 0;
-  virtual void breakProgram(const StringView& breakReason,
-                            const StringView& breakDetails) = 0;
+  virtual void breakProgram(StringView breakReason,
+                            StringView breakDetails) = 0;
   virtual void setSkipAllPauses(bool) = 0;
   virtual void resume() = 0;
   virtual void stepOver() = 0;
   virtual std::vector<std::unique_ptr<protocol::Debugger::API::SearchMatch>>
-  searchInTextByLines(const StringView& text, const StringView& query,
-                      bool caseSensitive, bool isRegex) = 0;
+  searchInTextByLines(StringView text, StringView query, bool caseSensitive,
+                      bool isRegex) = 0;
 
   // Remote objects.
   virtual std::unique_ptr<protocol::Runtime::API::RemoteObject> wrapObject(
-      v8::Local<v8::Context>, v8::Local<v8::Value>, const StringView& groupName,
+      v8::Local<v8::Context>, v8::Local<v8::Value>, StringView groupName,
       bool generatePreview) = 0;
 
   virtual bool unwrapObject(std::unique_ptr<StringBuffer>* error,
-                            const StringView& objectId, v8::Local<v8::Value>*,
+                            StringView objectId, v8::Local<v8::Value>*,
                             v8::Local<v8::Context>*,
                             std::unique_ptr<StringBuffer>* objectGroup) = 0;
-  virtual void releaseObjectGroup(const StringView&) = 0;
-  virtual void triggerPreciseCoverageDeltaUpdate(
-      const StringView& occassion) = 0;
+  virtual void releaseObjectGroup(StringView) = 0;
+  virtual void triggerPreciseCoverageDeltaUpdate(StringView occassion) = 0;
 };
 
 class V8_EXPORT V8InspectorClient {
@@ -240,7 +239,7 @@ struct V8_EXPORT V8StackTraceId {
   V8StackTraceId(uintptr_t id, const std::pair<int64_t, int64_t> debugger_id);
   V8StackTraceId(uintptr_t id, const std::pair<int64_t, int64_t> debugger_id,
                  bool should_pause);
-  explicit V8StackTraceId(const StringView&);
+  explicit V8StackTraceId(StringView);
   V8StackTraceId& operator=(const V8StackTraceId&) = default;
   V8StackTraceId& operator=(V8StackTraceId&&) noexcept = default;
   ~V8StackTraceId() = default;
@@ -265,26 +264,26 @@ class V8_EXPORT V8Inspector {
   virtual void idleFinished() = 0;
 
   // Async stack traces instrumentation.
-  virtual void asyncTaskScheduled(const StringView& taskName, void* task,
+  virtual void asyncTaskScheduled(StringView taskName, void* task,
                                   bool recurring) = 0;
   virtual void asyncTaskCanceled(void* task) = 0;
   virtual void asyncTaskStarted(void* task) = 0;
   virtual void asyncTaskFinished(void* task) = 0;
   virtual void allAsyncTasksCanceled() = 0;
 
-  virtual V8StackTraceId storeCurrentStackTrace(
-      const StringView& description) = 0;
+  virtual V8StackTraceId storeCurrentStackTrace(StringView description) = 0;
   virtual void externalAsyncTaskStarted(const V8StackTraceId& parent) = 0;
   virtual void externalAsyncTaskFinished(const V8StackTraceId& parent) = 0;
 
   // Exceptions instrumentation.
-  virtual unsigned exceptionThrown(
-      v8::Local<v8::Context>, const StringView& message,
-      v8::Local<v8::Value> exception, const StringView& detailedMessage,
-      const StringView& url, unsigned lineNumber, unsigned columnNumber,
-      std::unique_ptr<V8StackTrace>, int scriptId) = 0;
+  virtual unsigned exceptionThrown(v8::Local<v8::Context>, StringView message,
+                                   v8::Local<v8::Value> exception,
+                                   StringView detailedMessage, StringView url,
+                                   unsigned lineNumber, unsigned columnNumber,
+                                   std::unique_ptr<V8StackTrace>,
+                                   int scriptId) = 0;
   virtual void exceptionRevoked(v8::Local<v8::Context>, unsigned exceptionId,
-                                const StringView& message) = 0;
+                                StringView message) = 0;
 
   // Connection.
   class V8_EXPORT Channel {
@@ -295,8 +294,9 @@ class V8_EXPORT V8Inspector {
     virtual void sendNotification(std::unique_ptr<StringBuffer> message) = 0;
     virtual void flushProtocolNotifications() = 0;
   };
-  virtual std::unique_ptr<V8InspectorSession> connect(
-      int contextGroupId, Channel*, const StringView& state) = 0;
+  virtual std::unique_ptr<V8InspectorSession> connect(int contextGroupId,
+                                                      Channel*,
+                                                      StringView state) = 0;
 
   // API methods.
   virtual std::unique_ptr<V8StackTrace> createStackTrace(

deps/v8/src/inspector/string-util.cc

@@ -129,41 +129,38 @@ namespace {
 // default-constructed StringView instance.
 class EmptyStringBuffer : public StringBuffer {
  public:
-  const StringView& string() override { return string_; }
-
- private:
-  StringView string_;
+  StringView string() const override { return StringView(); }
 };
 
 // Contains LATIN1 text data or CBOR encoded binary data in a vector.
 class StringBuffer8 : public StringBuffer {
  public:
-  explicit StringBuffer8(std::vector<uint8_t> data)
-      : data_(std::move(data)), string_(data_.data(), data_.size()) {}
+  explicit StringBuffer8(std::vector<uint8_t> data) : data_(std::move(data)) {}
 
-  const StringView& string() override { return string_; }
+  StringView string() const override {
+    return StringView(data_.data(), data_.size());
+  }
 
  private:
   std::vector<uint8_t> data_;
-  StringView string_;
 };
 
 // Contains a 16 bit string (String16).
 class StringBuffer16 : public StringBuffer {
  public:
-  explicit StringBuffer16(String16 data)
-      : data_(std::move(data)), string_(data_.characters16(), data_.length()) {}
+  explicit StringBuffer16(String16 data) : data_(std::move(data)) {}
 
-  const StringView& string() override { return string_; }
+  StringView string() const override {
+    return StringView(data_.characters16(), data_.length());
+  }
 
  private:
   String16 data_;
-  StringView string_;
 };
 }  // namespace
 
 // static
-std::unique_ptr<StringBuffer> StringBuffer::create(const StringView& string) {
+std::unique_ptr<StringBuffer> StringBuffer::create(StringView string) {
   if (string.length() == 0) return std::make_unique<EmptyStringBuffer>();
   if (string.is8Bit()) {
     return std::make_unique<StringBuffer8>(std::vector<uint8_t>(

deps/v8/src/inspector/v8-inspector-impl.cc

@@ -155,8 +155,7 @@ std::unique_ptr<V8StackTrace> V8InspectorImpl::createStackTrace(
 }
 
 std::unique_ptr<V8InspectorSession> V8InspectorImpl::connect(
-    int contextGroupId, V8Inspector::Channel* channel,
-    const StringView& state) {
+    int contextGroupId, V8Inspector::Channel* channel, StringView state) {
   int sessionId = ++m_lastSessionId;
   std::unique_ptr<V8InspectorSessionImpl> session =
       V8InspectorSessionImpl::create(this, contextGroupId, sessionId, channel,
@@ -256,9 +255,9 @@ void V8InspectorImpl::idleStarted() { m_isolate->SetIdle(true); }
 void V8InspectorImpl::idleFinished() { m_isolate->SetIdle(false); }
 
 unsigned V8InspectorImpl::exceptionThrown(
-    v8::Local<v8::Context> context, const StringView& message,
-    v8::Local<v8::Value> exception, const StringView& detailedMessage,
-    const StringView& url, unsigned lineNumber, unsigned columnNumber,
+    v8::Local<v8::Context> context, StringView message,
+    v8::Local<v8::Value> exception, StringView detailedMessage, StringView url,
+    unsigned lineNumber, unsigned columnNumber,
     std::unique_ptr<V8StackTrace> stackTrace, int scriptId) {
   int groupId = contextGroupId(context);
   if (!groupId || m_muteExceptionsMap[groupId]) return 0;
@@ -277,7 +276,7 @@ unsigned V8InspectorImpl::exceptionThrown(
 
 void V8InspectorImpl::exceptionRevoked(v8::Local<v8::Context> context,
                                        unsigned exceptionId,
-                                       const StringView& message) {
+                                       StringView message) {
   int groupId = contextGroupId(context);
   if (!groupId) return;
 
@@ -292,8 +291,7 @@ std::unique_ptr<V8StackTrace> V8InspectorImpl::captureStackTrace(
   return m_debugger->captureStackTrace(fullStack);
 }
 
-V8StackTraceId V8InspectorImpl::storeCurrentStackTrace(
-    const StringView& description) {
+V8StackTraceId V8InspectorImpl::storeCurrentStackTrace(StringView description) {
   return m_debugger->storeCurrentStackTrace(description);
 }
 
@@ -305,7 +303,7 @@ void V8InspectorImpl::externalAsyncTaskFinished(const V8StackTraceId& parent) {
   m_debugger->externalAsyncTaskFinished(parent);
 }
 
-void V8InspectorImpl::asyncTaskScheduled(const StringView& taskName, void* task,
+void V8InspectorImpl::asyncTaskScheduled(StringView taskName, void* task,
                                          bool recurring) {
   if (!task) return;
   m_debugger->asyncTaskScheduled(taskName, task, recurring);

deps/v8/src/inspector/v8-inspector-impl.h

@@ -77,33 +77,33 @@ class V8InspectorImpl : public V8Inspector {
   // V8Inspector implementation.
   std::unique_ptr<V8InspectorSession> connect(int contextGroupId,
                                               V8Inspector::Channel*,
-                                              const StringView& state) override;
+                                              StringView state) override;
   void contextCreated(const V8ContextInfo&) override;
   void contextDestroyed(v8::Local<v8::Context>) override;
   v8::MaybeLocal<v8::Context> contextById(int contextId) override;
   void contextCollected(int contextGroupId, int contextId);
   void resetContextGroup(int contextGroupId) override;
   void idleStarted() override;
   void idleFinished() override;
-  unsigned exceptionThrown(v8::Local<v8::Context>, const StringView& message,
+  unsigned exceptionThrown(v8::Local<v8::Context>, StringView message,
                            v8::Local<v8::Value> exception,
-                           const StringView& detailedMessage,
-                           const StringView& url, unsigned lineNumber,
-                           unsigned columnNumber, std::unique_ptr<V8StackTrace>,
+                           StringView detailedMessage, StringView url,
+                           unsigned lineNumber, unsigned columnNumber,
+                           std::unique_ptr<V8StackTrace>,
                            int scriptId) override;
   void exceptionRevoked(v8::Local<v8::Context>, unsigned exceptionId,
-                        const StringView& message) override;
+                        StringView message) override;
   std::unique_ptr<V8StackTrace> createStackTrace(
       v8::Local<v8::StackTrace>) override;
   std::unique_ptr<V8StackTrace> captureStackTrace(bool fullStack) override;
-  void asyncTaskScheduled(const StringView& taskName, void* task,
+  void asyncTaskScheduled(StringView taskName, void* task,
                           bool recurring) override;
   void asyncTaskCanceled(void* task) override;
   void asyncTaskStarted(void* task) override;
   void asyncTaskFinished(void* task) override;
   void allAsyncTasksCanceled() override;
 
-  V8StackTraceId storeCurrentStackTrace(const StringView& description) override;
+  V8StackTraceId storeCurrentStackTrace(StringView description) override;
   void externalAsyncTaskStarted(const V8StackTraceId& parent) override;
   void externalAsyncTaskFinished(const V8StackTraceId& parent) override;