mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-02 10:00:54 +00:00
366 lines
11 KiB
C++
366 lines
11 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsIAtom.h"
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#include "nsString.h"
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#include "jsapi.h"
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#include "nsIContent.h"
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#include "nsIDocument.h"
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#include "nsIGlobalObject.h"
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#include "nsUnicharUtils.h"
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#include "nsReadableUtils.h"
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#include "nsXBLProtoImplMethod.h"
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#include "nsJSUtils.h"
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#include "nsContentUtils.h"
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#include "nsIScriptSecurityManager.h"
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#include "nsIXPConnect.h"
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#include "xpcpublic.h"
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#include "nsXBLPrototypeBinding.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/dom/ScriptSettings.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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nsXBLProtoImplMethod::nsXBLProtoImplMethod(const char16_t* aName) :
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nsXBLProtoImplMember(aName),
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mMethod()
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{
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MOZ_COUNT_CTOR(nsXBLProtoImplMethod);
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}
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nsXBLProtoImplMethod::~nsXBLProtoImplMethod()
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{
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MOZ_COUNT_DTOR(nsXBLProtoImplMethod);
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if (!IsCompiled()) {
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delete GetUncompiledMethod();
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}
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}
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void
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nsXBLProtoImplMethod::AppendBodyText(const nsAString& aText)
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{
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NS_PRECONDITION(!IsCompiled(),
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"Must not be compiled when accessing uncompiled method");
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nsXBLUncompiledMethod* uncompiledMethod = GetUncompiledMethod();
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if (!uncompiledMethod) {
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uncompiledMethod = new nsXBLUncompiledMethod();
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if (!uncompiledMethod)
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return;
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SetUncompiledMethod(uncompiledMethod);
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}
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uncompiledMethod->AppendBodyText(aText);
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}
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void
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nsXBLProtoImplMethod::AddParameter(const nsAString& aText)
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{
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NS_PRECONDITION(!IsCompiled(),
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"Must not be compiled when accessing uncompiled method");
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if (aText.IsEmpty()) {
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NS_WARNING("Empty name attribute in xbl:parameter!");
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return;
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}
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nsXBLUncompiledMethod* uncompiledMethod = GetUncompiledMethod();
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if (!uncompiledMethod) {
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uncompiledMethod = new nsXBLUncompiledMethod();
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if (!uncompiledMethod)
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return;
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SetUncompiledMethod(uncompiledMethod);
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}
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uncompiledMethod->AddParameter(aText);
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}
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void
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nsXBLProtoImplMethod::SetLineNumber(uint32_t aLineNumber)
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{
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NS_PRECONDITION(!IsCompiled(),
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"Must not be compiled when accessing uncompiled method");
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nsXBLUncompiledMethod* uncompiledMethod = GetUncompiledMethod();
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if (!uncompiledMethod) {
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uncompiledMethod = new nsXBLUncompiledMethod();
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if (!uncompiledMethod)
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return;
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SetUncompiledMethod(uncompiledMethod);
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}
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uncompiledMethod->SetLineNumber(aLineNumber);
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}
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nsresult
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nsXBLProtoImplMethod::InstallMember(JSContext* aCx,
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JS::Handle<JSObject*> aTargetClassObject)
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{
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NS_PRECONDITION(IsCompiled(),
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"Should not be installing an uncompiled method");
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MOZ_ASSERT(js::IsObjectInContextCompartment(aTargetClassObject, aCx));
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#ifdef DEBUG
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{
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JS::Rooted<JSObject*> globalObject(aCx, JS_GetGlobalForObject(aCx, aTargetClassObject));
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MOZ_ASSERT(xpc::IsInContentXBLScope(globalObject) ||
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xpc::IsInAddonScope(globalObject) ||
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globalObject == xpc::GetXBLScope(aCx, globalObject));
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MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx) == globalObject);
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}
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#endif
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JS::Rooted<JSObject*> jsMethodObject(aCx, GetCompiledMethod());
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if (jsMethodObject) {
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nsDependentString name(mName);
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JS::Rooted<JSObject*> method(aCx, JS::CloneFunctionObject(aCx, jsMethodObject));
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NS_ENSURE_TRUE(method, NS_ERROR_OUT_OF_MEMORY);
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if (!::JS_DefineUCProperty(aCx, aTargetClassObject,
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static_cast<const char16_t*>(mName),
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name.Length(), method,
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JSPROP_ENUMERATE)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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}
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return NS_OK;
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}
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nsresult
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nsXBLProtoImplMethod::CompileMember(AutoJSAPI& jsapi, const nsString& aClassStr,
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JS::Handle<JSObject*> aClassObject)
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{
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AssertInCompilationScope();
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NS_PRECONDITION(!IsCompiled(),
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"Trying to compile an already-compiled method");
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NS_PRECONDITION(aClassObject,
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"Must have class object to compile");
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nsXBLUncompiledMethod* uncompiledMethod = GetUncompiledMethod();
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// No parameters or body was supplied, so don't install method.
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if (!uncompiledMethod) {
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// Early return after which we consider ourselves compiled.
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SetCompiledMethod(nullptr);
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return NS_OK;
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}
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// Don't install method if no name was supplied.
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if (!mName) {
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delete uncompiledMethod;
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// Early return after which we consider ourselves compiled.
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SetCompiledMethod(nullptr);
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return NS_OK;
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}
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// We have a method.
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// Allocate an array for our arguments.
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int32_t paramCount = uncompiledMethod->GetParameterCount();
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char** args = nullptr;
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if (paramCount > 0) {
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args = new char*[paramCount];
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if (!args)
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return NS_ERROR_OUT_OF_MEMORY;
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// Add our parameters to our args array.
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int32_t argPos = 0;
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for (nsXBLParameter* curr = uncompiledMethod->mParameters;
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curr;
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curr = curr->mNext) {
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args[argPos] = curr->mName;
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argPos++;
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}
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}
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// Get the body
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nsDependentString body;
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char16_t *bodyText = uncompiledMethod->mBodyText.GetText();
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if (bodyText)
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body.Rebind(bodyText);
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// Now that we have a body and args, compile the function
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// and then define it.
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NS_ConvertUTF16toUTF8 cname(mName);
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NS_ConvertUTF16toUTF8 functionUri(aClassStr);
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int32_t hash = functionUri.RFindChar('#');
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if (hash != kNotFound) {
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functionUri.Truncate(hash);
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}
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JSContext *cx = jsapi.cx();
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JSAutoCompartment ac(cx, aClassObject);
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JS::CompileOptions options(cx);
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options.setFileAndLine(functionUri.get(),
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uncompiledMethod->mBodyText.GetLineNumber())
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.setVersion(JSVERSION_LATEST);
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JS::Rooted<JSObject*> methodObject(cx);
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JS::AutoObjectVector emptyVector(cx);
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nsresult rv = nsJSUtils::CompileFunction(jsapi, emptyVector, options, cname,
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paramCount,
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const_cast<const char**>(args),
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body, methodObject.address());
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// Destroy our uncompiled method and delete our arg list.
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delete uncompiledMethod;
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delete [] args;
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if (NS_FAILED(rv)) {
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SetUncompiledMethod(nullptr);
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return rv;
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}
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SetCompiledMethod(methodObject);
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return NS_OK;
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}
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void
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nsXBLProtoImplMethod::Trace(const TraceCallbacks& aCallbacks, void *aClosure)
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{
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if (IsCompiled() && GetCompiledMethodPreserveColor()) {
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aCallbacks.Trace(&mMethod.AsHeapObject(), "mMethod", aClosure);
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}
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}
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nsresult
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nsXBLProtoImplMethod::Read(nsIObjectInputStream* aStream)
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{
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AssertInCompilationScope();
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MOZ_ASSERT(!IsCompiled() && !GetUncompiledMethod());
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AutoJSContext cx;
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JS::Rooted<JSObject*> methodObject(cx);
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nsresult rv = XBL_DeserializeFunction(aStream, &methodObject);
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if (NS_FAILED(rv)) {
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SetUncompiledMethod(nullptr);
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return rv;
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}
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SetCompiledMethod(methodObject);
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return NS_OK;
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}
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nsresult
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nsXBLProtoImplMethod::Write(nsIObjectOutputStream* aStream)
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{
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AssertInCompilationScope();
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MOZ_ASSERT(IsCompiled());
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if (GetCompiledMethodPreserveColor()) {
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nsresult rv = aStream->Write8(XBLBinding_Serialize_Method);
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NS_ENSURE_SUCCESS(rv, rv);
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rv = aStream->WriteWStringZ(mName);
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NS_ENSURE_SUCCESS(rv, rv);
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// Calling fromMarkedLocation() is safe because mMethod is traced by the
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// Trace() method above, and because its value is never changed after it has
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// been set to a compiled method.
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JS::Handle<JSObject*> method =
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JS::Handle<JSObject*>::fromMarkedLocation(mMethod.AsHeapObject().address());
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return XBL_SerializeFunction(aStream, method);
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}
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return NS_OK;
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}
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nsresult
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nsXBLProtoImplAnonymousMethod::Execute(nsIContent* aBoundElement, JSAddonId* aAddonId)
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{
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MOZ_ASSERT(aBoundElement->IsElement());
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NS_PRECONDITION(IsCompiled(), "Can't execute uncompiled method");
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if (!GetCompiledMethod()) {
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// Nothing to do here
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return NS_OK;
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}
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// Get the script context the same way
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// nsXBLProtoImpl::InstallImplementation does.
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nsIDocument* document = aBoundElement->OwnerDoc();
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nsCOMPtr<nsIGlobalObject> global =
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do_QueryInterface(document->GetInnerWindow());
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if (!global) {
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return NS_OK;
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}
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nsAutoMicroTask mt;
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// We are going to run script via JS::Call, so we need a script entry point,
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// but as this is XBL related it does not appear in the HTML spec.
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dom::AutoEntryScript aes(global, "XBL <constructor>/<destructor> invocation");
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aes.TakeOwnershipOfErrorReporting();
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JSContext* cx = aes.cx();
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JS::Rooted<JSObject*> globalObject(cx, global->GetGlobalJSObject());
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JS::Rooted<JSObject*> scopeObject(cx, xpc::GetScopeForXBLExecution(cx, globalObject, aAddonId));
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NS_ENSURE_TRUE(scopeObject, NS_ERROR_OUT_OF_MEMORY);
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JSAutoCompartment ac(cx, scopeObject);
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JS::AutoObjectVector scopeChain(cx);
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if (!nsJSUtils::GetScopeChainForElement(cx, aBoundElement->AsElement(),
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scopeChain)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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MOZ_ASSERT(scopeChain.length() != 0);
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// Clone the function object, using our scope chain (for backwards
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// compat to the days when this was an event handler).
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JS::Rooted<JSObject*> jsMethodObject(cx, GetCompiledMethod());
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JS::Rooted<JSObject*> method(cx, JS::CloneFunctionObject(cx, jsMethodObject,
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scopeChain));
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if (!method)
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return NS_ERROR_OUT_OF_MEMORY;
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// Now call the method
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// Check whether script is enabled.
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bool scriptAllowed = nsContentUtils::GetSecurityManager()->
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ScriptAllowed(js::GetGlobalForObjectCrossCompartment(method));
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if (scriptAllowed) {
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JS::Rooted<JS::Value> retval(cx);
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JS::Rooted<JS::Value> methodVal(cx, JS::ObjectValue(*method));
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// No need to check the return here as AutoEntryScript has taken ownership
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// of error reporting.
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::JS::Call(cx, scopeChain[0], methodVal, JS::HandleValueArray::empty(), &retval);
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}
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return NS_OK;
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}
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nsresult
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nsXBLProtoImplAnonymousMethod::Write(nsIObjectOutputStream* aStream,
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XBLBindingSerializeDetails aType)
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{
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AssertInCompilationScope();
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MOZ_ASSERT(IsCompiled());
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if (GetCompiledMethodPreserveColor()) {
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nsresult rv = aStream->Write8(aType);
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NS_ENSURE_SUCCESS(rv, rv);
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rv = aStream->WriteWStringZ(mName);
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NS_ENSURE_SUCCESS(rv, rv);
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// Calling fromMarkedLocation() is safe because mMethod is traced by the
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// Trace() method above, and because its value is never changed after it has
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// been set to a compiled method.
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JS::Handle<JSObject*> method =
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JS::Handle<JSObject*>::fromMarkedLocation(mMethod.AsHeapObject().address());
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rv = XBL_SerializeFunction(aStream, method);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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return NS_OK;
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}
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