[include] Split out v8.h

This moves every single class/function out of include/v8.h into a
separate header in include/, which v8.h then includes so that
externally nothing appears to have changed.

Every include of v8.h from inside v8 has been changed to a more
fine-grained include.

Previously inline functions defined at the bottom of v8.h would call
private non-inline functions in the V8 class. Since that class is now
in v8-initialization.h and is rarely included (as that would create
dependency cycles), this is not possible and so those methods have been
moved out of the V8 class into the namespace v8::api_internal.

None of the previous files in include/ now #include v8.h, which means
if embedders were relying on this transitive dependency then it will
give compile failures.

v8-inspector.h does depend on v8-scripts.h for the time being to ensure
that Chrome continue to compile but that change will be reverted once
those transitive #includes in chrome are changed to include it directly.

Full design:
https://docs.google.com/document/d/1rTD--I8hCAr-Rho1WTumZzFKaDpEp0IJ8ejZtk4nJdA/edit?usp=sharing

Bug: v8:11965
Change-Id: I53b84b29581632710edc80eb11f819c2097a2877
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3097448Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76424}

BUILD.bazel

@@ -400,11 +400,52 @@ filegroup(
     srcs = [
         ":cppgc_headers_files",
         ":v8_version_files",
+        "include/v8-array-buffer.h",
+        "include/v8-callbacks.h",
+        "include/v8-container.h",
+        "include/v8-context.h",
         "include/v8-cppgc.h",
+        "include/v8-data.h",
+        "include/v8-date.h",
+        "include/v8-debug.h",
+        "include/v8-embedder-heap.h",
+        "include/v8-exception.h",
+        "include/v8-extension.h",
+        "include/v8-external.h",
         "include/v8-fast-api-calls.h",
+        "include/v8-forward.h",
+        "include/v8-function.h",
+        "include/v8-function-callback.h",
         "include/v8-internal.h",
+        "include/v8-isolate.h",
+        "include/v8-json.h",
+        "include/v8-local-handle.h",
+        "include/v8-locker.h",
+        "include/v8-maybe.h",
+        "include/v8-memory-span.h",
+        "include/v8-message.h",
+        "include/v8-microtask-queue.h",
+        "include/v8-microtask.h",
+        "include/v8-object.h",
+        "include/v8-persistent-handle.h",
+        "include/v8-primitive-object.h",
+        "include/v8-primitive.h",
         "include/v8-profiler.h",
+        "include/v8-promise.h",
+        "include/v8-proxy.h",
+        "include/v8-regexp.h",
+        "include/v8-script.h",
+        "include/v8-snapshot.h",
+        "include/v8-statistics.h",
+        "include/v8-template.h",
+        "include/v8-traced-handle.h",
+        "include/v8-typed-array.h",
+        "include/v8-unwinder.h",
         "include/v8-util.h",
+        "include/v8-value-serializer.h",
+        "include/v8-value.h",
+        "include/v8-wasm.h",
+        "include/v8-weak-callback-info.h",
         "include/v8.h",
     ],
 )

BUILD.gn

@@ -2312,11 +2312,53 @@ v8_header_set("v8_headers") {
   public_configs = [ ":headers_config" ]
 
   sources = [
+    "include/v8-array-buffer.h",
+    "include/v8-callbacks.h",
+    "include/v8-container.h",
+    "include/v8-context.h",
     "include/v8-cppgc.h",
+    "include/v8-data.h",
+    "include/v8-date.h",
+    "include/v8-debug.h",
+    "include/v8-embedder-heap.h",
+    "include/v8-exception.h",
+    "include/v8-extension.h",
+    "include/v8-external.h",
     "include/v8-fast-api-calls.h",
+    "include/v8-forward.h",
+    "include/v8-function-callback.h",
+    "include/v8-function.h",
+    "include/v8-initialization.h",
     "include/v8-internal.h",
+    "include/v8-isolate.h",
+    "include/v8-json.h",
+    "include/v8-local-handle.h",
+    "include/v8-locker.h",
+    "include/v8-maybe.h",
+    "include/v8-memory-span.h",
+    "include/v8-message.h",
+    "include/v8-microtask-queue.h",
+    "include/v8-microtask.h",
+    "include/v8-object.h",
+    "include/v8-persistent-handle.h",
+    "include/v8-primitive-object.h",
+    "include/v8-primitive.h",
     "include/v8-profiler.h",
+    "include/v8-promise.h",
+    "include/v8-proxy.h",
+    "include/v8-regexp.h",
+    "include/v8-script.h",
+    "include/v8-snapshot.h",
+    "include/v8-statistics.h",
+    "include/v8-template.h",
+    "include/v8-traced-handle.h",
+    "include/v8-typed-array.h",
+    "include/v8-unwinder.h",
     "include/v8-util.h",
+    "include/v8-value-serializer.h",
+    "include/v8-value.h",
+    "include/v8-wasm.h",
+    "include/v8-weak-callback-info.h",
     "include/v8.h",
   ]
 
@@ -5323,10 +5365,12 @@ if (v8_check_header_includes) {
       ":torque_ls_base",
       ":v8_base_without_compiler",
       ":v8_bigint",
+      ":v8_headers",
       ":v8_initializers",
       ":v8_internal_headers",
       ":v8_libbase",
       ":v8_maybe_icu",
+      ":v8_version",
       ":wee8",
       "src/inspector:inspector",
       "src/inspector:inspector_string_conversions",

include/v8-container.h

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_V8_CONTAINER_H_
+#define INCLUDE_V8_CONTAINER_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "v8-local-handle.h"  // NOLINT(build/include_directory)
+#include "v8-object.h"        // NOLINT(build/include_directory)
+#include "v8config.h"         // NOLINT(build/include_directory)
+
+namespace v8 {
+
+class Context;
+class Isolate;
+
+/**
+ * An instance of the built-in array constructor (ECMA-262, 15.4.2).
+ */
+class V8_EXPORT Array : public Object {
+ public:
+  uint32_t Length() const;
+
+  /**
+   * Creates a JavaScript array with the given length. If the length
+   * is negative the returned array will have length 0.
+   */
+  static Local<Array> New(Isolate* isolate, int length = 0);
+
+  /**
+   * Creates a JavaScript array out of a Local<Value> array in C++
+   * with a known length.
+   */
+  static Local<Array> New(Isolate* isolate, Local<Value>* elements,
+                          size_t length);
+  V8_INLINE static Array* Cast(Value* value) {
+#ifdef V8_ENABLE_CHECKS
+    CheckCast(value);
+#endif
+    return static_cast<Array*>(value);
+  }
+
+ private:
+  Array();
+  static void CheckCast(Value* obj);
+};
+
+/**
+ * An instance of the built-in Map constructor (ECMA-262, 6th Edition, 23.1.1).
+ */
+class V8_EXPORT Map : public Object {
+ public:
+  size_t Size() const;
+  void Clear();
+  V8_WARN_UNUSED_RESULT MaybeLocal<Value> Get(Local<Context> context,
+                                              Local<Value> key);
+  V8_WARN_UNUSED_RESULT MaybeLocal<Map> Set(Local<Context> context,
+                                            Local<Value> key,
+                                            Local<Value> value);
+  V8_WARN_UNUSED_RESULT Maybe<bool> Has(Local<Context> context,
+                                        Local<Value> key);
+  V8_WARN_UNUSED_RESULT Maybe<bool> Delete(Local<Context> context,
+                                           Local<Value> key);
+
+  /**
+   * Returns an array of length Size() * 2, where index N is the Nth key and
+   * index N + 1 is the Nth value.
+   */
+  Local<Array> AsArray() const;
+
+  /**
+   * Creates a new empty Map.
+   */
+  static Local<Map> New(Isolate* isolate);
+
+  V8_INLINE static Map* Cast(Value* value) {
+#ifdef V8_ENABLE_CHECKS
+    CheckCast(value);
+#endif
+    return static_cast<Map*>(value);
+  }
+
+ private:
+  Map();
+  static void CheckCast(Value* obj);
+};
+
+/**
+ * An instance of the built-in Set constructor (ECMA-262, 6th Edition, 23.2.1).
+ */
+class V8_EXPORT Set : public Object {
+ public:
+  size_t Size() const;
+  void Clear();
+  V8_WARN_UNUSED_RESULT MaybeLocal<Set> Add(Local<Context> context,
+                                            Local<Value> key);
+  V8_WARN_UNUSED_RESULT Maybe<bool> Has(Local<Context> context,
+                                        Local<Value> key);
+  V8_WARN_UNUSED_RESULT Maybe<bool> Delete(Local<Context> context,
+                                           Local<Value> key);
+
+  /**
+   * Returns an array of the keys in this Set.
+   */
+  Local<Array> AsArray() const;
+
+  /**
+   * Creates a new empty Set.
+   */
+  static Local<Set> New(Isolate* isolate);
+
+  V8_INLINE static Set* Cast(Value* value) {
+#ifdef V8_ENABLE_CHECKS
+    CheckCast(value);
+#endif
+    return static_cast<Set*>(value);
+  }
+
+ private:
+  Set();
+  static void CheckCast(Value* obj);
+};
+
+}  // namespace v8
+
+#endif  // INCLUDE_V8_CONTAINER_H_

include/v8-cppgc.h

@@ -14,8 +14,9 @@
 #include "cppgc/heap-statistics.h"
 #include "cppgc/internal/write-barrier.h"
 #include "cppgc/visitor.h"
-#include "v8-internal.h"  // NOLINT(build/include_directory)
-#include "v8.h"           // NOLINT(build/include_directory)
+#include "v8-internal.h"       // NOLINT(build/include_directory)
+#include "v8-platform.h"       // NOLINT(build/include_directory)
+#include "v8-traced-handle.h"  // NOLINT(build/include_directory)
 
 namespace cppgc {
 class AllocationHandle;
@@ -24,6 +25,8 @@ class HeapHandle;
 
 namespace v8 {
 
+class Object;
+
 namespace internal {
 class CppHeap;
 }  // namespace internal

include/v8-data.h

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_V8_DATA_H_
+#define INCLUDE_V8_DATA_H_
+
+#include "v8-local-handle.h"  // NOLINT(build/include_directory)
+#include "v8config.h"         // NOLINT(build/include_directory)
+
+namespace v8 {
+
+class Context;
+
+/**
+ * The superclass of objects that can reside on V8's heap.
+ */
+class V8_EXPORT Data {
+ public:
+  /**
+   * Returns true if this data is a |v8::Value|.
+   */
+  bool IsValue() const;
+
+  /**
+   * Returns true if this data is a |v8::Module|.
+   */
+  bool IsModule() const;
+
+  /**
+   * Returns true if this data is a |v8::Private|.
+   */
+  bool IsPrivate() const;
+
+  /**
+   * Returns true if this data is a |v8::ObjectTemplate|.
+   */
+  bool IsObjectTemplate() const;
+
+  /**
+   * Returns true if this data is a |v8::FunctionTemplate|.
+   */
+  bool IsFunctionTemplate() const;
+
+  /**
+   * Returns true if this data is a |v8::Context|.
+   */
+  bool IsContext() const;
+
+ private:
+  Data();
+};
+
+/**
+ * A fixed-sized array with elements of type Data.
+ */
+class V8_EXPORT FixedArray : public Data {
+ public:
+  int Length() const;
+  Local<Data> Get(Local<Context> context, int i) const;
+};
+
+}  // namespace v8
+
+#endif  // INCLUDE_V8_DATA_H_

include/v8-date.h

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_V8_DATE_H_
+#define INCLUDE_V8_DATE_H_
+
+#include "v8-local-handle.h"  // NOLINT(build/include_directory)
+#include "v8-object.h"        // NOLINT(build/include_directory)
+#include "v8config.h"         // NOLINT(build/include_directory)
+
+namespace v8 {
+
+class Context;
+
+/**
+ * An instance of the built-in Date constructor (ECMA-262, 15.9).
+ */
+class V8_EXPORT Date : public Object {
+ public:
+  static V8_WARN_UNUSED_RESULT MaybeLocal<Value> New(Local<Context> context,
+                                                     double time);
+
+  /**
+   * A specialization of Value::NumberValue that is more efficient
+   * because we know the structure of this object.
+   */
+  double ValueOf() const;
+
+  V8_INLINE static Date* Cast(Value* value) {
+#ifdef V8_ENABLE_CHECKS
+    CheckCast(value);
+#endif
+    return static_cast<Date*>(value);
+  }
+
+ private:
+  static void CheckCast(Value* obj);
+};
+
+}  // namespace v8
+
+#endif  // INCLUDE_V8_DATE_H_

include/v8-debug.h

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_V8_DEBUG_H_
+#define INCLUDE_V8_DEBUG_H_
+
+#include <stdint.h>
+
+#include "v8-local-handle.h"  // NOLINT(build/include_directory)
+#include "v8config.h"         // NOLINT(build/include_directory)
+
+namespace v8 {
+
+class Isolate;
+class String;
+
+/**
+ * A single JavaScript stack frame.
+ */
+class V8_EXPORT StackFrame {
+ public:
+  /**
+   * Returns the number, 1-based, of the line for the associate function call.
+   * This method will return Message::kNoLineNumberInfo if it is unable to
+   * retrieve the line number, or if kLineNumber was not passed as an option
+   * when capturing the StackTrace.
+   */
+  int GetLineNumber() const;
+
+  /**
+   * Returns the 1-based column offset on the line for the associated function
+   * call.
+   * This method will return Message::kNoColumnInfo if it is unable to retrieve
+   * the column number, or if kColumnOffset was not passed as an option when
+   * capturing the StackTrace.
+   */
+  int GetColumn() const;
+
+  /**
+   * Returns the id of the script for the function for this StackFrame.
+   * This method will return Message::kNoScriptIdInfo if it is unable to
+   * retrieve the script id, or if kScriptId was not passed as an option when
+   * capturing the StackTrace.
+   */
+  int GetScriptId() const;
+
+  /**
+   * Returns the name of the resource that contains the script for the
+   * function for this StackFrame.
+   */
+  Local<String> GetScriptName() const;
+
+  /**
+   * Returns the name of the resource that contains the script for the
+   * function for this StackFrame or sourceURL value if the script name
+   * is undefined and its source ends with //# sourceURL=... string or
+   * deprecated //@ sourceURL=... string.
+   */
+  Local<String> GetScriptNameOrSourceURL() const;
+
+  /**
+   * Returns the source of the script for the function for this StackFrame.
+   */
+  Local<String> GetScriptSource() const;
+
+  /**
+   * Returns the source mapping URL (if one is present) of the script for
+   * the function for this StackFrame.
+   */
+  Local<String> GetScriptSourceMappingURL() const;
+
+  /**
+   * Returns the name of the function associated with this stack frame.
+   */
+  Local<String> GetFunctionName() const;
+
+  /**
+   * Returns whether or not the associated function is compiled via a call to
+   * eval().
+   */
+  bool IsEval() const;
+
+  /**
+   * Returns whether or not the associated function is called as a
+   * constructor via "new".
+   */
+  bool IsConstructor() const;
+
+  /**
+   * Returns whether or not the associated functions is defined in wasm.
+   */
+  bool IsWasm() const;
+
+  /**
+   * Returns whether or not the associated function is defined by the user.
+   */
+  bool IsUserJavaScript() const;
+};
+
+/**
+ * Representation of a JavaScript stack trace. The information collected is a
+ * snapshot of the execution stack and the information remains valid after
+ * execution continues.
+ */
+class V8_EXPORT StackTrace {
+ public:
+  /**
+   * Flags that determine what information is placed captured for each
+   * StackFrame when grabbing the current stack trace.
+   * Note: these options are deprecated and we always collect all available
+   * information (kDetailed).
+   */
+  enum StackTraceOptions {
+    kLineNumber = 1,
+    kColumnOffset = 1 << 1 | kLineNumber,
+    kScriptName = 1 << 2,
+    kFunctionName = 1 << 3,
+    kIsEval = 1 << 4,
+    kIsConstructor = 1 << 5,
+    kScriptNameOrSourceURL = 1 << 6,
+    kScriptId = 1 << 7,
+    kExposeFramesAcrossSecurityOrigins = 1 << 8,
+    kOverview = kLineNumber | kColumnOffset | kScriptName | kFunctionName,
+    kDetailed = kOverview | kIsEval | kIsConstructor | kScriptNameOrSourceURL
+  };
+
+  /**
+   * Returns a StackFrame at a particular index.
+   */
+  Local<StackFrame> GetFrame(Isolate* isolate, uint32_t index) const;
+
+  /**
+   * Returns the number of StackFrames.
+   */
+  int GetFrameCount() const;
+
+  /**
+   * Grab a snapshot of the current JavaScript execution stack.
+   *
+   * \param frame_limit The maximum number of stack frames we want to capture.
+   * \param options Enumerates the set of things we will capture for each
+   *   StackFrame.
+   */
+  static Local<StackTrace> CurrentStackTrace(
+      Isolate* isolate, int frame_limit, StackTraceOptions options = kDetailed);
+};
+
+}  // namespace v8
+
+#endif  // INCLUDE_V8_DEBUG_H_

include/v8-embedder-heap.h

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_V8_EMBEDDER_HEAP_H_
+#define INCLUDE_V8_EMBEDDER_HEAP_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <utility>
+#include <vector>
+
+#include "cppgc/common.h"
+#include "v8-local-handle.h"   // NOLINT(build/include_directory)
+#include "v8-traced-handle.h"  // NOLINT(build/include_directory)
+#include "v8config.h"          // NOLINT(build/include_directory)
+
+namespace v8 {
+
+class Data;
+class Isolate;
+class Value;
+
+namespace internal {
+class LocalEmbedderHeapTracer;
+}  // namespace internal
+
+/**
+ * Handler for embedder roots on non-unified heap garbage collections.
+ */
+class V8_EXPORT EmbedderRootsHandler {
+ public:
+  virtual ~EmbedderRootsHandler() = default;
+
+  /**
+   * Returns true if the TracedGlobal handle should be considered as root for
+   * the currently running non-tracing garbage collection and false otherwise.
+   * The default implementation will keep all TracedGlobal references as roots.
+   *
+   * If this returns false, then V8 may decide that the object referred to by
+   * such a handle is reclaimed. In that case:
+   * - No action is required if handles are used with destructors, i.e., by just
+   *   using |TracedGlobal|.
+   * - When run without destructors, i.e., by using |TracedReference|, V8 calls
+   *  |ResetRoot|.
+   *
+   * Note that the |handle| is different from the handle that the embedder holds
+   * for retaining the object. The embedder may use |WrapperClassId()| to
+   * distinguish cases where it wants handles to be treated as roots from not
+   * being treated as roots.
+   */
+  virtual bool IsRoot(const v8::TracedReference<v8::Value>& handle) = 0;
+  virtual bool IsRoot(const v8::TracedGlobal<v8::Value>& handle) = 0;
+
+  /**
+   * Used in combination with |IsRoot|. Called by V8 when an
+   * object that is backed by a handle is reclaimed by a non-tracing garbage
+   * collection. It is up to the embedder to reset the original handle.
+   *
+   * Note that the |handle| is different from the handle that the embedder holds
+   * for retaining the object. It is up to the embedder to find the original
+   * handle via the object or class id.
+   */
+  virtual void ResetRoot(const v8::TracedReference<v8::Value>& handle) = 0;
+};
+
+/**
+ * Interface for tracing through the embedder heap. During a V8 garbage
+ * collection, V8 collects hidden fields of all potential wrappers, and at the
+ * end of its marking phase iterates the collection and asks the embedder to
+ * trace through its heap and use reporter to report each JavaScript object
+ * reachable from any of the given wrappers.
+ */
+class V8_EXPORT EmbedderHeapTracer {
+ public:
+  using EmbedderStackState = cppgc::EmbedderStackState;
+
+  enum TraceFlags : uint64_t {
+    kNoFlags = 0,
+    kReduceMemory = 1 << 0,
+    kForced = 1 << 2,
+  };
+
+  /**
+   * Interface for iterating through TracedGlobal handles.
+   */
+  class V8_EXPORT TracedGlobalHandleVisitor {
+   public:
+    virtual ~TracedGlobalHandleVisitor() = default;
+    virtual void VisitTracedGlobalHandle(const TracedGlobal<Value>& handle) {}
+    virtual void VisitTracedReference(const TracedReference<Value>& handle) {}
+  };
+
+  /**
+   * Summary of a garbage collection cycle. See |TraceEpilogue| on how the
+   * summary is reported.
+   */
+  struct TraceSummary {
+    /**
+     * Time spent managing the retained memory in milliseconds. This can e.g.
+     * include the time tracing through objects in the embedder.
+     */
+    double time = 0.0;
+
+    /**
+     * Memory retained by the embedder through the |EmbedderHeapTracer|
+     * mechanism in bytes.
+     */
+    size_t allocated_size = 0;
+  };
+
+  virtual ~EmbedderHeapTracer() = default;
+
+  /**
+   * Iterates all TracedGlobal handles created for the v8::Isolate the tracer is
+   * attached to.
+   */
+  void IterateTracedGlobalHandles(TracedGlobalHandleVisitor* visitor);
+
+  /**
+   * Called by the embedder to set the start of the stack which is e.g. used by
+   * V8 to determine whether handles are used from stack or heap.
+   */
+  void SetStackStart(void* stack_start);
+
+  /**
+   * Called by the embedder to notify V8 of an empty execution stack.
+   */
+  V8_DEPRECATE_SOON(
+      "This call only optimized internal caches which V8 is able to figure out "
+      "on its own now.")
+  void NotifyEmptyEmbedderStack();
+
+  /**
+   * Called by v8 to register internal fields of found wrappers.
+   *
+   * The embedder is expected to store them somewhere and trace reachable
+   * wrappers from them when called through |AdvanceTracing|.
+   */
+  virtual void RegisterV8References(
+      const std::vector<std::pair<void*, void*>>& embedder_fields) = 0;
+
+  void RegisterEmbedderReference(const BasicTracedReference<v8::Data>& ref);
+
+  /**
+   * Called at the beginning of a GC cycle.
+   */
+  virtual void TracePrologue(TraceFlags flags) {}
+
+  /**
+   * Called to advance tracing in the embedder.
+   *
+   * The embedder is expected to trace its heap starting from wrappers reported
+   * by RegisterV8References method, and report back all reachable wrappers.
+   * Furthermore, the embedder is expected to stop tracing by the given
+   * deadline. A deadline of infinity means that tracing should be finished.
+   *
+   * Returns |true| if tracing is done, and false otherwise.
+   */
+  virtual bool AdvanceTracing(double deadline_in_ms) = 0;
+
+  /*
+   * Returns true if there no more tracing work to be done (see AdvanceTracing)
+   * and false otherwise.
+   */
+  virtual bool IsTracingDone() = 0;
+
+  /**
+   * Called at the end of a GC cycle.
+   *
+   * Note that allocation is *not* allowed within |TraceEpilogue|. Can be
+   * overriden to fill a |TraceSummary| that is used by V8 to schedule future
+   * garbage collections.
+   */
+  virtual void TraceEpilogue(TraceSummary* trace_summary) {}
+
+  /**
+   * Called upon entering the final marking pause. No more incremental marking
+   * steps will follow this call.
+   */
+  virtual void EnterFinalPause(EmbedderStackState stack_state) = 0;
+
+  /*
+   * Called by the embedder to request immediate finalization of the currently
+   * running tracing phase that has been started with TracePrologue and not
+   * yet finished with TraceEpilogue.
+   *
+   * Will be a noop when currently not in tracing.
+   *
+   * This is an experimental feature.
+   */
+  void FinalizeTracing();
+
+  /**
+   * See documentation on EmbedderRootsHandler.
+   */
+  virtual bool IsRootForNonTracingGC(
+      const v8::TracedReference<v8::Value>& handle);
+  virtual bool IsRootForNonTracingGC(const v8::TracedGlobal<v8::Value>& handle);
+
+  /**
+   * See documentation on EmbedderRootsHandler.
+   */
+  virtual void ResetHandleInNonTracingGC(
+      const v8::TracedReference<v8::Value>& handle);
+
+  /*
+   * Called by the embedder to immediately perform a full garbage collection.
+   *
+   * Should only be used in testing code.
+   */
+  void GarbageCollectionForTesting(EmbedderStackState stack_state);
+
+  /*
+   * Called by the embedder to signal newly allocated or freed memory. Not bound
+   * to tracing phases. Embedders should trade off when increments are reported
+   * as V8 may consult global heuristics on whether to trigger garbage
+   * collection on this change.
+   */
+  void IncreaseAllocatedSize(size_t bytes);
+  void DecreaseAllocatedSize(size_t bytes);
+
+  /*
+   * Returns the v8::Isolate this tracer is attached too and |nullptr| if it
+   * is not attached to any v8::Isolate.
+   */
+  v8::Isolate* isolate() const { return isolate_; }
+
+ protected:
+  v8::Isolate* isolate_ = nullptr;
+
+  friend class internal::LocalEmbedderHeapTracer;
+};
+
+}  // namespace v8
+
+#endif  // INCLUDE_V8_EMBEDDER_HEAP_H_

include/v8-exception.h

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_V8_EXCEPTION_H_
+#define INCLUDE_V8_EXCEPTION_H_
+
+#include <stddef.h>
+
+#include "v8-local-handle.h"  // NOLINT(build/include_directory)
+#include "v8config.h"         // NOLINT(build/include_directory)
+
+namespace v8 {
+
+class Context;
+class Isolate;
+class Message;
+class StackTrace;
+class String;
+class Value;
+
+namespace internal {
+class Isolate;
+class ThreadLocalTop;
+}  // namespace internal
+
+/**
+ * Create new error objects by calling the corresponding error object
+ * constructor with the message.
+ */
+class V8_EXPORT Exception {
+ public:
+  static Local<Value> RangeError(Local<String> message);
+  static Local<Value> ReferenceError(Local<String> message);
+  static Local<Value> SyntaxError(Local<String> message);
+  static Local<Value> TypeError(Local<String> message);
+  static Local<Value> WasmCompileError(Local<String> message);
+  static Local<Value> WasmLinkError(Local<String> message);
+  static Local<Value> WasmRuntimeError(Local<String> message);
+  static Local<Value> Error(Local<String> message);
+
+  /**
+   * Creates an error message for the given exception.
+   * Will try to reconstruct the original stack trace from the exception value,
+   * or capture the current stack trace if not available.
+   */
+  static Local<Message> CreateMessage(Isolate* isolate, Local<Value> exception);
+
+  /**
+   * Returns the original stack trace that was captured at the creation time
+   * of a given exception, or an empty handle if not available.
+   */
+  static Local<StackTrace> GetStackTrace(Local<Value> exception);
+};
+
+/**
+ * An external exception handler.
+ */
+class V8_EXPORT TryCatch {
+ public:
+  /**
+   * Creates a new try/catch block and registers it with v8.  Note that
+   * all TryCatch blocks should be stack allocated because the memory
+   * location itself is compared against JavaScript try/catch blocks.
+   */
+  explicit TryCatch(Isolate* isolate);
+
+  /**
+   * Unregisters and deletes this try/catch block.
+   */
+  ~TryCatch();
+
+  /**
+   * Returns true if an exception has been caught by this try/catch block.
+   */
+  bool HasCaught() const;
+
+  /**
+   * For certain types of exceptions, it makes no sense to continue execution.
+   *
+   * If CanContinue returns false, the correct action is to perform any C++
+   * cleanup needed and then return.  If CanContinue returns false and
+   * HasTerminated returns true, it is possible to call
+   * CancelTerminateExecution in order to continue calling into the engine.
+   */
+  bool CanContinue() const;
+
+  /**
+   * Returns true if an exception has been caught due to script execution
+   * being terminated.
+   *
+   * There is no JavaScript representation of an execution termination
+   * exception.  Such exceptions are thrown when the TerminateExecution
+   * methods are called to terminate a long-running script.
+   *
+   * If such an exception has been thrown, HasTerminated will return true,
+   * indicating that it is possible to call CancelTerminateExecution in order
+   * to continue calling into the engine.
+   */
+  bool HasTerminated() const;
+
+  /**
+   * Throws the exception caught by this TryCatch in a way that avoids
+   * it being caught again by this same TryCatch.  As with ThrowException
+   * it is illegal to execute any JavaScript operations after calling
+   * ReThrow; the caller must return immediately to where the exception
+   * is caught.
+   */
+  Local<Value> ReThrow();
+
+  /**
+   * Returns the exception caught by this try/catch block.  If no exception has
+   * been caught an empty handle is returned.
+   */
+  Local<Value> Exception() const;
+
+  /**
+   * Returns the .stack property of an object.  If no .stack
+   * property is present an empty handle is returned.
+   */
+  V8_WARN_UNUSED_RESULT static MaybeLocal<Value> StackTrace(
+      Local<Context> context, Local<Value> exception);
+
+  /**
+   * Returns the .stack property of the thrown object.  If no .stack property is
+   * present or if this try/catch block has not caught an exception, an empty
+   * handle is returned.
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<Value> StackTrace(
+      Local<Context> context) const;
+
+  /**
+   * Returns the message associated with this exception.  If there is
+   * no message associated an empty handle is returned.
+   */
+  Local<v8::Message> Message() const;
+
+  /**
+   * Clears any exceptions that may have been caught by this try/catch block.
+   * After this method has been called, HasCaught() will return false. Cancels
+   * the scheduled exception if it is caught and ReThrow() is not called before.
+   *
+   * It is not necessary to clear a try/catch block before using it again; if
+   * another exception is thrown the previously caught exception will just be
+   * overwritten.  However, it is often a good idea since it makes it easier
+   * to determine which operation threw a given exception.
+   */
+  void Reset();
+
+  /**
+   * Set verbosity of the external exception handler.
+   *
+   * By default, exceptions that are caught by an external exception
+   * handler are not reported.  Call SetVerbose with true on an
+   * external exception handler to have exceptions caught by the
+   * handler reported as if they were not caught.
+   */
+  void SetVerbose(bool value);
+
+  /**
+   * Returns true if verbosity is enabled.
+   */
+  bool IsVerbose() const;
+
+  /**
+   * Set whether or not this TryCatch should capture a Message object
+   * which holds source information about where the exception
+   * occurred.  True by default.
+   */
+  void SetCaptureMessage(bool value);
+
+  V8_DEPRECATE_SOON(
+      "This is private information that should not be exposed by the API")
+  static void* JSStackComparableAddress(TryCatch* handler) {
+    if (handler == nullptr) return nullptr;
+    return reinterpret_cast<void*>(handler->JSStackComparableAddressPrivate());
+  }
+
+  TryCatch(const TryCatch&) = delete;
+  void operator=(const TryCatch&) = delete;
+
+ private:
+  // Declaring operator new and delete as deleted is not spec compliant.
+  // Therefore declare them private instead to disable dynamic alloc
+  void* operator new(size_t size);
+  void* operator new[](size_t size);
+  void operator delete(void*, size_t);
+  void operator delete[](void*, size_t);
+
+  /**
+   * There are cases when the raw address of C++ TryCatch object cannot be
+   * used for comparisons with addresses into the JS stack. The cases are:
+   * 1) ARM, ARM64 and MIPS simulators which have separate JS stack.
+   * 2) Address sanitizer allocates local C++ object in the heap when
+   *    UseAfterReturn mode is enabled.
+   * This method returns address that can be used for comparisons with
+   * addresses into the JS stack. When neither simulator nor ASAN's
+   * UseAfterReturn is enabled, then the address returned will be the address
+   * of the C++ try catch handler itself.
+   */
+  internal::Address JSStackComparableAddressPrivate() {
+    return js_stack_comparable_address_;
+  }
+
+  void ResetInternal();
+
+  internal::Isolate* isolate_;
+  TryCatch* next_;
+  void* exception_;
+  void* message_obj_;
+  internal::Address js_stack_comparable_address_;
+  bool is_verbose_ : 1;
+  bool can_continue_ : 1;
+  bool capture_message_ : 1;
+  bool rethrow_ : 1;
+  bool has_terminated_ : 1;
+
+  friend class internal::Isolate;
+  friend class internal::ThreadLocalTop;
+};
+
+}  // namespace v8
+
+#endif  // INCLUDE_V8_EXCEPTION_H_

include/v8-extension.h

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_V8_EXTENSION_H_
+#define INCLUDE_V8_EXTENSION_H_
+
+#include <memory>
+
+#include "v8-local-handle.h"  // NOLINT(build/include_directory)
+#include "v8-primitive.h"     // NOLINT(build/include_directory)
+#include "v8config.h"         // NOLINT(build/include_directory)
+
+namespace v8 {
+
+class FunctionTemplate;
+
+// --- Extensions ---
+
+/**
+ * Ignore
+ */
+class V8_EXPORT Extension {
+ public:
+  // Note that the strings passed into this constructor must live as long
+  // as the Extension itself.
+  Extension(const char* name, const char* source = nullptr, int dep_count = 0,
+            const char** deps = nullptr, int source_length = -1);
+  virtual ~Extension() { delete source_; }
+  virtual Local<FunctionTemplate> GetNativeFunctionTemplate(
+      Isolate* isolate, Local<String> name) {
+    return Local<FunctionTemplate>();
+  }
+
+  const char* name() const { return name_; }
+  size_t source_length() const { return source_length_; }
+  const String::ExternalOneByteStringResource* source() const {
+    return source_;
+  }
+  int dependency_count() const { return dep_count_; }
+  const char** dependencies() const { return deps_; }
+  void set_auto_enable(bool value) { auto_enable_ = value; }
+  bool auto_enable() { return auto_enable_; }
+
+  // Disallow copying and assigning.
+  Extension(const Extension&) = delete;
+  void operator=(const Extension&) = delete;
+
+ private:
+  const char* name_;
+  size_t source_length_;  // expected to initialize before source_
+  String::ExternalOneByteStringResource* source_;
+  int dep_count_;
+  const char** deps_;
+  bool auto_enable_;
+};
+
+void V8_EXPORT RegisterExtension(std::unique_ptr<Extension>);
+
+}  // namespace v8
+
+#endif  // INCLUDE_V8_EXTENSION_H_

include/v8-external.h

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_V8_EXTERNAL_H_
+#define INCLUDE_V8_EXTERNAL_H_
+
+#include "v8-value.h"  // NOLINT(build/include_directory)
+#include "v8config.h"  // NOLINT(build/include_directory)
+
+namespace v8 {
+
+class Isolate;
+
+/**
+ * A JavaScript value that wraps a C++ void*. This type of value is mainly used
+ * to associate C++ data structures with JavaScript objects.
+ */
+class V8_EXPORT External : public Value {
+ public:
+  static Local<External> New(Isolate* isolate, void* value);
+  V8_INLINE static External* Cast(Value* value) {
+#ifdef V8_ENABLE_CHECKS
+    CheckCast(value);
+#endif
+    return static_cast<External*>(value);
+  }
+
+  void* Value() const;
+
+ private:
+  static void CheckCast(v8::Value* obj);
+};
+
+}  // namespace v8
+
+#endif  // INCLUDE_V8_EXTERNAL_H_

include/v8-fast-api-calls.h

@@ -225,9 +225,11 @@
 #include <tuple>
 #include <type_traits>
 
-#include "v8-internal.h"  // NOLINT(build/include_directory)
-#include "v8.h"           // NOLINT(build/include_directory)
-#include "v8config.h"     // NOLINT(build/include_directory)
+#include "v8-internal.h"      // NOLINT(build/include_directory)
+#include "v8-local-handle.h"  // NOLINT(build/include_directory)
+#include "v8-typed-array.h"   // NOLINT(build/include_directory)
+#include "v8-value.h"         // NOLINT(build/include_directory)
+#include "v8config.h"         // NOLINT(build/include_directory)
 
 namespace v8 {
 

include/v8-forward.h

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_V8_LOCAL_HANDLES_H_
+#define INCLUDE_V8_LOCAL_HANDLES_H_
+
+// This header is intended to be used by headers that pass around V8 types,
+// either by pointer or using Local<Type>. The full definitions can be included
+// either via v8.h or the more fine-grained headers.
+
+#include "v8-local-handle.h"  // NOLINT(build/include_directory)
+
+namespace v8 {
+
+class AccessorSignature;
+class Array;
+class ArrayBuffer;
+class ArrayBufferView;
+class BigInt;
+class BigInt64Array;
+class BigIntObject;
+class BigUint64Array;
+class Boolean;
+class BooleanObject;
+class Context;
+class DataView;
+class Data;
+class Date;
+class External;
+class FixedArray;
+class Float32Array;
+class Float64Array;
+class Function;
+template <class F>
+class FunctionCallbackInfo;
+class FunctionTemplate;
+class Int16Array;
+class Int32;
+class Int32Array;
+class Int8Array;
+class Integer;
+class Isolate;
+class Map;
+class Module;
+class Name;
+class Number;
+class NumberObject;
+class Object;
+class ObjectTemplate;
+class Platform;
+class Primitive;
+class Private;
+class Promise;
+class Proxy;
+class RegExp;
+class Script;
+class Set;
+class SharedArrayBuffer;
+class Signature;
+class String;
+class StringObject;
+class Symbol;
+class SymbolObject;
+class Template;
+class TypedArray;
+class Uint16Array;
+class Uint32;
+class Uint32Array;
+class Uint8Array;
+class Uint8ClampedArray;
+class UnboundModuleScript;
+class Value;
+class WasmMemoryObject;
+class WasmModuleObject;
+
+}  // namespace v8
+
+#endif  // INCLUDE_V8_LOCAL_HANDLES_H_

include/v8-function.h

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_V8_FUNCTION_H_
+#define INCLUDE_V8_FUNCTION_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "v8-function-callback.h"  // NOLINT(build/include_directory)
+#include "v8-local-handle.h"       // NOLINT(build/include_directory)
+#include "v8-message.h"            // NOLINT(build/include_directory)
+#include "v8-object.h"             // NOLINT(build/include_directory)
+#include "v8-template.h"           // NOLINT(build/include_directory)
+#include "v8config.h"              // NOLINT(build/include_directory)
+
+namespace v8 {
+
+class Context;
+
+/**
+ * A JavaScript function object (ECMA-262, 15.3).
+ */
+class V8_EXPORT Function : public Object {
+ public:
+  /**
+   * Create a function in the current execution context
+   * for a given FunctionCallback.
+   */
+  static MaybeLocal<Function> New(
+      Local<Context> context, FunctionCallback callback,
+      Local<Value> data = Local<Value>(), int length = 0,
+      ConstructorBehavior behavior = ConstructorBehavior::kAllow,
+      SideEffectType side_effect_type = SideEffectType::kHasSideEffect);
+
+  V8_WARN_UNUSED_RESULT MaybeLocal<Object> NewInstance(
+      Local<Context> context, int argc, Local<Value> argv[]) const;
+
+  V8_WARN_UNUSED_RESULT MaybeLocal<Object> NewInstance(
+      Local<Context> context) const {
+    return NewInstance(context, 0, nullptr);
+  }
+
+  /**
+   * When side effect checks are enabled, passing kHasNoSideEffect allows the
+   * constructor to be invoked without throwing. Calls made within the
+   * constructor are still checked.
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<Object> NewInstanceWithSideEffectType(
+      Local<Context> context, int argc, Local<Value> argv[],
+      SideEffectType side_effect_type = SideEffectType::kHasSideEffect) const;
+
+  V8_WARN_UNUSED_RESULT MaybeLocal<Value> Call(Local<Context> context,
+                                               Local<Value> recv, int argc,
+                                               Local<Value> argv[]);
+
+  void SetName(Local<String> name);
+  Local<Value> GetName() const;
+
+  /**
+   * Name inferred from variable or property assignment of this function.
+   * Used to facilitate debugging and profiling of JavaScript code written
+   * in an OO style, where many functions are anonymous but are assigned
+   * to object properties.
+   */
+  Local<Value> GetInferredName() const;
+
+  /**
+   * displayName if it is set, otherwise name if it is configured, otherwise
+   * function name, otherwise inferred name.
+   */
+  Local<Value> GetDebugName() const;
+
+  /**
+   * Returns zero based line number of function body and
+   * kLineOffsetNotFound if no information available.
+   */
+  int GetScriptLineNumber() const;
+  /**
+   * Returns zero based column number of function body and
+   * kLineOffsetNotFound if no information available.
+   */
+  int GetScriptColumnNumber() const;
+
+  /**
+   * Returns scriptId.
+   */
+  int ScriptId() const;
+
+  /**
+   * Returns the original function if this function is bound, else returns
+   * v8::Undefined.
+   */
+  Local<Value> GetBoundFunction() const;
+
+  /**
+   * Calls builtin Function.prototype.toString on this function.
+   * This is different from Value::ToString() that may call a user-defined
+   * toString() function, and different than Object::ObjectProtoToString() which
+   * always serializes "[object Function]".
+   */
+  V8_WARN_UNUSED_RESULT MaybeLocal<String> FunctionProtoToString(
+      Local<Context> context);
+
+  ScriptOrigin GetScriptOrigin() const;
+  V8_INLINE static Function* Cast(Value* value) {
+#ifdef V8_ENABLE_CHECKS
+    CheckCast(value);
+#endif
+    return static_cast<Function*>(value);
+  }
+
+  static const int kLineOffsetNotFound;
+
+ private:
+  Function();
+  static void CheckCast(Value* obj);
+};
+}  // namespace v8
+
+#endif  // INCLUDE_V8_FUNCTION_H_

include/v8-initialization.h

+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef INCLUDE_V8_INITIALIZATION_H_
+#define INCLUDE_V8_INITIALIZATION_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "v8-internal.h"  // NOLINT(build/include_directory)
+#include "v8-isolate.h"   // NOLINT(build/include_directory)
+#include "v8-platform.h"  // NOLINT(build/include_directory)
+#include "v8config.h"     // NOLINT(build/include_directory)
+
+// We reserve the V8_* prefix for macros defined in V8 public API and
+// assume there are no name conflicts with the embedder's code.
+
+/**
+ * The v8 JavaScript engine.
+ */
+namespace v8 {
+
+class PageAllocator;
+class Platform;
+template <class K, class V, class T>
+class PersistentValueMapBase;
+
+/**
+ * EntropySource is used as a callback function when v8 needs a source
+ * of entropy.
+ */
+using EntropySource = bool (*)(unsigned char* buffer, size_t length);
+
+/**
+ * ReturnAddressLocationResolver is used as a callback function when v8 is
+ * resolving the location of a return address on the stack. Profilers that
+ * change the return address on the stack can use this to resolve the stack
+ * location to wherever the profiler stashed the original return address.
+ *
+ * \param return_addr_location A location on stack where a machine
+ *    return address resides.
+ * \returns Either return_addr_location, or else a pointer to the profiler's
+ *    copy of the original return address.
+ *
+ * \note The resolver function must not cause garbage collection.
+ */
+using ReturnAddressLocationResolver =
+    uintptr_t (*)(uintptr_t return_addr_location);
+
+using DcheckErrorCallback = void (*)(const char* file, int line,
+                                     const char* message);
+
+/**
+ * Container class for static utility functions.
+ */
+class V8_EXPORT V8 {
+ public:
+  /**
+   * Hand startup data to V8, in case the embedder has chosen to build
+   * V8 with external startup data.
+   *
+   * Note:
+   * - By default the startup data is linked into the V8 library, in which
+   *   case this function is not meaningful.
+   * - If this needs to be called, it needs to be called before V8
+   *   tries to make use of its built-ins.
+   * - To avoid unnecessary copies of data, V8 will point directly into the
+   *   given data blob, so pretty please keep it around until V8 exit.
+   * - Compression of the startup blob might be useful, but needs to
+   *   handled entirely on the embedders' side.
+   * - The call will abort if the data is invalid.
+   */
+  static void SetSnapshotDataBlob(StartupData* startup_blob);
+
+  /** Set the callback to invoke in case of Dcheck failures. */
+  static void SetDcheckErrorHandler(DcheckErrorCallback that);
+
+  /**
+   * Sets V8 flags from a string.
+   */
+  static void SetFlagsFromString(const char* str);
+  static void SetFlagsFromString(const char* str, size_t length);
+
+  /**
+   * Sets V8 flags from the command line.
+   */
+  static void SetFlagsFromCommandLine(int* argc, char** argv,
+                                      bool remove_flags);
+
+  /** Get the version string. */
+  static const char* GetVersion();
+
+  /**
+   * Initializes V8. This function needs to be called before the first Isolate
+   * is created. It always returns true.
+   */
+  V8_INLINE static bool Initialize() {
+    const int kBuildConfiguration =
+        (internal::PointerCompressionIsEnabled() ? kPointerCompression : 0) |
+        (internal::SmiValuesAre31Bits() ? k31BitSmis : 0) |
+        (internal::HeapSandboxIsEnabled() ? kHeapSandbox : 0) |
+        (internal::VirtualMemoryCageIsEnabled() ? kVirtualMemoryCage : 0);
+    return Initialize(kBuildConfiguration);
+  }
+
+  /**
+   * Allows the host application to provide a callback which can be used
+   * as a source of entropy for random number generators.
+   */
+  static void SetEntropySource(EntropySource source);
+
+  /**
+   * Allows the host application to provide a callback that allows v8 to
+   * cooperate with a profiler that rewrites return addresses on stack.
+   */
+  static void SetReturnAddressLocationResolver(
+      ReturnAddressLocationResolver return_address_resolver);
+
+  /**
+   * Releases any resources used by v8 and stops any utility threads
+   * that may be running.  Note that disposing v8 is permanent, it
+   * cannot be reinitialized.
+   *
+   * It should generally not be necessary to dispose v8 before exiting
+   * a process, this should happen automatically.  It is only necessary
+   * to use if the process needs the resources taken up by v8.
+   */
+  static bool Dispose();
+
+  /**
+   * Initialize the ICU library bundled with V8. The embedder should only
+   * invoke this method when using the bundled ICU. Returns true on success.
+   *
+   * If V8 was compiled with the ICU data in an external file, the location
+   * of the data file has to be provided.
+   */
+  static bool InitializeICU(const char* icu_data_file = nullptr);
+
+  /**
+   * Initialize the ICU library bundled with V8. The embedder should only
+   * invoke this method when using the bundled ICU. If V8 was compiled with
+   * the ICU data in an external file and when the default location of that
+   * file should be used, a path to the executable must be provided.
+   * Returns true on success.
+   *
+   * The default is a file called icudtl.dat side-by-side with the executable.
+   *
+   * Optionally, the location of the data file can be provided to override the
+   * default.
+   */
+  static bool InitializeICUDefaultLocation(const char* exec_path,
+                                           const char* icu_data_file = nullptr);
+
+  /**
+   * Initialize the external startup data. The embedder only needs to
+   * invoke this method when external startup data was enabled in a build.
+   *
+   * If V8 was compiled with the startup data in an external file, then
+   * V8 needs to be given those external files during startup. There are
+   * three ways to do this:
+   * - InitializeExternalStartupData(const char*)
+   *   This will look in the given directory for the file "snapshot_blob.bin".
+   * - InitializeExternalStartupDataFromFile(const char*)
+   *   As above, but will directly use the given file name.
+   * - Call SetSnapshotDataBlob.
+   *   This will read the blobs from the given data structure and will
+   *   not perform any file IO.
+   */
+  static void InitializeExternalStartupData(const char* directory_path);
+  static void InitializeExternalStartupDataFromFile(const char* snapshot_blob);
+
+  /**
+   * Sets the v8::Platform to use. This should be invoked before V8 is
+   * initialized.
+   */
+  static void InitializePlatform(Platform* platform);
+
+  /**
+   * Clears all references to the v8::Platform. This should be invoked after
+   * V8 was disposed.
+   */
+  static void ShutdownPlatform();
+
+#ifdef V8_VIRTUAL_MEMORY_CAGE
+  //
+  // Virtual Memory Cage related API.
+  //
+  // This API is not yet stable and subject to changes in the future.
+  //
+
+  /**
+   * Initializes the virtual memory cage for V8.
+   *
+   * This must be invoked after the platform was initialized but before V8 is
+   * initialized. The virtual memory cage is torn down during platform shutdown.
+   * Returns true on success, false otherwise.
+   */
+  static bool InitializeVirtualMemoryCage();
+
+  /**
+   * Provides access to the data page allocator for the virtual memory cage.
+   *
+   * This allocator allocates pages inside the data cage part of the virtual
+   * memory cage in which data buffers such as ArrayBuffer backing stores must
+   * be allocated. Objects in this region should generally consists purely of
+   * data and not contain any pointers. It should be assumed that an attacker
+   * can corrupt data inside the cage, and so in particular the contents of
+   * pages returned by this allocator, arbitrarily and concurrently.
+   *
+   * The virtual memory cage must have been initialized before.
+   */
+  static PageAllocator* GetVirtualMemoryCageDataPageAllocator();
+#endif
+
+  /**
+   * Activate trap-based bounds checking for WebAssembly.
+   *
+   * \param use_v8_signal_handler Whether V8 should install its own signal
+   * handler or rely on the embedder's.
+   */
+  static bool EnableWebAssemblyTrapHandler(bool use_v8_signal_handler);
+
+#if defined(V8_OS_WIN)
+  /**
+   * On Win64, by default V8 does not emit unwinding data for jitted code,
+   * which means the OS cannot walk the stack frames and the system Structured
+   * Exception Handling (SEH) cannot unwind through V8-generated code:
+   * https://code.google.com/p/v8/issues/detail?id=3598.
+   *
+   * This function allows embedders to register a custom exception handler for
+   * exceptions in V8-generated code.
+   */
+  static void SetUnhandledExceptionCallback(
+      UnhandledExceptionCallback unhandled_exception_callback);
+#endif
+
+  /**
+   * Get statistics about the shared memory usage.
+   */
+  static void GetSharedMemoryStatistics(SharedMemoryStatistics* statistics);
+
+ private:
+  V8();
+
+  enum BuildConfigurationFeatures {
+    kPointerCompression = 1 << 0,
+    k31BitSmis = 1 << 1,
+    kHeapSandbox = 1 << 2,
+    kVirtualMemoryCage = 1 << 3,
+  };
+
+  /**
+   * Checks that the embedder build configuration is compatible with
+   * the V8 binary and if so initializes V8.
+   */
+  static bool Initialize(int build_config);
+
+  friend class Context;
+  template <class K, class V, class T>
+  friend class PersistentValueMapBase;
+};
+
+}  // namespace v8
+
+#endif  // INCLUDE_V8_INITIALIZATION_H_

include/v8-inspector.h

@@ -6,11 +6,23 @@
 #define V8_V8_INSPECTOR_H_
 
 #include <stdint.h>
-#include <cctype>
 
+#include <cctype>
 #include <memory>
 
-#include "v8.h"  // NOLINT(build/include_directory)
+#include "v8-isolate.h"       // NOLINT(build/include_directory)
+#include "v8-local-handle.h"  // NOLINT(build/include_directory)
+
+// TODO(v8:11965) Remove this when chrome includes it directly where needed.
+#include "v8-script.h"  // NOLINT(build/include_directory)
+
+namespace v8 {
+class Context;
+class Name;
+class Object;
+class StackTrace;
+class Value;
+}  // namespace v8
 
 namespace v8_inspector {
 

samples/hello-world.cc

@@ -7,7 +7,12 @@
 #include <string.h>
 
 #include "include/libplatform/libplatform.h"
-#include "include/v8.h"
+#include "include/v8-context.h"
+#include "include/v8-initialization.h"
+#include "include/v8-isolate.h"
+#include "include/v8-local-handle.h"
+#include "include/v8-primitive.h"
+#include "include/v8-script.h"
 
 int main(int argc, char* argv[]) {
   // Initialize V8.