From 9a817f092e6800e9338b41acf4ea0416b6ad4467 Mon Sep 17 00:00:00 2001
From: Tom Sepez <tsepez@chromium.org>
Date: Mon, 14 Sep 2015 14:32:33 -0700
Subject: Get CJS_RuntimeFactory out of the CJS_GlobalData management business.

First part of getting rid of CJS_RuntimeFactory.  The factory design
pattern isn't appropriate here since we only ever make one kind of
object.

CJS_GlobalData is now perfectly capable of managing itself through
internal ref counts. I'm philosophically opposed to keeping ref-counts
outside the object (do you hear me std::shared_ptr, you're bad!)

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1338993005 .
---
 fpdfsdk/src/javascript/JS_GlobalData.cpp | 39 ++++++++++++++++++--------------
 fpdfsdk/src/javascript/JS_Runtime.cpp    | 20 ----------------
 fpdfsdk/src/javascript/global.cpp        |  4 ++--
 3 files changed, 24 insertions(+), 39 deletions(-)

(limited to 'fpdfsdk/src/javascript')

diff --git a/fpdfsdk/src/javascript/JS_GlobalData.cpp b/fpdfsdk/src/javascript/JS_GlobalData.cpp
index 0a21a9253c..807491854a 100644
--- a/fpdfsdk/src/javascript/JS_GlobalData.cpp
+++ b/fpdfsdk/src/javascript/JS_GlobalData.cpp
@@ -99,19 +99,31 @@ static const uint8_t JS_RC4KEY[] = {
     0x0e, 0xd0, 0x6b, 0xbb, 0xd5, 0x75, 0x55, 0x8b, 0x6e, 0x6b, 0x19, 0xa0,
     0xf8, 0x77, 0xd5, 0xa3};
 
-CJS_GlobalData::CJS_GlobalData(CPDFDoc_Environment* pApp) {
-  //  IBaseAnnot* pBaseAnnot = IBaseAnnot::GetBaseAnnot(m_pApp);
-  //  ASSERT(pBaseAnnot != NULL);
-  //
-  //  m_sFilePath = pBaseAnnot->GetUserPath();
-  m_sFilePath += SDK_JS_GLOBALDATA_FILENAME;
+CJS_GlobalData* CJS_GlobalData::g_Instance = nullptr;
+
+// static
+CJS_GlobalData* CJS_GlobalData::GetRetainedInstance(CPDFDoc_Environment* pApp) {
+  if (!g_Instance) {
+    g_Instance = new CJS_GlobalData(pApp);
+  }
+  ++g_Instance->m_RefCount;
+  return g_Instance;
+}
 
+void CJS_GlobalData::Release() {
+  if (!--m_RefCount) {
+    delete g_Instance;
+    g_Instance = nullptr;
+  }
+}
+
+CJS_GlobalData::CJS_GlobalData(CPDFDoc_Environment* pApp) : m_RefCount(0) {
+  m_sFilePath += SDK_JS_GLOBALDATA_FILENAME;
   LoadGlobalPersistentVariables();
 }
 
 CJS_GlobalData::~CJS_GlobalData() {
   SaveGlobalPersisitentVariables();
-
   for (int i = 0, sz = m_arrayGlobalData.GetSize(); i < sz; i++)
     delete m_arrayGlobalData.GetAt(i);
 
@@ -119,19 +131,12 @@ CJS_GlobalData::~CJS_GlobalData() {
 }
 
 int CJS_GlobalData::FindGlobalVariable(const FX_CHAR* propname) {
-  ASSERT(propname != NULL);
-
-  int nRet = -1;
-
   for (int i = 0, sz = m_arrayGlobalData.GetSize(); i < sz; i++) {
     CJS_GlobalData_Element* pTemp = m_arrayGlobalData.GetAt(i);
-    if (pTemp->data.sKey[0] == *propname && pTemp->data.sKey == propname) {
-      nRet = i;
-      break;
-    }
+    if (pTemp->data.sKey[0] == *propname && pTemp->data.sKey == propname)
+      return i;
   }
-
-  return nRet;
+  return -1;
 }
 
 CJS_GlobalData_Element* CJS_GlobalData::GetGlobalVariable(
diff --git a/fpdfsdk/src/javascript/JS_Runtime.cpp b/fpdfsdk/src/javascript/JS_Runtime.cpp
index 4b18d80f6c..8ba7e81654 100644
--- a/fpdfsdk/src/javascript/JS_Runtime.cpp
+++ b/fpdfsdk/src/javascript/JS_Runtime.cpp
@@ -50,7 +50,6 @@ void CJS_RuntimeFactory::Release() {
     // to do.Should be implemented as atom manipulation.
     if (--m_nRef == 0) {
       JS_Release();
-      ReleaseGlobalData();
       m_bInit = FALSE;
     }
   }
@@ -60,25 +59,6 @@ void CJS_RuntimeFactory::DeleteJSRuntime(IFXJS_Runtime* pRuntime) {
   delete (CJS_Runtime*)pRuntime;
 }
 
-CJS_GlobalData* CJS_RuntimeFactory::NewGlobalData(CPDFDoc_Environment* pApp) {
-  if (m_pGlobalData) {
-    m_nGlobalDataCount++;
-    return m_pGlobalData;
-  }
-  m_nGlobalDataCount = 1;
-  m_pGlobalData = new CJS_GlobalData(pApp);
-  return m_pGlobalData;
-}
-
-void CJS_RuntimeFactory::ReleaseGlobalData() {
-  m_nGlobalDataCount--;
-
-  if (m_nGlobalDataCount <= 0) {
-    delete m_pGlobalData;
-    m_pGlobalData = NULL;
-  }
-}
-
 void* CJS_ArrayBufferAllocator::Allocate(size_t length) {
   return calloc(1, length);
 }
diff --git a/fpdfsdk/src/javascript/global.cpp b/fpdfsdk/src/javascript/global.cpp
index bde4e7d5ae..e75dbd5585 100644
--- a/fpdfsdk/src/javascript/global.cpp
+++ b/fpdfsdk/src/javascript/global.cpp
@@ -108,12 +108,12 @@ JSGlobalAlternate::JSGlobalAlternate(CJS_Object* pJSObject)
 
 JSGlobalAlternate::~JSGlobalAlternate() {
   DestroyGlobalPersisitentVariables();
-  m_pApp->GetRuntimeFactory()->ReleaseGlobalData();
+  m_pGlobalData->Release();
 }
 
 void JSGlobalAlternate::Initial(CPDFDoc_Environment* pApp) {
   m_pApp = pApp;
-  m_pGlobalData = pApp->GetRuntimeFactory()->NewGlobalData(pApp);
+  m_pGlobalData = CJS_GlobalData::GetRetainedInstance(pApp);
   UpdateGlobalPersistentVariables();
 }
 
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