Use UnownedPtr<> to v8::Isolates.

Isolates are long-lived, but this may catch a few things.
Introduce CFX_V8IsolateDeleter for unique_ptr<v8::Isolate> usage.
Fix Dispose()/SetIsolate(nullptr) ordering in cjs_runtime.cpp
Remove one unused isolate member.
Flip protected -> private in one place.

Change-Id: I26cdd120f799192e93b0d9d04dcde8f348dc21f3
Reviewed-on: https://pdfium-review.googlesource.com/37931
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

13 files changed, 203 insertions, 177 deletions

diff --git a/fxjs/cfx_v8.cpp b/fxjs/cfx_v8.cpp
index 4738030236..1d2dd94e27 100644
--- a/fxjs/cfx_v8.cpp
+++ b/fxjs/cfx_v8.cpp
@@ -9,7 +9,7 @@
 #include "core/fxcrt/fx_memory.h"
 #include "third_party/base/allocator/partition_allocator/partition_alloc.h"
 
-CFX_V8::CFX_V8(v8::Isolate* isolate) : m_isolate(isolate) {}
+CFX_V8::CFX_V8(v8::Isolate* isolate) : m_pIsolate(isolate) {}
 
 CFX_V8::~CFX_V8() = default;
 
@@ -19,7 +19,7 @@ v8::Local<v8::Value> CFX_V8::GetObjectProperty(
   if (pObj.IsEmpty())
     return v8::Local<v8::Value>();
   v8::Local<v8::Value> val;
-  if (!pObj->Get(m_isolate->GetCurrentContext(),
+  if (!pObj->Get(m_pIsolate->GetCurrentContext(),
                  NewString(wsPropertyName.AsStringView()))
            .ToLocal(&val))
     return v8::Local<v8::Value>();
@@ -32,7 +32,7 @@ std::vector<WideString> CFX_V8::GetObjectPropertyNames(
     return std::vector<WideString>();
 
   v8::Local<v8::Array> val;
-  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  v8::Local<v8::Context> context = m_pIsolate->GetCurrentContext();
   if (!pObj->GetPropertyNames(context).ToLocal(&val))
     return std::vector<WideString>();
 
@@ -49,17 +49,22 @@ void CFX_V8::PutObjectProperty(v8::Local<v8::Object> pObj,
                                v8::Local<v8::Value> pPut) {
   if (pObj.IsEmpty())
     return;
-  pObj->Set(m_isolate->GetCurrentContext(),
+  pObj->Set(m_pIsolate->GetCurrentContext(),
             NewString(wsPropertyName.AsStringView()), pPut)
       .FromJust();
 }
 
+void CFX_V8::DisposeIsolate() {
+  if (m_pIsolate)
+    m_pIsolate.Release()->Dispose();
+}
+
 v8::Local<v8::Array> CFX_V8::NewArray() {
-  return v8::Array::New(m_isolate);
+  return v8::Array::New(GetIsolate());
 }
 
 v8::Local<v8::Object> CFX_V8::NewObject() {
-  return v8::Object::New(m_isolate);
+  return v8::Object::New(GetIsolate());
 }
 
 unsigned CFX_V8::PutArrayElement(v8::Local<v8::Array> pArray,
@@ -67,7 +72,7 @@ unsigned CFX_V8::PutArrayElement(v8::Local<v8::Array> pArray,
                                  v8::Local<v8::Value> pValue) {
   if (pArray.IsEmpty())
     return 0;
-  if (pArray->Set(m_isolate->GetCurrentContext(), index, pValue).IsNothing())
+  if (pArray->Set(m_pIsolate->GetCurrentContext(), index, pValue).IsNothing())
     return 0;
   return 1;
 }
@@ -77,7 +82,7 @@ v8::Local<v8::Value> CFX_V8::GetArrayElement(v8::Local<v8::Array> pArray,
   if (pArray.IsEmpty())
     return v8::Local<v8::Value>();
   v8::Local<v8::Value> val;
-  if (!pArray->Get(m_isolate->GetCurrentContext(), index).ToLocal(&val))
+  if (!pArray->Get(m_pIsolate->GetCurrentContext(), index).ToLocal(&val))
     return v8::Local<v8::Value>();
   return val;
 }
@@ -89,23 +94,23 @@ unsigned CFX_V8::GetArrayLength(v8::Local<v8::Array> pArray) {
 }
 
 v8::Local<v8::Number> CFX_V8::NewNumber(int number) {
-  return v8::Int32::New(m_isolate, number);
+  return v8::Int32::New(GetIsolate(), number);
 }
 
 v8::Local<v8::Number> CFX_V8::NewNumber(double number) {
-  return v8::Number::New(m_isolate, number);
+  return v8::Number::New(GetIsolate(), number);
 }
 
 v8::Local<v8::Number> CFX_V8::NewNumber(float number) {
-  return v8::Number::New(m_isolate, (float)number);
+  return v8::Number::New(GetIsolate(), (float)number);
 }
 
 v8::Local<v8::Boolean> CFX_V8::NewBoolean(bool b) {
-  return v8::Boolean::New(m_isolate, b);
+  return v8::Boolean::New(GetIsolate(), b);
 }
 
 v8::Local<v8::String> CFX_V8::NewString(const ByteStringView& str) {
-  v8::Isolate* pIsolate = m_isolate ? m_isolate : v8::Isolate::GetCurrent();
+  v8::Isolate* pIsolate = m_pIsolate ? GetIsolate() : v8::Isolate::GetCurrent();
   return v8::String::NewFromUtf8(pIsolate, str.unterminated_c_str(),
                                  v8::NewStringType::kNormal, str.GetLength())
       .ToLocalChecked();
@@ -119,15 +124,15 @@ v8::Local<v8::String> CFX_V8::NewString(const WideStringView& str) {
 }
 
 v8::Local<v8::Value> CFX_V8::NewNull() {
-  return v8::Null(m_isolate);
+  return v8::Null(GetIsolate());
 }
 
 v8::Local<v8::Value> CFX_V8::NewUndefined() {
-  return v8::Undefined(m_isolate);
+  return v8::Undefined(GetIsolate());
 }
 
 v8::Local<v8::Date> CFX_V8::NewDate(double d) {
-  return v8::Date::New(m_isolate->GetCurrentContext(), d)
+  return v8::Date::New(m_pIsolate->GetCurrentContext(), d)
       .ToLocalChecked()
       .As<v8::Date>();
 }
@@ -135,7 +140,7 @@ v8::Local<v8::Date> CFX_V8::NewDate(double d) {
 int CFX_V8::ToInt32(v8::Local<v8::Value> pValue) {
   if (pValue.IsEmpty())
     return 0;
-  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  v8::Local<v8::Context> context = m_pIsolate->GetCurrentContext();
   v8::MaybeLocal<v8::Int32> maybe_int32 = pValue->ToInt32(context);
   if (maybe_int32.IsEmpty())
     return 0;
@@ -145,7 +150,7 @@ int CFX_V8::ToInt32(v8::Local<v8::Value> pValue) {
 bool CFX_V8::ToBoolean(v8::Local<v8::Value> pValue) {
   if (pValue.IsEmpty())
     return false;
-  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  v8::Local<v8::Context> context = m_pIsolate->GetCurrentContext();
   v8::MaybeLocal<v8::Boolean> maybe_boolean = pValue->ToBoolean(context);
   if (maybe_boolean.IsEmpty())
     return false;
@@ -155,7 +160,7 @@ bool CFX_V8::ToBoolean(v8::Local<v8::Value> pValue) {
 double CFX_V8::ToDouble(v8::Local<v8::Value> pValue) {
   if (pValue.IsEmpty())
     return 0.0;
-  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  v8::Local<v8::Context> context = m_pIsolate->GetCurrentContext();
   v8::MaybeLocal<v8::Number> maybe_number = pValue->ToNumber(context);
   if (maybe_number.IsEmpty())
     return 0.0;
@@ -165,36 +170,36 @@ double CFX_V8::ToDouble(v8::Local<v8::Value> pValue) {
 WideString CFX_V8::ToWideString(v8::Local<v8::Value> pValue) {
   if (pValue.IsEmpty())
     return WideString();
-  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  v8::Local<v8::Context> context = m_pIsolate->GetCurrentContext();
   v8::MaybeLocal<v8::String> maybe_string = pValue->ToString(context);
   if (maybe_string.IsEmpty())
     return WideString();
-  v8::String::Utf8Value s(m_isolate, maybe_string.ToLocalChecked());
+  v8::String::Utf8Value s(GetIsolate(), maybe_string.ToLocalChecked());
   return WideString::FromUTF8(ByteStringView(*s, s.length()));
 }
 
 ByteString CFX_V8::ToByteString(v8::Local<v8::Value> pValue) {
   if (pValue.IsEmpty())
     return ByteString();
-  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  v8::Local<v8::Context> context = m_pIsolate->GetCurrentContext();
   v8::MaybeLocal<v8::String> maybe_string = pValue->ToString(context);
   if (maybe_string.IsEmpty())
     return ByteString();
-  v8::String::Utf8Value s(m_isolate, maybe_string.ToLocalChecked());
+  v8::String::Utf8Value s(GetIsolate(), maybe_string.ToLocalChecked());
   return ByteString(*s);
 }
 
 v8::Local<v8::Object> CFX_V8::ToObject(v8::Local<v8::Value> pValue) {
   if (pValue.IsEmpty() || !pValue->IsObject())
     return v8::Local<v8::Object>();
-  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  v8::Local<v8::Context> context = m_pIsolate->GetCurrentContext();
   return pValue->ToObject(context).ToLocalChecked();
 }
 
 v8::Local<v8::Array> CFX_V8::ToArray(v8::Local<v8::Value> pValue) {
   if (pValue.IsEmpty() || !pValue->IsArray())
     return v8::Local<v8::Array>();
-  v8::Local<v8::Context> context = m_isolate->GetCurrentContext();
+  v8::Local<v8::Context> context = m_pIsolate->GetCurrentContext();
   return v8::Local<v8::Array>::Cast(pValue->ToObject(context).ToLocalChecked());
 }
 
diff --git a/fxjs/cfx_v8.h b/fxjs/cfx_v8.h
index 08a18935ea..04468d5281 100644
--- a/fxjs/cfx_v8.h
+++ b/fxjs/cfx_v8.h
@@ -20,7 +20,7 @@ class CFX_V8 {
   explicit CFX_V8(v8::Isolate* pIsolate);
   virtual ~CFX_V8();
 
-  v8::Isolate* GetIsolate() const { return m_isolate; }
+  v8::Isolate* GetIsolate() const { return m_pIsolate.Get(); }
 
   v8::Local<v8::Value> NewNull();
   v8::Local<v8::Value> NewUndefined();
@@ -59,10 +59,11 @@ class CFX_V8 {
                          v8::Local<v8::Value> pValue);
 
  protected:
-  void SetIsolate(v8::Isolate* pIsolate) { m_isolate = pIsolate; }
+  void SetIsolate(v8::Isolate* pIsolate) { m_pIsolate = pIsolate; }
+  void DisposeIsolate();
 
  private:
-  v8::Isolate* m_isolate;
+  UnownedPtr<v8::Isolate> m_pIsolate;
 };
 
 class CFX_V8ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
@@ -72,4 +73,9 @@ class CFX_V8ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
   void Free(void* data, size_t length) override;
 };
 
+// Use with std::unique_ptr<v8::Isolate> to dispose of isolates correctly.
+struct CFX_V8IsolateDeleter {
+  inline void operator()(v8::Isolate* ptr) { ptr->Dispose(); }
+};
+
 #endif  // FXJS_CFX_V8_H_
diff --git a/fxjs/cfxjs_engine.cpp b/fxjs/cfxjs_engine.cpp
index 0978bee7c1..1a02ec9a78 100644
--- a/fxjs/cfxjs_engine.cpp
+++ b/fxjs/cfxjs_engine.cpp
@@ -10,6 +10,7 @@
 #include <utility>
 #include <vector>
 
+#include "core/fxcrt/unowned_ptr.h"
 #include "fxjs/cfxjse_runtimedata.h"
 #include "fxjs/cjs_object.h"
 
@@ -143,8 +144,10 @@ class CFXJS_ObjDefinition {
     m_Signature.Reset(isolate, sig);
   }
 
+  v8::Isolate* GetIsolate() const { return m_pIsolate.Get(); }
+
   void DefineConst(const char* sConstName, v8::Local<v8::Value> pDefault) {
-    GetInstanceTemplate()->Set(m_pIsolate, sConstName, pDefault);
+    GetInstanceTemplate()->Set(GetIsolate(), sConstName, pDefault);
   }
 
   void DefineProperty(v8::Local<v8::String> sPropName,
@@ -156,7 +159,7 @@ class CFXJS_ObjDefinition {
   void DefineMethod(v8::Local<v8::String> sMethodName,
                     v8::FunctionCallback pMethodCall) {
     v8::Local<v8::FunctionTemplate> fun = v8::FunctionTemplate::New(
-        m_pIsolate, pMethodCall, v8::Local<v8::Value>(), GetSignature());
+        GetIsolate(), pMethodCall, v8::Local<v8::Value>(), GetSignature());
     fun->RemovePrototype();
     GetInstanceTemplate()->Set(sMethodName, fun, v8::ReadOnly);
   }
@@ -172,23 +175,22 @@ class CFXJS_ObjDefinition {
   }
 
   v8::Local<v8::ObjectTemplate> GetInstanceTemplate() {
-    v8::EscapableHandleScope scope(m_pIsolate);
+    v8::EscapableHandleScope scope(GetIsolate());
     v8::Local<v8::FunctionTemplate> function =
-        m_FunctionTemplate.Get(m_pIsolate);
+        m_FunctionTemplate.Get(GetIsolate());
     return scope.Escape(function->InstanceTemplate());
   }
 
   v8::Local<v8::Signature> GetSignature() {
-    v8::EscapableHandleScope scope(m_pIsolate);
-    return scope.Escape(m_Signature.Get(m_pIsolate));
+    v8::EscapableHandleScope scope(GetIsolate());
+    return scope.Escape(m_Signature.Get(GetIsolate()));
   }
 
   const char* const m_ObjName;
   const FXJSOBJTYPE m_ObjType;
   const CFXJS_Engine::Constructor m_pConstructor;
   const CFXJS_Engine::Destructor m_pDestructor;
-
-  v8::Isolate* m_pIsolate;
+  UnownedPtr<v8::Isolate> m_pIsolate;
   v8::Global<v8::FunctionTemplate> m_FunctionTemplate;
   v8::Global<v8::Signature> m_Signature;
 };
diff --git a/fxjs/cfxjse_context.cpp b/fxjs/cfxjse_context.cpp
index 7ee561095b..32fdd60cda 100644
--- a/fxjs/cfxjse_context.cpp
+++ b/fxjs/cfxjse_context.cpp
@@ -198,10 +198,10 @@ CFXJSE_Context::CFXJSE_Context(v8::Isolate* pIsolate) : m_pIsolate(pIsolate) {}
 CFXJSE_Context::~CFXJSE_Context() {}
 
 std::unique_ptr<CFXJSE_Value> CFXJSE_Context::GetGlobalObject() {
-  auto pValue = pdfium::MakeUnique<CFXJSE_Value>(m_pIsolate);
+  auto pValue = pdfium::MakeUnique<CFXJSE_Value>(GetIsolate());
   CFXJSE_ScopeUtil_IsolateHandleContext scope(this);
   v8::Local<v8::Context> hContext =
-      v8::Local<v8::Context>::New(m_pIsolate, m_hContext);
+      v8::Local<v8::Context>::New(GetIsolate(), m_hContext);
   v8::Local<v8::Object> hGlobalObject =
       hContext->Global()->GetPrototype().As<v8::Object>();
   pValue->ForceSetValue(hGlobalObject);
@@ -209,7 +209,7 @@ std::unique_ptr<CFXJSE_Value> CFXJSE_Context::GetGlobalObject() {
 }
 
 v8::Local<v8::Context> CFXJSE_Context::GetContext() {
-  return v8::Local<v8::Context>::New(m_pIsolate, m_hContext);
+  return v8::Local<v8::Context>::New(GetIsolate(), m_hContext);
 }
 
 void CFXJSE_Context::AddClass(std::unique_ptr<CFXJSE_Class> pClass) {
@@ -234,10 +234,10 @@ bool CFXJSE_Context::ExecuteScript(const char* szScript,
                                    CFXJSE_Value* lpRetValue,
                                    CFXJSE_Value* lpNewThisObject) {
   CFXJSE_ScopeUtil_IsolateHandleContext scope(this);
-  v8::Local<v8::Context> hContext = m_pIsolate->GetCurrentContext();
-  v8::TryCatch trycatch(m_pIsolate);
+  v8::Local<v8::Context> hContext = GetIsolate()->GetCurrentContext();
+  v8::TryCatch trycatch(GetIsolate());
   v8::Local<v8::String> hScriptString =
-      v8::String::NewFromUtf8(m_pIsolate, szScript);
+      v8::String::NewFromUtf8(GetIsolate(), szScript);
   if (!lpNewThisObject) {
     v8::Local<v8::Script> hScript;
     if (v8::Script::Compile(hContext, hScriptString).ToLocal(&hScript)) {
@@ -246,25 +246,25 @@ bool CFXJSE_Context::ExecuteScript(const char* szScript,
       if (hScript->Run(hContext).ToLocal(&hValue)) {
         ASSERT(!trycatch.HasCaught());
         if (lpRetValue)
-          lpRetValue->m_hValue.Reset(m_pIsolate, hValue);
+          lpRetValue->m_hValue.Reset(GetIsolate(), hValue);
         return true;
       }
     }
     if (lpRetValue) {
-      lpRetValue->m_hValue.Reset(m_pIsolate,
-                                 CreateReturnValue(m_pIsolate, trycatch));
+      lpRetValue->m_hValue.Reset(GetIsolate(),
+                                 CreateReturnValue(GetIsolate(), trycatch));
     }
     return false;
   }
 
   v8::Local<v8::Value> hNewThis =
-      v8::Local<v8::Value>::New(m_pIsolate, lpNewThisObject->m_hValue);
+      v8::Local<v8::Value>::New(GetIsolate(), lpNewThisObject->m_hValue);
   ASSERT(!hNewThis.IsEmpty());
   v8::Local<v8::Script> hWrapper =
       v8::Script::Compile(
           hContext,
           v8::String::NewFromUtf8(
-              m_pIsolate, "(function () { return eval(arguments[0]); })"))
+              GetIsolate(), "(function () { return eval(arguments[0]); })"))
           .ToLocalChecked();
   v8::Local<v8::Value> hWrapperValue;
   if (hWrapper->Run(hContext).ToLocal(&hWrapperValue)) {
@@ -276,7 +276,7 @@ bool CFXJSE_Context::ExecuteScript(const char* szScript,
             .ToLocal(&hValue)) {
       ASSERT(!trycatch.HasCaught());
       if (lpRetValue)
-        lpRetValue->m_hValue.Reset(m_pIsolate, hValue);
+        lpRetValue->m_hValue.Reset(GetIsolate(), hValue);
 
       return true;
     }
@@ -297,8 +297,8 @@ bool CFXJSE_Context::ExecuteScript(const char* szScript,
 #endif  // NDEBUG
 
   if (lpRetValue) {
-    lpRetValue->m_hValue.Reset(m_pIsolate,
-                               CreateReturnValue(m_pIsolate, trycatch));
+    lpRetValue->m_hValue.Reset(GetIsolate(),
+                               CreateReturnValue(GetIsolate(), trycatch));
   }
   return false;
 }
diff --git a/fxjs/cfxjse_context.h b/fxjs/cfxjse_context.h
index b4db8f7a30..91c76d4c7a 100644
--- a/fxjs/cfxjse_context.h
+++ b/fxjs/cfxjse_context.h
@@ -10,6 +10,7 @@
 #include <memory>
 #include <vector>
 
+#include "core/fxcrt/unowned_ptr.h"
 #include "fxjs/fxjse.h"
 #include "v8/include/v8.h"
 
@@ -28,7 +29,7 @@ class CFXJSE_Context {
   explicit CFXJSE_Context(v8::Isolate* pIsolate);
   ~CFXJSE_Context();
 
-  v8::Isolate* GetIsolate() const { return m_pIsolate; }
+  v8::Isolate* GetIsolate() const { return m_pIsolate.Get(); }
   v8::Local<v8::Context> GetContext();
   std::unique_ptr<CFXJSE_Value> GetGlobalObject();
   void AddClass(std::unique_ptr<CFXJSE_Class> pClass);
@@ -38,12 +39,12 @@ class CFXJSE_Context {
                      CFXJSE_Value* lpRetValue,
                      CFXJSE_Value* lpNewThisObject = nullptr);
 
- protected:
+ private:
   CFXJSE_Context(const CFXJSE_Context&) = delete;
   CFXJSE_Context& operator=(const CFXJSE_Context&) = delete;
 
   v8::Global<v8::Context> m_hContext;
-  v8::Isolate* m_pIsolate;
+  UnownedPtr<v8::Isolate> m_pIsolate;
   std::vector<std::unique_ptr<CFXJSE_Class>> m_rgClasses;
 };
 
diff --git a/fxjs/cfxjse_formcalc_context.h b/fxjs/cfxjse_formcalc_context.h
index 51e3178c13..052bba394a 100644
--- a/fxjs/cfxjse_formcalc_context.h
+++ b/fxjs/cfxjse_formcalc_context.h
@@ -10,6 +10,7 @@
 #include <memory>
 #include <vector>
 
+#include "core/fxcrt/unowned_ptr.h"
 #include "fxjs/cfxjse_arguments.h"
 #include "fxjs/cfxjse_context.h"
 #include "xfa/fxfa/parser/xfa_resolvenode_rs.h"
@@ -423,7 +424,7 @@ class CFXJSE_FormCalcContext : public CFXJSE_HostObject {
   void GlobalPropertyGetter(CFXJSE_Value* pValue);
 
  private:
-  v8::Isolate* GetScriptRuntime() const { return m_pIsolate; }
+  v8::Isolate* GetScriptRuntime() const { return m_pIsolate.Get(); }
   CXFA_Document* GetDocument() const { return m_pDocument.Get(); }
 
   void ThrowNoDefaultPropertyException(const ByteStringView& name) const;
@@ -436,7 +437,7 @@ class CFXJSE_FormCalcContext : public CFXJSE_HostObject {
   void ThrowParamCountMismatchException(const WideString& method) const;
   void ThrowException(const wchar_t* str, ...) const;
 
-  v8::Isolate* m_pIsolate;
+  UnownedPtr<v8::Isolate> m_pIsolate;
   CFXJSE_Class* m_pFMClass;
   std::unique_ptr<CFXJSE_Value> m_pValue;
   UnownedPtr<CXFA_Document> const m_pDocument;
diff --git a/fxjs/cfxjse_runtimedata.cpp b/fxjs/cfxjse_runtimedata.cpp
index 540bcb084e..9db172dacd 100644
--- a/fxjs/cfxjse_runtimedata.cpp
+++ b/fxjs/cfxjse_runtimedata.cpp
@@ -11,15 +11,13 @@
 #include "fxjs/cfxjs_engine.h"
 #include "fxjs/cfxjse_isolatetracker.h"
 
-CFXJSE_RuntimeData::CFXJSE_RuntimeData(v8::Isolate* pIsolate)
-    : m_pIsolate(pIsolate) {}
+CFXJSE_RuntimeData::CFXJSE_RuntimeData() = default;
 
-CFXJSE_RuntimeData::~CFXJSE_RuntimeData() {}
+CFXJSE_RuntimeData::~CFXJSE_RuntimeData() = default;
 
 std::unique_ptr<CFXJSE_RuntimeData> CFXJSE_RuntimeData::Create(
     v8::Isolate* pIsolate) {
-  std::unique_ptr<CFXJSE_RuntimeData> pRuntimeData(
-      new CFXJSE_RuntimeData(pIsolate));
+  std::unique_ptr<CFXJSE_RuntimeData> pRuntimeData(new CFXJSE_RuntimeData());
   CFXJSE_ScopeUtil_IsolateHandle scope(pIsolate);
 
   v8::Local<v8::FunctionTemplate> hFuncTemplate =
diff --git a/fxjs/cfxjse_runtimedata.h b/fxjs/cfxjse_runtimedata.h
index 292fe26ae3..fd4cbd7c4e 100644
--- a/fxjs/cfxjse_runtimedata.h
+++ b/fxjs/cfxjse_runtimedata.h
@@ -9,6 +9,7 @@
 
 #include <memory>
 
+#include "core/fxcrt/unowned_ptr.h"
 #include "v8/include/v8.h"
 
 class CFXJSE_RuntimeList;
@@ -19,12 +20,11 @@ class CFXJSE_RuntimeData {
 
   static CFXJSE_RuntimeData* Get(v8::Isolate* pIsolate);
 
-  v8::Isolate* m_pIsolate;
   v8::Global<v8::FunctionTemplate> m_hRootContextGlobalTemplate;
   v8::Global<v8::Context> m_hRootContext;
 
  protected:
-  explicit CFXJSE_RuntimeData(v8::Isolate* pIsolate);
+  CFXJSE_RuntimeData();
 
   static std::unique_ptr<CFXJSE_RuntimeData> Create(v8::Isolate* pIsolate);
 
diff --git a/fxjs/cfxjse_value.cpp b/fxjs/cfxjse_value.cpp
index c1dd7b0027..5d7f885746 100644
--- a/fxjs/cfxjse_value.cpp
+++ b/fxjs/cfxjse_value.cpp
@@ -71,8 +71,9 @@ CFXJSE_Value::~CFXJSE_Value() {}
 CFXJSE_HostObject* CFXJSE_Value::ToHostObject(CFXJSE_Class* lpClass) const {
   ASSERT(!m_hValue.IsEmpty());
 
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
-  v8::Local<v8::Value> pValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
+  v8::Local<v8::Value> pValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   ASSERT(!pValue.IsEmpty());
 
   if (!pValue->IsObject())
@@ -83,51 +84,52 @@ CFXJSE_HostObject* CFXJSE_Value::ToHostObject(CFXJSE_Class* lpClass) const {
 
 void CFXJSE_Value::SetObject(CFXJSE_HostObject* lpObject,
                              CFXJSE_Class* pClass) {
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
   v8::Local<v8::FunctionTemplate> hClass =
-      v8::Local<v8::FunctionTemplate>::New(m_pIsolate, pClass->m_hTemplate);
+      v8::Local<v8::FunctionTemplate>::New(GetIsolate(), pClass->m_hTemplate);
   v8::Local<v8::Object> hObject = hClass->InstanceTemplate()->NewInstance();
   FXJSE_UpdateObjectBinding(hObject, lpObject);
-  m_hValue.Reset(m_pIsolate, hObject);
+  m_hValue.Reset(GetIsolate(), hObject);
 }
 
 void CFXJSE_Value::SetArray(
     const std::vector<std::unique_ptr<CFXJSE_Value>>& values) {
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
-  v8::Local<v8::Array> hArrayObject = v8::Array::New(m_pIsolate, values.size());
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
+  v8::Local<v8::Array> hArrayObject =
+      v8::Array::New(GetIsolate(), values.size());
   uint32_t count = 0;
   for (auto& v : values) {
     hArrayObject->Set(count++, v8::Local<v8::Value>::New(
-                                   m_pIsolate, v.get()->DirectGetValue()));
+                                   GetIsolate(), v.get()->DirectGetValue()));
   }
-  m_hValue.Reset(m_pIsolate, hArrayObject);
+  m_hValue.Reset(GetIsolate(), hArrayObject);
 }
 
 void CFXJSE_Value::SetDate(double dDouble) {
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
-  v8::Local<v8::Value> hDate = v8::Date::New(m_pIsolate, dDouble);
-  m_hValue.Reset(m_pIsolate, hDate);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
+  v8::Local<v8::Value> hDate = v8::Date::New(GetIsolate(), dDouble);
+  m_hValue.Reset(GetIsolate(), hDate);
 }
 
 void CFXJSE_Value::SetFloat(float fFloat) {
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> pValue = v8::Number::New(m_pIsolate, ftod(fFloat));
-  m_hValue.Reset(m_pIsolate, pValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> pValue = v8::Number::New(GetIsolate(), ftod(fFloat));
+  m_hValue.Reset(GetIsolate(), pValue);
 }
 
 bool CFXJSE_Value::SetObjectProperty(const ByteStringView& szPropName,
                                      CFXJSE_Value* lpPropValue) {
   ASSERT(lpPropValue);
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
   v8::Local<v8::Value> hObject =
-      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   if (!hObject->IsObject())
     return false;
 
   v8::Local<v8::Value> hPropValue =
-      v8::Local<v8::Value>::New(m_pIsolate, lpPropValue->DirectGetValue());
+      v8::Local<v8::Value>::New(GetIsolate(), lpPropValue->DirectGetValue());
   return (bool)hObject.As<v8::Object>()->Set(
-      v8::String::NewFromUtf8(m_pIsolate, szPropName.unterminated_c_str(),
+      v8::String::NewFromUtf8(GetIsolate(), szPropName.unterminated_c_str(),
                               v8::String::kNormalString,
                               szPropName.GetLength()),
       hPropValue);
@@ -136,15 +138,15 @@ bool CFXJSE_Value::SetObjectProperty(const ByteStringView& szPropName,
 bool CFXJSE_Value::GetObjectProperty(const ByteStringView& szPropName,
                                      CFXJSE_Value* lpPropValue) {
   ASSERT(lpPropValue);
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
   v8::Local<v8::Value> hObject =
-      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   if (!hObject->IsObject())
     return false;
 
   v8::Local<v8::Value> hPropValue =
       hObject.As<v8::Object>()->Get(v8::String::NewFromUtf8(
-          m_pIsolate, szPropName.unterminated_c_str(),
+          GetIsolate(), szPropName.unterminated_c_str(),
           v8::String::kNormalString, szPropName.GetLength()));
   lpPropValue->ForceSetValue(hPropValue);
   return true;
@@ -152,22 +154,22 @@ bool CFXJSE_Value::GetObjectProperty(const ByteStringView& szPropName,
 
 bool CFXJSE_Value::SetObjectProperty(uint32_t uPropIdx,
                                      CFXJSE_Value* lpPropValue) {
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
   v8::Local<v8::Value> hObject =
-      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   if (!hObject->IsObject())
     return false;
 
   v8::Local<v8::Value> hPropValue =
-      v8::Local<v8::Value>::New(m_pIsolate, lpPropValue->DirectGetValue());
+      v8::Local<v8::Value>::New(GetIsolate(), lpPropValue->DirectGetValue());
   return (bool)hObject.As<v8::Object>()->Set(uPropIdx, hPropValue);
 }
 
 bool CFXJSE_Value::GetObjectPropertyByIdx(uint32_t uPropIdx,
                                           CFXJSE_Value* lpPropValue) {
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
   v8::Local<v8::Value> hObject =
-      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   if (!hObject->IsObject())
     return false;
 
@@ -177,51 +179,51 @@ bool CFXJSE_Value::GetObjectPropertyByIdx(uint32_t uPropIdx,
 }
 
 bool CFXJSE_Value::DeleteObjectProperty(const ByteStringView& szPropName) {
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
   v8::Local<v8::Value> hObject =
-      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   if (!hObject->IsObject())
     return false;
 
   hObject.As<v8::Object>()->Delete(v8::String::NewFromUtf8(
-      m_pIsolate, szPropName.unterminated_c_str(), v8::String::kNormalString,
+      GetIsolate(), szPropName.unterminated_c_str(), v8::String::kNormalString,
       szPropName.GetLength()));
   return true;
 }
 
 bool CFXJSE_Value::HasObjectOwnProperty(const ByteStringView& szPropName,
                                         bool bUseTypeGetter) {
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
   v8::Local<v8::Value> hObject =
-      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   if (!hObject->IsObject())
     return false;
 
   v8::Local<v8::String> hKey = v8::String::NewFromUtf8(
-      m_pIsolate, szPropName.unterminated_c_str(), v8::String::kNormalString,
+      GetIsolate(), szPropName.unterminated_c_str(), v8::String::kNormalString,
       szPropName.GetLength());
   return hObject.As<v8::Object>()->HasRealNamedProperty(hKey) ||
          (bUseTypeGetter &&
           hObject.As<v8::Object>()
-              ->HasOwnProperty(m_pIsolate->GetCurrentContext(), hKey)
+              ->HasOwnProperty(GetIsolate()->GetCurrentContext(), hKey)
               .FromMaybe(false));
 }
 
 bool CFXJSE_Value::SetObjectOwnProperty(const ByteStringView& szPropName,
                                         CFXJSE_Value* lpPropValue) {
   ASSERT(lpPropValue);
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
   v8::Local<v8::Value> hObject =
-      v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   if (!hObject->IsObject())
     return false;
 
   v8::Local<v8::Value> pValue =
-      v8::Local<v8::Value>::New(m_pIsolate, lpPropValue->m_hValue);
+      v8::Local<v8::Value>::New(GetIsolate(), lpPropValue->m_hValue);
   return hObject.As<v8::Object>()
       ->DefineOwnProperty(
           m_pIsolate->GetCurrentContext(),
-          v8::String::NewFromUtf8(m_pIsolate, szPropName.unterminated_c_str(),
+          v8::String::NewFromUtf8(GetIsolate(), szPropName.unterminated_c_str(),
                                   v8::String::kNormalString,
                                   szPropName.GetLength()),
           pValue)
@@ -232,22 +234,22 @@ bool CFXJSE_Value::SetFunctionBind(CFXJSE_Value* lpOldFunction,
                                    CFXJSE_Value* lpNewThis) {
   ASSERT(lpOldFunction && lpNewThis);
 
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
   v8::Local<v8::Value> rgArgs[2];
   v8::Local<v8::Value> hOldFunction =
-      v8::Local<v8::Value>::New(m_pIsolate, lpOldFunction->DirectGetValue());
+      v8::Local<v8::Value>::New(GetIsolate(), lpOldFunction->DirectGetValue());
   if (hOldFunction.IsEmpty() || !hOldFunction->IsFunction())
     return false;
 
   rgArgs[0] = hOldFunction;
   v8::Local<v8::Value> hNewThis =
-      v8::Local<v8::Value>::New(m_pIsolate, lpNewThis->DirectGetValue());
+      v8::Local<v8::Value>::New(GetIsolate(), lpNewThis->DirectGetValue());
   if (hNewThis.IsEmpty())
     return false;
 
   rgArgs[1] = hNewThis;
   v8::Local<v8::String> hBinderFuncSource =
-      v8::String::NewFromUtf8(m_pIsolate,
+      v8::String::NewFromUtf8(GetIsolate(),
                               "(function (oldfunction, newthis) { return "
                               "oldfunction.bind(newthis); })");
   v8::Local<v8::Context> hContext = m_pIsolate->GetCurrentContext();
@@ -262,7 +264,7 @@ bool CFXJSE_Value::SetFunctionBind(CFXJSE_Value* lpOldFunction,
   if (hBoundFunction.IsEmpty() || !hBoundFunction->IsFunction())
     return false;
 
-  m_hValue.Reset(m_pIsolate, hBoundFunction);
+  m_hValue.Reset(GetIsolate(), hBoundFunction);
   return true;
 }
 
@@ -270,8 +272,9 @@ bool CFXJSE_Value::IsUndefined() const {
   if (m_hValue.IsEmpty())
     return false;
 
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return hValue->IsUndefined();
 }
 
@@ -279,8 +282,9 @@ bool CFXJSE_Value::IsNull() const {
   if (m_hValue.IsEmpty())
     return false;
 
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return hValue->IsNull();
 }
 
@@ -288,8 +292,9 @@ bool CFXJSE_Value::IsBoolean() const {
   if (m_hValue.IsEmpty())
     return false;
 
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return hValue->IsBoolean();
 }
 
@@ -297,8 +302,9 @@ bool CFXJSE_Value::IsString() const {
   if (m_hValue.IsEmpty())
     return false;
 
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return hValue->IsString();
 }
 
@@ -306,8 +312,9 @@ bool CFXJSE_Value::IsNumber() const {
   if (m_hValue.IsEmpty())
     return false;
 
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return hValue->IsNumber();
 }
 
@@ -315,8 +322,9 @@ bool CFXJSE_Value::IsInteger() const {
   if (m_hValue.IsEmpty())
     return false;
 
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return hValue->IsInt32();
 }
 
@@ -324,8 +332,9 @@ bool CFXJSE_Value::IsObject() const {
   if (m_hValue.IsEmpty())
     return false;
 
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return hValue->IsObject();
 }
 
@@ -333,8 +342,9 @@ bool CFXJSE_Value::IsArray() const {
   if (m_hValue.IsEmpty())
     return false;
 
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return hValue->IsArray();
 }
 
@@ -342,8 +352,9 @@ bool CFXJSE_Value::IsFunction() const {
   if (m_hValue.IsEmpty())
     return false;
 
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return hValue->IsFunction();
 }
 
@@ -351,83 +362,90 @@ bool CFXJSE_Value::IsDate() const {
   if (m_hValue.IsEmpty())
     return false;
 
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return hValue->IsDate();
 }
 
 bool CFXJSE_Value::ToBoolean() const {
   ASSERT(!m_hValue.IsEmpty());
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return static_cast<bool>(hValue->BooleanValue());
 }
 
 float CFXJSE_Value::ToFloat() const {
   ASSERT(!m_hValue.IsEmpty());
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return static_cast<float>(hValue->NumberValue());
 }
 
 double CFXJSE_Value::ToDouble() const {
   ASSERT(!m_hValue.IsEmpty());
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return static_cast<double>(hValue->NumberValue());
 }
 
 int32_t CFXJSE_Value::ToInteger() const {
   ASSERT(!m_hValue.IsEmpty());
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   return static_cast<int32_t>(hValue->NumberValue());
 }
 
 ByteString CFXJSE_Value::ToString() const {
   ASSERT(!m_hValue.IsEmpty());
-  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Local<v8::Value>::New(m_pIsolate, m_hValue);
+  CFXJSE_ScopeUtil_IsolateHandleRootContext scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Local<v8::Value>::New(GetIsolate(), m_hValue);
   v8::Local<v8::String> hString = hValue->ToString();
-  v8::String::Utf8Value hStringVal(m_pIsolate, hString);
+  v8::String::Utf8Value hStringVal(GetIsolate(), hString);
   return ByteString(*hStringVal);
 }
 
 void CFXJSE_Value::SetUndefined() {
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Undefined(m_pIsolate);
-  m_hValue.Reset(m_pIsolate, hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue = v8::Undefined(GetIsolate());
+  m_hValue.Reset(GetIsolate(), hValue);
 }
 
 void CFXJSE_Value::SetNull() {
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Null(m_pIsolate);
-  m_hValue.Reset(m_pIsolate, hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue = v8::Null(GetIsolate());
+  m_hValue.Reset(GetIsolate(), hValue);
 }
 
 void CFXJSE_Value::SetBoolean(bool bBoolean) {
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Boolean::New(m_pIsolate, bBoolean != false);
-  m_hValue.Reset(m_pIsolate, hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue =
+      v8::Boolean::New(GetIsolate(), bBoolean != false);
+  m_hValue.Reset(GetIsolate(), hValue);
 }
 
 void CFXJSE_Value::SetInteger(int32_t nInteger) {
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Integer::New(m_pIsolate, nInteger);
-  m_hValue.Reset(m_pIsolate, hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue = v8::Integer::New(GetIsolate(), nInteger);
+  m_hValue.Reset(GetIsolate(), hValue);
 }
 
 void CFXJSE_Value::SetDouble(double dDouble) {
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
-  v8::Local<v8::Value> hValue = v8::Number::New(m_pIsolate, dDouble);
-  m_hValue.Reset(m_pIsolate, hValue);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
+  v8::Local<v8::Value> hValue = v8::Number::New(GetIsolate(), dDouble);
+  m_hValue.Reset(GetIsolate(), hValue);
 }
 
 void CFXJSE_Value::SetString(const ByteStringView& szString) {
-  CFXJSE_ScopeUtil_IsolateHandle scope(m_pIsolate);
+  CFXJSE_ScopeUtil_IsolateHandle scope(GetIsolate());
   v8::Local<v8::Value> hValue = v8::String::NewFromUtf8(
-      m_pIsolate, reinterpret_cast<const char*>(szString.raw_str()),
+      GetIsolate(), reinterpret_cast<const char*>(szString.raw_str()),
       v8::String::kNormalString, szString.GetLength());
-  m_hValue.Reset(m_pIsolate, hValue);
+  m_hValue.Reset(GetIsolate(), hValue);
 }
 
diff --git a/fxjs/cfxjse_value.h b/fxjs/cfxjse_value.h
index 52bb036b95..5fbac4d58a 100644
--- a/fxjs/cfxjse_value.h
+++ b/fxjs/cfxjse_value.h
@@ -12,6 +12,7 @@
 
 #include "core/fxcrt/fx_string.h"
 #include "core/fxcrt/fx_system.h"
+#include "core/fxcrt/unowned_ptr.h"
 #include "fxjs/cfxjse_isolatetracker.h"
 #include "fxjs/cfxjse_runtimedata.h"
 #include "v8/include/v8.h"
@@ -69,15 +70,15 @@ class CFXJSE_Value {
                             CFXJSE_Value* lpPropValue);
   bool SetFunctionBind(CFXJSE_Value* lpOldFunction, CFXJSE_Value* lpNewThis);
 
-  v8::Isolate* GetIsolate() const { return m_pIsolate; }
+  v8::Isolate* GetIsolate() const { return m_pIsolate.Get(); }
   const v8::Global<v8::Value>& DirectGetValue() const { return m_hValue; }
   void ForceSetValue(v8::Local<v8::Value> hValue) {
-    m_hValue.Reset(m_pIsolate, hValue);
+    m_hValue.Reset(GetIsolate(), hValue);
   }
   void Assign(const CFXJSE_Value* lpValue) {
     ASSERT(lpValue);
     if (lpValue) {
-      m_hValue.Reset(m_pIsolate, lpValue->m_hValue);
+      m_hValue.Reset(GetIsolate(), lpValue->m_hValue);
     } else {
       m_hValue.Reset();
     }
@@ -91,7 +92,7 @@ class CFXJSE_Value {
   CFXJSE_Value(const CFXJSE_Value&);
   CFXJSE_Value& operator=(const CFXJSE_Value&);
 
-  v8::Isolate* m_pIsolate;
+  UnownedPtr<v8::Isolate> m_pIsolate;
   v8::Global<v8::Value> m_hValue;
 };
 
diff --git a/fxjs/cjs_runtime.cpp b/fxjs/cjs_runtime.cpp
index 96253c08bf..634c48be74 100644
--- a/fxjs/cjs_runtime.cpp
+++ b/fxjs/cjs_runtime.cpp
@@ -81,10 +81,8 @@ CJS_Runtime::CJS_Runtime(CPDFSDK_FormFillEnvironment* pFormFillEnv)
 CJS_Runtime::~CJS_Runtime() {
   NotifyObservers();
   ReleaseEngine();
-  if (m_isolateManaged) {
-    GetIsolate()->Dispose();
-    SetIsolate(nullptr);
-  }
+  if (m_isolateManaged)
+    DisposeIsolate();
 }
 
 void CJS_Runtime::DefineJSObjects() {
diff --git a/testing/js_embedder_test.cpp b/testing/js_embedder_test.cpp
index 1ca957b44f..9821a21166 100644
--- a/testing/js_embedder_test.cpp
+++ b/testing/js_embedder_test.cpp
@@ -15,15 +15,15 @@ JSEmbedderTest::~JSEmbedderTest() {}
 void JSEmbedderTest::SetUp() {
   v8::Isolate::CreateParams params;
   params.array_buffer_allocator = m_pArrayBufferAllocator.get();
-  m_pIsolate = v8::Isolate::New(params);
+  m_pIsolate.reset(v8::Isolate::New(params));
 
-  EmbedderTest::SetExternalIsolate(m_pIsolate);
+  EmbedderTest::SetExternalIsolate(isolate());
   EmbedderTest::SetUp();
 
-  v8::Isolate::Scope isolate_scope(m_pIsolate);
-  v8::HandleScope handle_scope(m_pIsolate);
-  FXJS_PerIsolateData::SetUp(m_pIsolate);
-  m_Engine = pdfium::MakeUnique<CFXJS_Engine>(m_pIsolate);
+  v8::Isolate::Scope isolate_scope(isolate());
+  v8::HandleScope handle_scope(isolate());
+  FXJS_PerIsolateData::SetUp(isolate());
+  m_Engine = pdfium::MakeUnique<CFXJS_Engine>(isolate());
   m_Engine->InitializeEngine();
 }
 
@@ -31,12 +31,7 @@ void JSEmbedderTest::TearDown() {
   m_Engine->ReleaseEngine();
   m_Engine.reset();
   EmbedderTest::TearDown();
-  m_pIsolate->Dispose();
-  m_pIsolate = nullptr;
-}
-
-v8::Isolate* JSEmbedderTest::isolate() {
-  return m_pIsolate;
+  m_pIsolate.reset();
 }
 
 v8::Local<v8::Context> JSEmbedderTest::GetV8Context() {
diff --git a/testing/js_embedder_test.h b/testing/js_embedder_test.h
index 44245e3024..089670e25b 100644
--- a/testing/js_embedder_test.h
+++ b/testing/js_embedder_test.h
@@ -7,6 +7,7 @@
 
 #include <memory>
 
+#include "core/fxcrt/unowned_ptr.h"
 #include "fxjs/cfxjs_engine.h"
 #include "testing/embedder_test.h"
 
@@ -18,13 +19,13 @@ class JSEmbedderTest : public EmbedderTest {
   void SetUp() override;
   void TearDown() override;
 
-  v8::Isolate* isolate();
+  v8::Isolate* isolate() const { return m_pIsolate.get(); }
+  CFXJS_Engine* engine() const { return m_Engine.get(); }
   v8::Local<v8::Context> GetV8Context();
-  CFXJS_Engine* engine() { return m_Engine.get(); }
 
  private:
   std::unique_ptr<CFX_V8ArrayBufferAllocator> m_pArrayBufferAllocator;
-  v8::Isolate* m_pIsolate = nullptr;
+  std::unique_ptr<v8::Isolate, CFX_V8IsolateDeleter> m_pIsolate;
   std::unique_ptr<CFXJS_Engine> m_Engine;
 };