Bug 1359245 - Eliminate some XPCJSContext::Get() usage (r=mccr8)

XPCJSContext::Get() now does a TLS lookup, which is a little more expensive
than looking up a global variable. This patch removes as many of the TLS
lookups as possible.

MozReview-Commit-ID: GsqzJn55Lya

dom/base/nsDOMClassInfo.cpp

@@ -1633,7 +1633,7 @@ nsWindowSH::GlobalResolve(nsGlobalWindow *aWin, JSContext *cx,
                           JS::Handle<JSObject*> obj, JS::Handle<jsid> id,
                           JS::MutableHandle<JS::PropertyDescriptor> desc)
 {
-  if (id == XPCJSContext::Get()->GetStringID(XPCJSContext::IDX_COMPONENTS)) {
+  if (id == XPCJSRuntime::Get()->GetStringID(XPCJSContext::IDX_COMPONENTS)) {
     return LookupComponentsShim(cx, obj, aWin->AsInner(), desc);
   }
 
@@ -1641,7 +1641,7 @@ nsWindowSH::GlobalResolve(nsGlobalWindow *aWin, JSContext *cx,
   // Note: We use |obj| rather than |aWin| to get the principal here, because
   // this is called during Window setup when the Document isn't necessarily
   // hooked up yet.
-  if (id == XPCJSContext::Get()->GetStringID(XPCJSContext::IDX_CONTROLLERS) &&
+  if (id == XPCJSRuntime::Get()->GetStringID(XPCJSContext::IDX_CONTROLLERS) &&
       !xpc::IsXrayWrapper(obj) &&
       !nsContentUtils::IsSystemPrincipal(nsContentUtils::ObjectPrincipal(obj)))
   {

dom/base/nsGlobalWindow.cpp

@@ -5058,11 +5058,11 @@ nsGlobalWindow::MayResolve(jsid aId)
     return false;
   }
 
-  if (aId == XPCJSContext::Get()->GetStringID(XPCJSContext::IDX_COMPONENTS)) {
+  if (aId == XPCJSRuntime::Get()->GetStringID(XPCJSContext::IDX_COMPONENTS)) {
     return true;
   }
 
-  if (aId == XPCJSContext::Get()->GetStringID(XPCJSContext::IDX_CONTROLLERS)) {
+  if (aId == XPCJSRuntime::Get()->GetStringID(XPCJSContext::IDX_CONTROLLERS)) {
     // We only resolve .controllers in release builds and on non-chrome windows,
     // but let's not worry about any of that stuff.
     return true;

js/xpconnect/src/Sandbox.cpp

@@ -487,7 +487,7 @@ sandbox_addProperty(JSContext* cx, HandleObject obj, HandleId id, HandleValue v)
     // Whenever JS_EnumerateStandardClasses is called, it defines the
     // "undefined" property, even if it's already defined. We don't want to do
     // anything in that case.
-    if (id == XPCJSContext::Get()->GetStringID(XPCJSContext::IDX_UNDEFINED))
+    if (id == XPCJSRuntime::Get()->GetStringID(XPCJSContext::IDX_UNDEFINED))
         return true;
 
     // Avoid recursively triggering sandbox_addProperty in the

js/xpconnect/src/XPCInlines.h

@@ -186,28 +186,28 @@ inline jsid
 XPCCallContext::GetResolveName() const
 {
     CHECK_STATE(HAVE_CONTEXT);
-    return XPCJSContext::Get()->GetResolveName();
+    return GetContext()->GetResolveName();
 }
 
 inline jsid
 XPCCallContext::SetResolveName(JS::HandleId name)
 {
     CHECK_STATE(HAVE_CONTEXT);
-    return XPCJSContext::Get()->SetResolveName(name);
+    return GetContext()->SetResolveName(name);
 }
 
 inline XPCWrappedNative*
 XPCCallContext::GetResolvingWrapper() const
 {
     CHECK_STATE(HAVE_OBJECT);
-    return XPCJSContext::Get()->GetResolvingWrapper();
+    return GetContext()->GetResolvingWrapper();
 }
 
 inline XPCWrappedNative*
 XPCCallContext::SetResolvingWrapper(XPCWrappedNative* w)
 {
     CHECK_STATE(HAVE_OBJECT);
-    return XPCJSContext::Get()->SetResolvingWrapper(w);
+    return GetContext()->SetResolvingWrapper(w);
 }
 
 inline uint16_t
@@ -522,8 +522,8 @@ xpc_ForcePropertyResolve(JSContext* cx, JS::HandleObject obj, jsid idArg)
 inline jsid
 GetJSIDByIndex(JSContext* cx, unsigned index)
 {
-  XPCJSContext* xpcx = nsXPConnect::XPConnect()->GetContext();
-  return xpcx->GetStringID(index);
+    XPCJSRuntime* xpcrt = nsXPConnect::GetRuntimeInstance();
+    return xpcrt->GetStringID(index);
 }
 
 inline

js/xpconnect/src/XPCJSContext.cpp

@@ -844,7 +844,7 @@ XPCJSContext::BeforeProcessTask(bool aMightBlock)
 
     // As we may be entering a nested event loop, we need to
     // cancel any ongoing performance measurement.
-    js::ResetPerformanceMonitoring(Get()->Context());
+    js::ResetPerformanceMonitoring(Context());
 
     CycleCollectedJSContext::BeforeProcessTask(aMightBlock);
 }
@@ -864,7 +864,7 @@ XPCJSContext::AfterProcessTask(uint32_t aNewRecursionDepth)
 
     // Now that we are certain that the event is complete,
     // we can flush any ongoing performance measurement.
-    js::FlushPerformanceMonitoring(Get()->Context());
+    js::FlushPerformanceMonitoring(Context());
 
     mozilla::jsipc::AfterProcessTask();
 }

js/xpconnect/src/XPCWrappedJSClass.cpp

@@ -781,7 +781,7 @@ nsXPCWrappedJSClass::CheckForException(XPCCallContext & ccx,
     nsCOMPtr<nsIException> xpc_exception = aSyntheticException;
     /* this one would be set by our error reporter */
 
-    XPCJSContext* xpccx = XPCJSContext::Get();
+    XPCJSContext* xpccx = ccx.GetContext();
 
     // Get this right away in case we do something below to cause JS code
     // to run.
@@ -988,7 +988,7 @@ nsXPCWrappedJSClass::CallMethod(nsXPCWrappedJS* wrapper, uint16_t methodIndex,
     AutoValueVector args(cx);
     AutoScriptEvaluate scriptEval(cx);
 
-    XPCJSContext* xpccx = XPCJSContext::Get();
+    XPCJSContext* xpccx = ccx.GetContext();
     AutoSavePendingResult apr(xpccx);
 
     // XXX ASSUMES that retval is last arg. The xpidl compiler ensures this.
@@ -1236,7 +1236,7 @@ pre_call_clean_up:
         return CheckForException(ccx, aes, name, GetInterfaceName(),
                                  syntheticException);
 
-    XPCJSContext::Get()->SetPendingException(nullptr); // XXX necessary?
+    xpccx->SetPendingException(nullptr); // XXX necessary?
 
     // convert out args and result
     // NOTE: this is the total number of native params, not just the args

js/xpconnect/src/XPCWrappedNative.cpp

@@ -1287,7 +1287,7 @@ CallMethodHelper::Call()
 {
     mCallContext.SetRetVal(JS::UndefinedValue());
 
-    XPCJSContext::Get()->SetPendingException(nullptr);
+    mCallContext.GetContext()->SetPendingException(nullptr);
 
     if (mVTableIndex == 0) {
         return QueryInterfaceFastPath();

js/xpconnect/src/nsXPConnect.cpp

@@ -398,7 +398,7 @@ nsXPConnect::GetInfoForName(const char * name, nsIInterfaceInfo** info)
 NS_IMETHODIMP
 nsXPConnect::GarbageCollect(uint32_t reason)
 {
-    GetContext()->GarbageCollect(reason);
+    mRuntime->GarbageCollect(reason);
     return NS_OK;
 }
 

js/xpconnect/src/xpcprivate.h

@@ -75,6 +75,7 @@
 #include "mozilla/Attributes.h"
 #include "mozilla/CycleCollectedJSContext.h"
 #include "mozilla/CycleCollectedJSRuntime.h"
+#include "mozilla/DebugOnly.h"
 #include "mozilla/GuardObjects.h"
 #include "mozilla/Maybe.h"
 #include "mozilla/MemoryReporting.h"
@@ -2494,24 +2495,25 @@ class MOZ_RAII AutoResolveName
 {
 public:
     AutoResolveName(XPCCallContext& ccx, JS::HandleId name
-                    MOZ_GUARD_OBJECT_NOTIFIER_PARAM) :
-          mOld(ccx, XPCJSContext::Get()->SetResolveName(name))
+                    MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
+        : mContext(ccx.GetContext())
+        , mOld(ccx, mContext->SetResolveName(name))
 #ifdef DEBUG
-          ,mCheck(ccx, name)
+        , mCheck(ccx, name)
 #endif
     {
         MOZ_GUARD_OBJECT_NOTIFIER_INIT;
     }
+
     ~AutoResolveName()
-        {
-#ifdef DEBUG
-            jsid old =
-#endif
-            XPCJSContext::Get()->SetResolveName(mOld);
-            MOZ_ASSERT(old == mCheck, "Bad Nesting!");
-        }
+    {
+        mozilla::DebugOnly<jsid> old =
+            mContext->SetResolveName(mOld);
+        MOZ_ASSERT(old == mCheck, "Bad Nesting!");
+    }
 
 private:
+    XPCJSContext* mContext;
     JS::RootedId mOld;
 #ifdef DEBUG
     JS::RootedId mCheck;