C++ ExecutionContext类代码示例

inline void
getChildData(
            const XalanNode*    child,
            ExecutionContext&   executionContext,
            XalanDOMString&     data)
{
    assert(executionContext.hasPreserveOrStripSpaceConditions() == true);

    const XalanNode::NodeType   theType = child->getNodeType();

    if (theType == XalanNode::ELEMENT_NODE)
    {
        const XalanElement* const   theElementNode =
                static_cast<const XalanElement*>(child);

        DOMServices::doGetNodeData(*theElementNode, executionContext, data);
    }
    else if (theType == XalanNode::TEXT_NODE ||
             theType == XalanNode::CDATA_SECTION_NODE)
    {
        const XalanText*    theTextNode =
                static_cast<const XalanText*>(child);

        DOMServices::doGetNodeData(*theTextNode, executionContext, data);
    }
}

bool
DynamicCheckerFunctions::Install(Stream &error_stream,
                                 ExecutionContext &exe_ctx)
{
    m_valid_pointer_check.reset(new ClangUtilityFunction(g_valid_pointer_check_text,
                                                         VALID_POINTER_CHECK_NAME));
    if (!m_valid_pointer_check->Install(error_stream, exe_ctx))
        return false;
    
    Process *process = exe_ctx.GetProcessPtr();

    if (process)
    {
        ObjCLanguageRuntime *objc_language_runtime = process->GetObjCLanguageRuntime();
        
        if (objc_language_runtime)
        {
            m_objc_object_check.reset(objc_language_runtime->CreateObjectChecker(VALID_OBJC_OBJECT_CHECK_NAME));
            
            if (!m_objc_object_check->Install(error_stream, exe_ctx))
                return false;
        }
    }
        
    return true;
}

/*!
 * \brief  Return a handle to the value of the Nth argument of the primitive.
 * \param  inIndex Index of the actual primitive in the primitive tree.
 * \param  inN Number of the argument to get the index.
 * \param  ioContext A reference to the execution context.
 * \return A handle to the value of the Nth argument of the primitive.
 */
AnyType::Handle Primitive::getArgument(unsigned int inIndex, unsigned int inN, ExecutionContext& ioContext) const {
	schnaps_StackTraceBeginM();
	unsigned int lNodeIndex = getArgumentIndex(inIndex, inN, ioContext);
	AnyType::Handle outResult = ioContext.getPrimitiveTree()[lNodeIndex].mPrimitive->execute(lNodeIndex, ioContext);
	return outResult;
	schnaps_StackTraceEndM("AnyType::Handle Primitive::getArgument(unsigned int, unsigned int, SCHNAPS::Core::ExecutionContext&) const");
}

bool UnwindAssembly_x86::FirstNonPrologueInsn(
    AddressRange &func, const ExecutionContext &exe_ctx,
    Address &first_non_prologue_insn) {

  if (!func.GetBaseAddress().IsValid())
    return false;

  Target *target = exe_ctx.GetTargetPtr();
  if (target == nullptr)
    return false;

  if (m_assembly_inspection_engine == nullptr)
    return false;

  const bool prefer_file_cache = true;
  std::vector<uint8_t> function_text(func.GetByteSize());
  Status error;
  if (target->ReadMemory(func.GetBaseAddress(), prefer_file_cache,
                         function_text.data(), func.GetByteSize(),
                         error) == func.GetByteSize()) {
    size_t offset;
    if (m_assembly_inspection_engine->FindFirstNonPrologueInstruction(
            function_text.data(), func.GetByteSize(), offset)) {
      first_non_prologue_insn = func.GetBaseAddress();
      first_non_prologue_insn.Slide(offset);
    }
    return true;
  }
  return false;
}

// This is the static function
ExecutionResults 
ClangFunction::ExecuteFunction (
        ExecutionContext &exe_ctx, 
        lldb::addr_t function_address, 
        lldb::addr_t &void_arg,
        bool stop_others,
        bool try_all_threads,
        bool discard_on_error,
        uint32_t single_thread_timeout_usec,
        Stream &errors,
        lldb::addr_t *this_arg)
{
    lldb::ThreadPlanSP call_plan_sp (ClangFunction::GetThreadPlanToCallFunction (exe_ctx, 
                                                                                 function_address, 
                                                                                 void_arg, 
                                                                                 errors, 
                                                                                 stop_others, 
                                                                                 discard_on_error, 
                                                                                 this_arg));
    if (call_plan_sp == NULL)
        return eExecutionSetupError;
    
    call_plan_sp->SetPrivate(true);
    
    return exe_ctx.GetProcessRef().RunThreadPlan (exe_ctx, call_plan_sp, 
                                                  stop_others, 
                                                  try_all_threads, 
                                                  discard_on_error,
                                                  single_thread_timeout_usec, 
                                                  errors);
}  

void DatabaseTracker::forEachOpenDatabaseInPage(Page* page, std::unique_ptr<DatabaseCallback> callback)
{
    MutexLocker openDatabaseMapLock(m_openDatabaseMapGuard);
    if (!m_openDatabaseMap)
        return;
    for (auto& originMap : *m_openDatabaseMap) {
        for (auto& nameDatabaseSet : *originMap.value) {
            for (Database* database : *nameDatabaseSet.value) {
                ExecutionContext* context = database->getExecutionContext();
                ASSERT(context->isDocument());
                if (toDocument(context)->frame()->page() == page)
                    (*callback)(database);
            }
        }
    }
}

lldb::DisassemblerSP
Disassembler::DisassembleRange
(
    const ArchSpec &arch,
    const char *plugin_name,
    const char *flavor,
    const ExecutionContext &exe_ctx,
    const AddressRange &range,
    bool prefer_file_cache
)
{
    lldb::DisassemblerSP disasm_sp;
    if (range.GetByteSize() > 0 && range.GetBaseAddress().IsValid())
    {
        disasm_sp = Disassembler::FindPluginForTarget(exe_ctx.GetTargetSP(), arch, flavor, plugin_name);

        if (disasm_sp)
        {
            size_t bytes_disassembled = disasm_sp->ParseInstructions (&exe_ctx, range, NULL, prefer_file_cache);
            if (bytes_disassembled == 0)
                disasm_sp.reset();
        }
    }
    return disasm_sp;
}

/*!
 * \brief  Interpret the primitive tree.
 * \param  ioContext A reference to the execution context.
 * \return A handle to the result of the interpretation.
 * \throw  SCHNAPS::Core::AssertException if the primitive tree is empty.
 */
AnyType::Handle PrimitiveTree::interpret(ExecutionContext& ioContext) const {
	schnaps_StackTraceBeginM();
	schnaps_AssertM(empty() == false);
	ioContext.setPrimitiveTree(this);
	return (*this)[0].mPrimitive->execute(0, ioContext);
	schnaps_StackTraceEndM("SCHNAPS::Core::Atom::Handle SCHNAPS::Core::PrimitiveTree::interpret(SCHNAPS::Core::ExecutionContext&)");
}

static void
ResolveAddress (const ExecutionContext &exe_ctx,
                const Address &addr, 
                Address &resolved_addr)
{
    if (!addr.IsSectionOffset())
    {
        // If we weren't passed in a section offset address range,
        // try and resolve it to something
        Target *target = exe_ctx.GetTargetPtr();
        if (target)
        {
            if (target->GetSectionLoadList().IsEmpty())
            {
                target->GetImages().ResolveFileAddress (addr.GetOffset(), resolved_addr);
            }
            else
            {
                target->GetSectionLoadList().ResolveLoadAddress (addr.GetOffset(), resolved_addr);
            }
            // We weren't able to resolve the address, just treat it as a
            // raw address
            if (resolved_addr.IsValid())
                return;
        }
    }
    resolved_addr = addr;
}

lldb::ThreadPlanSP
ClangFunction::GetThreadPlanToCallFunction (ExecutionContext &exe_ctx, 
                                            lldb::addr_t args_addr,
                                            const EvaluateExpressionOptions &options,
                                            Stream &errors)
{
    Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_EXPRESSIONS | LIBLLDB_LOG_STEP));
    
    if (log)
        log->Printf("-- [ClangFunction::GetThreadPlanToCallFunction] Creating thread plan to call function \"%s\" --", m_name.c_str());
    
    // FIXME: Use the errors Stream for better error reporting.
    Thread *thread = exe_ctx.GetThreadPtr();
    if (thread == NULL)
    {
        errors.Printf("Can't call a function without a valid thread.");
        return NULL;
    }

    // Okay, now run the function:

    Address wrapper_address (m_jit_start_addr);
    
    lldb::addr_t args = { args_addr };
    
    lldb::ThreadPlanSP new_plan_sp (new ThreadPlanCallFunction (*thread,
                                                       wrapper_address,
                                                       CompilerType(),
                                                       args,
                                                       options));
    new_plan_sp->SetIsMasterPlan(true);
    new_plan_sp->SetOkayToDiscard (false);
    return new_plan_sp;
}

bool
ClangFunction::FetchFunctionResults (ExecutionContext &exe_ctx, lldb::addr_t args_addr, Value &ret_value)
{
    // Read the return value - it is the last field in the struct:
    // FIXME: How does clang tell us there's no return value?  We need to handle that case.
    // FIXME: Create our ThreadPlanCallFunction with the return CompilerType, and then use GetReturnValueObject
    // to fetch the value.  That way we can fetch any values we need.
    
    Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_EXPRESSIONS | LIBLLDB_LOG_STEP));
    
    if (log)
        log->Printf("-- [ClangFunction::FetchFunctionResults] Fetching function results for \"%s\"--", m_name.c_str());
    
    Process *process = exe_ctx.GetProcessPtr();
    
    if (process == NULL)
        return false;

    lldb::ProcessSP jit_process_sp(m_jit_process_wp.lock());
    
    if (process != jit_process_sp.get())
        return false;
                
    Error error;
    ret_value.GetScalar() = process->ReadUnsignedIntegerFromMemory (args_addr + m_return_offset, m_return_size, 0, error);

    if (error.Fail())
        return false;

    ret_value.SetCompilerType(m_function_return_type);
    ret_value.SetValueType(Value::eValueTypeScalar);
    return true;
}

void WorkerGlobalScopeFileSystem::webkitRequestFileSystem(WorkerGlobalScope* worker, int type, long long size, PassOwnPtr<FileSystemCallback> successCallback, PassOwnPtr<ErrorCallback> errorCallback)
{
    ExecutionContext* secureContext = worker->executionContext();
    if (!secureContext->securityOrigin()->canAccessFileSystem()) {
        DOMFileSystem::scheduleCallback(worker, errorCallback, FileError::create(FileError::SECURITY_ERR));
        return;
    }

    FileSystemType fileSystemType = static_cast<FileSystemType>(type);
    if (!DOMFileSystemBase::isValidType(fileSystemType)) {
        DOMFileSystem::scheduleCallback(worker, errorCallback, FileError::create(FileError::INVALID_MODIFICATION_ERR));
        return;
    }

    LocalFileSystem::from(worker)->requestFileSystem(worker, fileSystemType, size, FileSystemCallbacks::create(successCallback, errorCallback, worker, fileSystemType));
}

void WorkerGlobalScopeFileSystem::webkitResolveLocalFileSystemURL(WorkerGlobalScope* worker, const String& url, PassOwnPtr<EntryCallback> successCallback, PassOwnPtr<ErrorCallback> errorCallback)
{
    KURL completedURL = worker->completeURL(url);
    ExecutionContext* secureContext = worker->executionContext();
    if (!secureContext->securityOrigin()->canAccessFileSystem() || !secureContext->securityOrigin()->canRequest(completedURL)) {
        DOMFileSystem::scheduleCallback(worker, errorCallback, FileError::create(FileError::SECURITY_ERR));
        return;
    }

    if (!completedURL.isValid()) {
        DOMFileSystem::scheduleCallback(worker, errorCallback, FileError::create(FileError::ENCODING_ERR));
        return;
    }

    LocalFileSystem::from(worker)->resolveURL(worker, completedURL, ResolveURICallbacks::create(successCallback, errorCallback, worker));
}

 virtual void execute(const DOM::Node<string_type, string_adaptor>& node, 
                      ExecutionContext<string_type, string_adaptor>& context) const
 {
   ChainStackFrame<string_type, string_adaptor> frame(context);
   if(test_->evaluateAsBool(node, context.xpathContext()))
     this->execute_children(node, context);
 } // execute

static void SetupDeclVendor(ExecutionContext &exe_ctx, Target *target) {
  if (ClangModulesDeclVendor *decl_vendor =
          target->GetClangModulesDeclVendor()) {
    const ClangModulesDeclVendor::ModuleVector &hand_imported_modules =
        llvm::cast<ClangPersistentVariables>(
            target->GetPersistentExpressionStateForLanguage(
                lldb::eLanguageTypeC))
            ->GetHandLoadedClangModules();
    ClangModulesDeclVendor::ModuleVector modules_for_macros;

    for (ClangModulesDeclVendor::ModuleID module : hand_imported_modules) {
      modules_for_macros.push_back(module);
    }

    if (target->GetEnableAutoImportClangModules()) {
      if (StackFrame *frame = exe_ctx.GetFramePtr()) {
        if (Block *block = frame->GetFrameBlock()) {
          SymbolContext sc;

          block->CalculateSymbolContext(&sc);

          if (sc.comp_unit) {
            StreamString error_stream;

            decl_vendor->AddModulesForCompileUnit(
                *sc.comp_unit, modules_for_macros, error_stream);
          }
        }
      }
    }
  }
}