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鸿蒙JS UI子系统启动结合源码分析_acelite is running in snapshot mode
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源码目录结构简单介绍：
OpenHarmony/
├── applications # 应用程序样例
├── base # 基础软件服务子系统集
├── docs
├── domains # 增强软件服务子系统集
├── drivers # 驱动子系统
├── foundation # 系统基础能力子系统集
│ ├── aafwk # Ability 框架
│ ├── ace # JS UI 框架
│ │ ├── ace_engine # ACE 1.0, 仓库名: ace_ace_engine
│ │ └── ace_engine_lite # ACE 2.0, 仓库名: ace_engine_lite
│ ├── appexecfwk # 用户程序框架和包管理模块
│ └── graphic # 图形库相关的子系统
├── interface
│ └── sdk-js # JS API 的 TS 类型文件
├── kernel # LiteOS 内核
│ ├── liteos_a
│ └── liteos_m
├── test
└── third_party
首先调用StartJSApp进入启动js ui子系统的入口函数，后面直接根据该函数分析。
StartJSApp()
StartAbility(&want)
OHOS::AbilityMsClient::GetInstance().StartAbility(want);
//对应路径foundation/aafwk/aafwk_lite/frameworks/abilitymgr_lite/src/slite/ability_manager.cpp
AbilityMsClient类的单例，成员函数StartAbility，该方法的实现
int AbilityMsClient::StartAbility(const Want *want) const
//对应路径foundation/aafwk/aafwk_lite/frameworks/abilitymgr_lite/src/slite/abilityms_slite_client.cpp
Request request = {
.msgId = START_ABILITY,
.len = 0,
.data = nullptr,
.msgValue = 0,
};
SAMGR_SendRequest(service->GetIdentity(), &request, nullptr);
BOOL AbilityMgrService::ServiceMessageHandle(Service *service, Request *request)
//对应路径 foundation/aafwk/aafwk_lite/services/abilitymgr_lite/src/ability_mgr_service.cpp
if (request->msgId == START_ABILITY)
ret = AbilityService::GetInstance().StartAbility(AbilityService::GetInstance().want_);
//对应的处理如下所示
class AbilityService : public NoCopyable
//对应方法的实现路径 foundation/aafwk/aafwk_lite/services/abilitymgr_lite/src/ability_service.cpp
int32_t AbilityService::StartAbility(AbilitySvcInfo *info)
HILOG_INFO(HILOG_MODULE_AAFWK, "StartAbility");//对应log abilityms: StartAbility
PreCheckStartAbility(info->bundleName, info->path, info->data, info->dataLength);
if (pendingToken_ == 0 && CreateAppTask(record) != ERR_OK)
int32_t AbilityService::CreateAppTask(AbilityRecord *record)
HILOG_INFO(HILOG_MODULE_AAFWK, "CreateAppTask.");
//对应的打印abilityms: CreateAppTask.
stTskInitParam.pfnTaskEntry = (TSK_ENTRY_FUNC)(JsAppHost::JsAppTaskHandler);
stTskInitParam.uwStackSize = TASK_STACK_SIZE;
stTskInitParam.usTaskPrio = OS_TASK_PRIORITY_LOWEST - APP_TASK_PRI;
stTskInitParam.pcName = const_cast<char *>("AppTask");
stTskInitParam.uwResved = 0;
auto jsAppHost = new JsAppHost();
stTskInitParam.uwArg = reinterpret_cast<UINT32>((uintptr_t)jsAppHost);
UINT32 res = LOS_TaskCreate(&appTaskId, &stTskInitParam);
void JsAppHost::JsAppTaskHandler(uint32_t uwArg)
switch ((uint32_t)innerMsg.msgId //该消息是由 SchedulerLifecycleInner 发送过来的
case ACTIVE:
jsappHost->OnActive(innerMsg.token, innerMsg.bundleName, innerMsg.path);
void JsAppHost::OnActive(uint16_t token, const char *bundleName, const char *path)
//路径 foundation/aafwk/aafwk_lite/services/abilitymgr_lite/src/js_app_host.cpp
jsAbility_->Launch(const_cast<char *>(path), bundleName, token);
void JSAbility::Launch(const char *const abilityPath,
const char *const bundleName,
uint16_t token,
const char *pageInfo)
//# JS UI 框架
//路径 foundation/ace/ace_engine_lite/frameworks/src/core/context/js_ability.cpp
HILOG_INFO(HILOG_MODULE_ACE, "LIFECYCLE: JS Ability is launching");
//对应打印Graphic: LIFECYCLE: JS Ability is launching
DumpNativeMemoryUsage();
HILOG_DEBUG(HILOG_MODULE_ACE, "available free size: %{public}d", memInfo.freeSize);
//对应log:D 03900/Graphic: available free size: 872478416
jsAbilityImpl_ = new JSAbilityImpl();
//类型转换成对象指针
JSAbilityImpl *jsAbilityImpl = CastAbilityImpl(jsAbilityImpl_);
jsAbilityImpl->InitEnvironment(abilityPath, bundleName, token);
void JSAbilityImpl::InitEnvironment(const char * const abilityPath, const char * const bundleName, uint16_t token)
//路径 foundation/ace/ace_engine_lite/frameworks/src/core/context/js_ability_impl.cpp
// init engine && js fwk
JsAppEnvironment *appJsEnv = JsAppEnvironment::GetInstance();
appJsEnv->InitRuntimeMode();
void JsAppEnvironment::InitRuntimeMode()
//路径 foundation/ace/ace_engine_lite/frameworks/src/core/context/js_app_environment.cpp
HILOG_DEBUG(HILOG_MODULE_ACE, "ACELite is running in snapshot mode");
//对应logD 03900/ACE: ACELite is running in snapshot mode
appJsEnv->InitJsFramework();
LoadFramework();
void JsAppEnvironment::LoadFramework() const
HILOG_INFO(HILOG_MODULE_ACE, "Success to load JavaScript framework.")
//对应打印 ACE: Success to load JavaScript framework.
abilityModel_ = appContext_->Eval(fileFullPath, strlen(fileFullPath), true); // generate global.$app js object
jerry_value_t JsAppContext::Eval(char *fullPath, size_t fullPathLength, bool isAppEval) const
//路径 foundation/ace/ace_engine_lite/frameworks/src/core/context/js_app_context.cpp
HILOG_ERROR(HILOG_MODULE_ACE, "JS mode changed unexpected [%{public}d]", isSnapshotMode);
jsCode = ReadFile(fullPath, outLength, isSnapshotMode);
char *ReadFile(const char * const fullPath, uint32_t &fileSize, const bool binary)
//路径 foundation/ace/ace_engine_lite/frameworks/src/core/base/js_fwk_common.cpp
jsAbilityImpl->DeliverCreate(pageInfo);
InvokeOnCreate();
void JSAbilityImpl::InvokeOnCreate() const
//路径 foundation/ace/ace_engine_lite/frameworks/src/core/context/js_ability_impl.cpp
jerry_value_t onCreateFunction = jerryx_get_property_str(abilityModel_, ABILITY_LIFECYCLE_CALLBACK_ON_CREATE); //？？
//其中 constexpr char ABILITY_LIFECYCLE_CALLBACK_ON_CREATE[] = "onCreate";
jsAbility_->Show();
void JSAbility::Show()
JSAbilityImpl *jsAbilityImpl = CastAbilityImpl(jsAbilityImpl_);
jsAbilityImpl->Show();
void JSAbilityImpl::Show() const
//路径 foundation/ace/ace_engine_lite/frameworks/src/core/context/js_ability_impl.cpp
router_->Show();
void Router::Show()
//路径 foundation/ace/ace_engine_lite/frameworks/src/core/router/js_router.cpp
currentSm_->SetHiddenFlag(hidden_);//类里面访问自己的私有成员
currentSm_->ChangeState(SHOW_STATE);
void StateMachine::ChangeState(int newState)
//路径 foundation/ace/ace_engine_lite/frameworks/src/core/router/js_page_state_machine.cpp
State *state = stateMap_[newState];
state->Handle(*this);
void PageShowState::Handle(StateMachine &sm)
//路径 foundation/ace/ace_engine_lite/frameworks/src/core/router/js_page_state.cpp
HILOG_INFO(HILOG_MODULE_ACE, "current state(%{public}d) -> show state", currState);
sm.ShowPage();
SchedulerLifecycle(record->GetToken(), STATE_ACTIVE);
//路径 foundation/aafwk/aafwk_lite/services/abilitymgr_lite/src/ability_service.cpp
SchedulerLifecycleInner(record, state);
int32_t AbilityService::SchedulerLifecycleInner(const AbilityRecord *record, int32_t state)
(void) SendMsgToJsAbility(state, record);
innerMsg.msgId = ACTIVE;
innerMsg.bundleName = record->GetAppName();
innerMsg.token = record->GetToken();
innerMsg.path = record->GetAppPath();
innerMsg.data = const_cast<void *>(record->GetAppData());
innerMsg.dataLength = record->GetDataLength();
osMessageQueueId_t appQueueId = record->GetMessageQueueId();
osStatus_t ret = osMessageQueuePut(appQueueId, static_cast<void *>(&innerMsg), 0, 0);
结合hos 2.0源码分析。
