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      1 /*
      2  * Copyright (C) 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "bindings/v8/V8Initializer.h"
     28 
     29 #include "bindings/core/v8/V8DOMException.h"
     30 #include "bindings/core/v8/V8ErrorEvent.h"
     31 #include "bindings/core/v8/V8History.h"
     32 #include "bindings/core/v8/V8Location.h"
     33 #include "bindings/core/v8/V8Window.h"
     34 #include "bindings/v8/DOMWrapperWorld.h"
     35 #include "bindings/v8/ScriptCallStackFactory.h"
     36 #include "bindings/v8/ScriptController.h"
     37 #include "bindings/v8/ScriptProfiler.h"
     38 #include "bindings/v8/V8Binding.h"
     39 #include "bindings/v8/V8ErrorHandler.h"
     40 #include "bindings/v8/V8GCController.h"
     41 #include "bindings/v8/V8PerContextData.h"
     42 #include "core/dom/Document.h"
     43 #include "core/dom/ExceptionCode.h"
     44 #include "core/frame/ConsoleTypes.h"
     45 #include "core/frame/LocalDOMWindow.h"
     46 #include "core/frame/LocalFrame.h"
     47 #include "core/frame/csp/ContentSecurityPolicy.h"
     48 #include "core/inspector/ScriptCallStack.h"
     49 #include "platform/TraceEvent.h"
     50 #include "public/platform/Platform.h"
     51 #include "wtf/RefPtr.h"
     52 #include "wtf/text/WTFString.h"
     53 #include <v8-debug.h>
     54 
     55 namespace WebCore {
     56 
     57 static LocalFrame* findFrame(v8::Local<v8::Object> host, v8::Local<v8::Value> data, v8::Isolate* isolate)
     58 {
     59     const WrapperTypeInfo* type = WrapperTypeInfo::unwrap(data);
     60 
     61     if (V8Window::wrapperTypeInfo.equals(type)) {
     62         v8::Handle<v8::Object> windowWrapper = V8Window::findInstanceInPrototypeChain(host, isolate);
     63         if (windowWrapper.IsEmpty())
     64             return 0;
     65         return V8Window::toNative(windowWrapper)->frame();
     66     }
     67 
     68     if (V8History::wrapperTypeInfo.equals(type))
     69         return V8History::toNative(host)->frame();
     70 
     71     if (V8Location::wrapperTypeInfo.equals(type))
     72         return V8Location::toNative(host)->frame();
     73 
     74     // This function can handle only those types listed above.
     75     ASSERT_NOT_REACHED();
     76     return 0;
     77 }
     78 
     79 static void reportFatalErrorInMainThread(const char* location, const char* message)
     80 {
     81     int memoryUsageMB = blink::Platform::current()->actualMemoryUsageMB();
     82     printf("V8 error: %s (%s).  Current memory usage: %d MB\n", message, location, memoryUsageMB);
     83     CRASH();
     84 }
     85 
     86 static void messageHandlerInMainThread(v8::Handle<v8::Message> message, v8::Handle<v8::Value> data)
     87 {
     88     ASSERT(isMainThread());
     89     // It's possible that messageHandlerInMainThread() is invoked while we're initializing a window.
     90     // In that half-baked situation, we don't have a valid context nor a valid world,
     91     // so just return immediately.
     92     if (DOMWrapperWorld::windowIsBeingInitialized())
     93         return;
     94 
     95     v8::Isolate* isolate = v8::Isolate::GetCurrent();
     96     // If called during context initialization, there will be no entered window.
     97     LocalDOMWindow* enteredWindow = enteredDOMWindow(isolate);
     98     if (!enteredWindow || !enteredWindow->isCurrentlyDisplayedInFrame())
     99         return;
    100 
    101     String errorMessage = toCoreString(message->Get());
    102 
    103     v8::Handle<v8::StackTrace> stackTrace = message->GetStackTrace();
    104     RefPtrWillBeRawPtr<ScriptCallStack> callStack = nullptr;
    105     // Currently stack trace is only collected when inspector is open.
    106     if (!stackTrace.IsEmpty() && stackTrace->GetFrameCount() > 0)
    107         callStack = createScriptCallStack(stackTrace, ScriptCallStack::maxCallStackSizeToCapture, isolate);
    108 
    109     v8::Handle<v8::Value> resourceName = message->GetScriptResourceName();
    110     bool shouldUseDocumentURL = resourceName.IsEmpty() || !resourceName->IsString();
    111     String resource = shouldUseDocumentURL ? enteredWindow->document()->url() : toCoreString(resourceName.As<v8::String>());
    112     AccessControlStatus corsStatus = message->IsSharedCrossOrigin() ? SharableCrossOrigin : NotSharableCrossOrigin;
    113 
    114     ScriptState* scriptState = ScriptState::current(isolate);
    115     RefPtrWillBeRawPtr<ErrorEvent> event = ErrorEvent::create(errorMessage, resource, message->GetLineNumber(), message->GetStartColumn() + 1, &scriptState->world());
    116     if (V8DOMWrapper::isDOMWrapper(data)) {
    117         v8::Handle<v8::Object> obj = v8::Handle<v8::Object>::Cast(data);
    118         const WrapperTypeInfo* type = toWrapperTypeInfo(obj);
    119         if (V8DOMException::wrapperTypeInfo.isSubclass(type)) {
    120             DOMException* exception = V8DOMException::toNative(obj);
    121             if (exception && !exception->messageForConsole().isEmpty())
    122                 event->setUnsanitizedMessage("Uncaught " + exception->toStringForConsole());
    123         }
    124     }
    125 
    126     // This method might be called while we're creating a new context. In this case, we
    127     // avoid storing the exception object, as we can't create a wrapper during context creation.
    128     // FIXME: Can we even get here during initialization now that we bail out when GetEntered returns an empty handle?
    129     LocalFrame* frame = enteredWindow->document()->frame();
    130     if (frame && frame->script().existingWindowShell(scriptState->world())) {
    131         V8ErrorHandler::storeExceptionOnErrorEventWrapper(event.get(), data, scriptState->context()->Global(), isolate);
    132     }
    133     enteredWindow->document()->reportException(event.release(), callStack, corsStatus);
    134 }
    135 
    136 static void failedAccessCheckCallbackInMainThread(v8::Local<v8::Object> host, v8::AccessType type, v8::Local<v8::Value> data)
    137 {
    138     v8::Isolate* isolate = v8::Isolate::GetCurrent();
    139     LocalFrame* target = findFrame(host, data, isolate);
    140     if (!target)
    141         return;
    142     LocalDOMWindow* targetWindow = target->domWindow();
    143 
    144     // FIXME: We should modify V8 to pass in more contextual information (context, property, and object).
    145     ExceptionState exceptionState(ExceptionState::UnknownContext, 0, 0, isolate->GetCurrentContext()->Global(), isolate);
    146     exceptionState.throwSecurityError(targetWindow->sanitizedCrossDomainAccessErrorMessage(callingDOMWindow(isolate)), targetWindow->crossDomainAccessErrorMessage(callingDOMWindow(isolate)));
    147     exceptionState.throwIfNeeded();
    148 }
    149 
    150 static bool codeGenerationCheckCallbackInMainThread(v8::Local<v8::Context> context)
    151 {
    152     if (ExecutionContext* executionContext = toExecutionContext(context)) {
    153         if (ContentSecurityPolicy* policy = toDocument(executionContext)->contentSecurityPolicy())
    154             return policy->allowEval(ScriptState::from(context));
    155     }
    156     return false;
    157 }
    158 
    159 static void timerTraceProfilerInMainThread(const char* name, int status)
    160 {
    161     if (!status) {
    162         TRACE_EVENT_BEGIN0("V8", name);
    163     } else {
    164         TRACE_EVENT_END0("V8", name);
    165     }
    166 }
    167 
    168 static void initializeV8Common(v8::Isolate* isolate)
    169 {
    170     v8::ResourceConstraints constraints;
    171     constraints.ConfigureDefaults(static_cast<uint64_t>(blink::Platform::current()->physicalMemoryMB()) << 20, static_cast<uint32_t>(blink::Platform::current()->virtualMemoryLimitMB()) << 20, static_cast<uint32_t>(blink::Platform::current()->numberOfProcessors()));
    172     v8::SetResourceConstraints(isolate, &constraints);
    173 
    174     v8::V8::AddGCPrologueCallback(V8GCController::gcPrologue);
    175     v8::V8::AddGCEpilogueCallback(V8GCController::gcEpilogue);
    176 
    177     v8::Debug::SetLiveEditEnabled(isolate, false);
    178 
    179     isolate->SetAutorunMicrotasks(false);
    180 }
    181 
    182 void V8Initializer::initializeMainThreadIfNeeded(v8::Isolate* isolate)
    183 {
    184     ASSERT(isMainThread());
    185 
    186     static bool initialized = false;
    187     if (initialized)
    188         return;
    189     initialized = true;
    190 
    191     initializeV8Common(isolate);
    192 
    193     v8::V8::SetFatalErrorHandler(reportFatalErrorInMainThread);
    194     V8PerIsolateData::ensureInitialized(isolate);
    195     v8::V8::AddMessageListener(messageHandlerInMainThread);
    196     v8::V8::SetFailedAccessCheckCallbackFunction(failedAccessCheckCallbackInMainThread);
    197     v8::V8::SetAllowCodeGenerationFromStringsCallback(codeGenerationCheckCallbackInMainThread);
    198 
    199     isolate->SetEventLogger(timerTraceProfilerInMainThread);
    200 
    201     ScriptProfiler::initialize();
    202 }
    203 
    204 static void reportFatalErrorInWorker(const char* location, const char* message)
    205 {
    206     // FIXME: We temporarily deal with V8 internal error situations such as out-of-memory by crashing the worker.
    207     CRASH();
    208 }
    209 
    210 static void messageHandlerInWorker(v8::Handle<v8::Message> message, v8::Handle<v8::Value> data)
    211 {
    212     static bool isReportingException = false;
    213     // Exceptions that occur in error handler should be ignored since in that case
    214     // WorkerGlobalScope::reportException will send the exception to the worker object.
    215     if (isReportingException)
    216         return;
    217     isReportingException = true;
    218 
    219     v8::Isolate* isolate = v8::Isolate::GetCurrent();
    220     ScriptState* scriptState = ScriptState::current(isolate);
    221     // During the frame teardown, there may not be a valid context.
    222     if (ExecutionContext* context = scriptState->executionContext()) {
    223         String errorMessage = toCoreString(message->Get());
    224         TOSTRING_VOID(V8StringResource<>, sourceURL, message->GetScriptResourceName());
    225 
    226         RefPtrWillBeRawPtr<ErrorEvent> event = ErrorEvent::create(errorMessage, sourceURL, message->GetLineNumber(), message->GetStartColumn() + 1, &DOMWrapperWorld::current(isolate));
    227         AccessControlStatus corsStatus = message->IsSharedCrossOrigin() ? SharableCrossOrigin : NotSharableCrossOrigin;
    228 
    229         V8ErrorHandler::storeExceptionOnErrorEventWrapper(event.get(), data, scriptState->context()->Global(), isolate);
    230         context->reportException(event.release(), nullptr, corsStatus);
    231     }
    232 
    233     isReportingException = false;
    234 }
    235 
    236 static const int kWorkerMaxStackSize = 500 * 1024;
    237 
    238 void V8Initializer::initializeWorker(v8::Isolate* isolate)
    239 {
    240     initializeV8Common(isolate);
    241 
    242     v8::V8::AddMessageListener(messageHandlerInWorker);
    243     v8::V8::SetFatalErrorHandler(reportFatalErrorInWorker);
    244 
    245     v8::ResourceConstraints resourceConstraints;
    246     uint32_t here;
    247     resourceConstraints.set_stack_limit(&here - kWorkerMaxStackSize / sizeof(uint32_t*));
    248     v8::SetResourceConstraints(isolate, &resourceConstraints);
    249 }
    250 
    251 } // namespace WebCore
    252