Add m-esr52 at 52.6.0

1 files changed, 356 insertions, 0 deletions

diff --git a/dom/xbl/nsXBLProtoImplMethod.cpp b/dom/xbl/nsXBLProtoImplMethod.cpp
new file mode 100644
index 000000000..31b215ab3
--- /dev/null
+++ b/dom/xbl/nsXBLProtoImplMethod.cpp
@@ -0,0 +1,356 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIAtom.h"
+#include "nsString.h"
+#include "jsapi.h"
+#include "nsIContent.h"
+#include "nsIDocument.h"
+#include "nsIGlobalObject.h"
+#include "nsUnicharUtils.h"
+#include "nsReadableUtils.h"
+#include "nsXBLProtoImplMethod.h"
+#include "nsJSUtils.h"
+#include "nsContentUtils.h"
+#include "nsIScriptSecurityManager.h"
+#include "nsIXPConnect.h"
+#include "xpcpublic.h"
+#include "nsXBLPrototypeBinding.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/dom/ScriptSettings.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+nsXBLProtoImplMethod::nsXBLProtoImplMethod(const char16_t* aName) :
+  nsXBLProtoImplMember(aName),
+  mMethod()
+{
+  MOZ_COUNT_CTOR(nsXBLProtoImplMethod);
+}
+
+nsXBLProtoImplMethod::~nsXBLProtoImplMethod()
+{
+  MOZ_COUNT_DTOR(nsXBLProtoImplMethod);
+
+  if (!IsCompiled()) {
+    delete GetUncompiledMethod();
+  }
+}
+
+void
+nsXBLProtoImplMethod::AppendBodyText(const nsAString& aText)
+{
+  NS_PRECONDITION(!IsCompiled(),
+                  "Must not be compiled when accessing uncompiled method");
+
+  nsXBLUncompiledMethod* uncompiledMethod = GetUncompiledMethod();
+  if (!uncompiledMethod) {
+    uncompiledMethod = new nsXBLUncompiledMethod();
+    SetUncompiledMethod(uncompiledMethod);
+  }
+
+  uncompiledMethod->AppendBodyText(aText);
+}
+
+void
+nsXBLProtoImplMethod::AddParameter(const nsAString& aText)
+{
+  NS_PRECONDITION(!IsCompiled(),
+                  "Must not be compiled when accessing uncompiled method");
+
+  if (aText.IsEmpty()) {
+    NS_WARNING("Empty name attribute in xbl:parameter!");
+    return;
+  }
+
+  nsXBLUncompiledMethod* uncompiledMethod = GetUncompiledMethod();
+  if (!uncompiledMethod) {
+    uncompiledMethod = new nsXBLUncompiledMethod();
+    SetUncompiledMethod(uncompiledMethod);
+  }
+
+  uncompiledMethod->AddParameter(aText);
+}
+
+void
+nsXBLProtoImplMethod::SetLineNumber(uint32_t aLineNumber)
+{
+  NS_PRECONDITION(!IsCompiled(),
+                  "Must not be compiled when accessing uncompiled method");
+
+  nsXBLUncompiledMethod* uncompiledMethod = GetUncompiledMethod();
+  if (!uncompiledMethod) {
+    uncompiledMethod = new nsXBLUncompiledMethod();
+    SetUncompiledMethod(uncompiledMethod);
+  }
+
+  uncompiledMethod->SetLineNumber(aLineNumber);
+}
+
+nsresult
+nsXBLProtoImplMethod::InstallMember(JSContext* aCx,
+                                    JS::Handle<JSObject*> aTargetClassObject)
+{
+  NS_PRECONDITION(IsCompiled(),
+                  "Should not be installing an uncompiled method");
+  MOZ_ASSERT(js::IsObjectInContextCompartment(aTargetClassObject, aCx));
+
+#ifdef DEBUG
+  {
+    JS::Rooted<JSObject*> globalObject(aCx, JS_GetGlobalForObject(aCx, aTargetClassObject));
+    MOZ_ASSERT(xpc::IsInContentXBLScope(globalObject) ||
+               xpc::IsInAddonScope(globalObject) ||
+               globalObject == xpc::GetXBLScope(aCx, globalObject));
+    MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx) == globalObject);
+  }
+#endif
+
+  JS::Rooted<JSObject*> jsMethodObject(aCx, GetCompiledMethod());
+  if (jsMethodObject) {
+    nsDependentString name(mName);
+
+    JS::Rooted<JSObject*> method(aCx, JS::CloneFunctionObject(aCx, jsMethodObject));
+    NS_ENSURE_TRUE(method, NS_ERROR_OUT_OF_MEMORY);
+
+    if (!::JS_DefineUCProperty(aCx, aTargetClassObject,
+                               static_cast<const char16_t*>(mName),
+                               name.Length(), method,
+                               JSPROP_ENUMERATE)) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+  }
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImplMethod::CompileMember(AutoJSAPI& jsapi, const nsString& aClassStr,
+                                    JS::Handle<JSObject*> aClassObject)
+{
+  AssertInCompilationScope();
+  NS_PRECONDITION(!IsCompiled(),
+                  "Trying to compile an already-compiled method");
+  NS_PRECONDITION(aClassObject,
+                  "Must have class object to compile");
+
+  nsXBLUncompiledMethod* uncompiledMethod = GetUncompiledMethod();
+
+  // No parameters or body was supplied, so don't install method.
+  if (!uncompiledMethod) {
+    // Early return after which we consider ourselves compiled.
+    SetCompiledMethod(nullptr);
+
+    return NS_OK;
+  }
+
+  // Don't install method if no name was supplied.
+  if (!mName) {
+    delete uncompiledMethod;
+
+    // Early return after which we consider ourselves compiled.
+    SetCompiledMethod(nullptr);
+
+    return NS_OK;
+  }
+
+  // We have a method.
+  // Allocate an array for our arguments.
+  int32_t paramCount = uncompiledMethod->GetParameterCount();
+  char** args = nullptr;
+  if (paramCount > 0) {
+    args = new char*[paramCount];
+
+    // Add our parameters to our args array.
+    int32_t argPos = 0;
+    for (nsXBLParameter* curr = uncompiledMethod->mParameters;
+         curr;
+         curr = curr->mNext) {
+      args[argPos] = curr->mName;
+      argPos++;
+    }
+  }
+
+  // Get the body
+  nsDependentString body;
+  char16_t *bodyText = uncompiledMethod->mBodyText.GetText();
+  if (bodyText)
+    body.Rebind(bodyText);
+
+  // Now that we have a body and args, compile the function
+  // and then define it.
+  NS_ConvertUTF16toUTF8 cname(mName);
+  NS_ConvertUTF16toUTF8 functionUri(aClassStr);
+  int32_t hash = functionUri.RFindChar('#');
+  if (hash != kNotFound) {
+    functionUri.Truncate(hash);
+  }
+
+  JSContext *cx = jsapi.cx();
+  JSAutoCompartment ac(cx, aClassObject);
+  JS::CompileOptions options(cx);
+  options.setFileAndLine(functionUri.get(),
+                         uncompiledMethod->mBodyText.GetLineNumber())
+         .setVersion(JSVERSION_LATEST);
+  JS::Rooted<JSObject*> methodObject(cx);
+  JS::AutoObjectVector emptyVector(cx);
+  nsresult rv = nsJSUtils::CompileFunction(jsapi, emptyVector, options, cname,
+                                           paramCount,
+                                           const_cast<const char**>(args),
+                                           body, methodObject.address());
+
+  // Destroy our uncompiled method and delete our arg list.
+  delete uncompiledMethod;
+  delete [] args;
+  if (NS_FAILED(rv)) {
+    SetUncompiledMethod(nullptr);
+    return rv;
+  }
+
+  SetCompiledMethod(methodObject);
+
+  return NS_OK;
+}
+
+void
+nsXBLProtoImplMethod::Trace(const TraceCallbacks& aCallbacks, void *aClosure)
+{
+  if (IsCompiled() && GetCompiledMethodPreserveColor()) {
+    aCallbacks.Trace(&mMethod.AsHeapObject(), "mMethod", aClosure);
+  }
+}
+
+nsresult
+nsXBLProtoImplMethod::Read(nsIObjectInputStream* aStream)
+{
+  AssertInCompilationScope();
+  MOZ_ASSERT(!IsCompiled() && !GetUncompiledMethod());
+
+  AutoJSContext cx;
+  JS::Rooted<JSObject*> methodObject(cx);
+  nsresult rv = XBL_DeserializeFunction(aStream, &methodObject);
+  if (NS_FAILED(rv)) {
+    SetUncompiledMethod(nullptr);
+    return rv;
+  }
+
+  SetCompiledMethod(methodObject);
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImplMethod::Write(nsIObjectOutputStream* aStream)
+{
+  AssertInCompilationScope();
+  MOZ_ASSERT(IsCompiled());
+  if (GetCompiledMethodPreserveColor()) {
+    nsresult rv = aStream->Write8(XBLBinding_Serialize_Method);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = aStream->WriteWStringZ(mName);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    JS::Rooted<JSObject*> method(RootingCx(), GetCompiledMethod());
+    return XBL_SerializeFunction(aStream, method);
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImplAnonymousMethod::Execute(nsIContent* aBoundElement, JSAddonId* aAddonId)
+{
+  MOZ_ASSERT(aBoundElement->IsElement());
+  NS_PRECONDITION(IsCompiled(), "Can't execute uncompiled method");
+
+  if (!GetCompiledMethod()) {
+    // Nothing to do here
+    return NS_OK;
+  }
+
+  // Get the script context the same way
+  // nsXBLProtoImpl::InstallImplementation does.
+  nsIDocument* document = aBoundElement->OwnerDoc();
+
+  nsCOMPtr<nsIGlobalObject> global =
+    do_QueryInterface(document->GetInnerWindow());
+  if (!global) {
+    return NS_OK;
+  }
+
+  nsAutoMicroTask mt;
+
+  // We are going to run script via JS::Call, so we need a script entry point,
+  // but as this is XBL related it does not appear in the HTML spec.
+  // We need an actual JSContext to do GetScopeForXBLExecution, and it needs to
+  // be in the compartment of globalObject.  But we want our XBL execution scope
+  // to be our entry global.
+  AutoJSAPI jsapi;
+  if (!jsapi.Init(global)) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  JS::Rooted<JSObject*> globalObject(jsapi.cx(), global->GetGlobalJSObject());
+
+  JS::Rooted<JSObject*> scopeObject(jsapi.cx(),
+    xpc::GetScopeForXBLExecution(jsapi.cx(), globalObject, aAddonId));
+  NS_ENSURE_TRUE(scopeObject, NS_ERROR_OUT_OF_MEMORY);
+
+  dom::AutoEntryScript aes(scopeObject,
+                           "XBL <constructor>/<destructor> invocation",
+                           true);
+  JSContext* cx = aes.cx();
+  JS::AutoObjectVector scopeChain(cx);
+  if (!nsJSUtils::GetScopeChainForElement(cx, aBoundElement->AsElement(),
+                                          scopeChain)) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  MOZ_ASSERT(scopeChain.length() != 0);
+
+  // Clone the function object, using our scope chain (for backwards
+  // compat to the days when this was an event handler).
+  JS::Rooted<JSObject*> jsMethodObject(cx, GetCompiledMethod());
+  JS::Rooted<JSObject*> method(cx, JS::CloneFunctionObject(cx, jsMethodObject,
+                                                           scopeChain));
+  if (!method)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  // Now call the method
+
+  // Check whether script is enabled.
+  bool scriptAllowed = xpc::Scriptability::Get(method).Allowed();
+
+  if (scriptAllowed) {
+    JS::Rooted<JS::Value> retval(cx);
+    JS::Rooted<JS::Value> methodVal(cx, JS::ObjectValue(*method));
+    // No need to check the return here as AutoEntryScript has taken ownership
+    // of error reporting.
+    ::JS::Call(cx, scopeChain[0], methodVal, JS::HandleValueArray::empty(), &retval);
+  }
+
+  return NS_OK;
+}
+
+nsresult
+nsXBLProtoImplAnonymousMethod::Write(nsIObjectOutputStream* aStream,
+                                     XBLBindingSerializeDetails aType)
+{
+  AssertInCompilationScope();
+  MOZ_ASSERT(IsCompiled());
+  if (GetCompiledMethodPreserveColor()) {
+    nsresult rv = aStream->Write8(aType);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = aStream->WriteWStringZ(mName);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    JS::Rooted<JSObject*> method(RootingCx(), GetCompiledMethod());
+    rv = XBL_SerializeFunction(aStream, method);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return NS_OK;
+}