浅析鸿蒙(ark runtime)执行动态代码
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.markdown-body h3:before { border-bottom: 2px solid rgba(77, 208, 225, 1); width: 100%; content: ""; display: block; height: 28px; position: absolute; left: 0; top: 0; bottom: -2px; margin: auto; background-size: 28px 28px; background-image: url("data:image/png;base64,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"); background-repeat: no-repeat; animation: 2s infinite alternate h3animationbefore }
@keyframes h3AnimationBefore { 0% { width: 28px } 25% { width: 100% } 50% { width: 100% } 100% { width: 100% } }
.markdown-body h3:after { content: ""; display: block; width: 28px; height: 28px; position: absolute; border: 2px solid rgba(77, 208, 225, 1); border-radius: 50%; right: -15px; top: 0; bottom: 0; margin: auto; background-size: 28px 28px; background-image: url("data:image/png;base64,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"); animation: 2s infinite alternate h3animationafter }
@keyframes h3AnimationAfter { 0% { } 10% { } 50% { transform: rotate(-1turn) } 100% { transform: rotate(-1turn) } }
.markdown-body h4 { font-size: 16px }
.markdown-body h5 { font-size: 15px }
.markdown-body h6 { margin-top: 5px }
.markdown-body p { line-height: inherit; margin: 22px 0; letter-spacing: 2px; font-size: 14px; word-spacing: 2px }
.markdown-body img { max-width: 80%; border-radius: 6px; display: block; margin: 20px auto !important; object-fit: contain; box-shadow: 0 0 16px rgba(110, 110, 110, 0.45) }
.markdown-body figcaption { display: block; font-size: 13px; color: rgba(43, 43, 43, 1) }
.markdown-body figcaption:before { content: ""; background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgBAMAAACBVGfHAAAAGFBMVEVHcExAuPtAuPpAuPtAuPpAuPtAvPxAuPokzOX5AAAAB3RSTlMAkDLqNegkoiUM7wAAAGBJREFUKM9jYBhcgMkBTUDVBE1BeDGqEtXychNUBeXlKEqACsrLQxB8lnCQQClCiWt5OYoSiAIkJVAF5eVBqAqAShTAAs7l5ShKWMwRAmAlSArASpAVgJUkCqIAscESHwCVVjMBK9JnbQAAAABJRU5ErkJggg=="); display: inline-block; width: 18px; height: 18px; background-size: 18px; background-repeat: no-repeat; background-position: center; margin-right: 5px; margin-bottom: -5px }
.markdown-body hr { border-top: 1px solid rgba(77, 208, 225, 1); border-right: none; border-bottom: none; border-left: none; margin-top: 32px; margin-bottom: 32px }
.markdown-body del { color: rgba(77, 208, 225, 1) }
.markdown-body code { border-radius: 2px; overflow-x: auto; background-color: rgba(77, 208, 225, 0.08); color: rgba(38, 198, 218, 1); padding: 0.195em 0.4em }
.markdown-body pre { font-family: Menlo, Monaco, Consolas, Courier New, monospace; overflow: auto; position: relative; line-height: 1.75; box-shadow: 0 0 8px rgba(110, 110, 110, 0.45); border-radius: 4px; margin: 16px }
.markdown-body pre:before { content: ""; display: block; height: 30px; width: 100%; margin-bottom: -7px; background: url("data:image/png;base64,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") 10px 10px / 40px no-repeat }
.markdown-body pre>code { font-size: 12px; padding: 15px 12px; margin: 0; word-break: normal; display: block; overflow-x: auto; color: rgba(51, 51, 51, 1); background: rgba(248, 248, 248, 1) }
.markdown-body a { color: rgba(77, 208, 225, 1); border-bottom: 1px solid rgba(77, 208, 225, 1); font-weight: 400; text-decoration: none; margin: 0 4px }
.markdown-body a:active, .markdown-body a:hover { background-color: rgba(77, 208, 225, 0.1) }
.markdown-body strong { color: rgba(38, 198, 218, 1) }
.markdown-body strong:before { content: "「" }
.markdown-body strong:after { content: "」" }
.markdown-body em { font-style: normal; color: rgba(77, 208, 225, 1); font-weight: 700 }
.markdown-body table { display: inline-block !important; font-size: 12px; width: auto; max-width: 100%; overflow: auto; border: 1px solid rgba(246, 246, 246, 1) }
.markdown-body thead { background: rgba(246, 246, 246, 1); color: rgba(0, 0, 0, 1); text-align: left }
.markdown-body tr:nth-child(2n) { background-color: rgba(77, 208, 225, 0.05) }
.markdown-body td, .markdown-body th { padding: 12px 7px; line-height: 24px }
.markdown-body td { min-width: 120px }
.markdown-body blockquote { margin: 2em 0; padding: 24px 32px; border-left: 4px solid rgba(38, 198, 218, 1); background: rgba(77, 208, 225, 0.15); position: relative }
.markdown-body blockquote:before { content: "❝"; top: 8px; left: 8px; color: rgba(77, 208, 225, 1); font-size: 30px; line-height: 1; font-weight: 700; position: absolute; opacity: 0.7 }
.markdown-body blockquote:after { content: "❞"; font-size: 30px; position: absolute; right: 8px; bottom: 0; color: rgba(77, 208, 225, 1); opacity: 0.7 }
.markdown-body blockquote p { color: rgba(89, 89, 89, 1); line-height: 2 }
.markdown-body ol, .markdown-body ul { color: rgba(89, 89, 89, 1); padding-left: 28px }
.markdown-body ol li, .markdown-body ul li { margin-bottom: 0; list-style: inherit }
.markdown-body ol li .task-list-item, .markdown-body ul li .task-list-item { list-style: none }
.markdown-body ol li .task-list-item ol, .markdown-body ol li .task-list-item ul, .markdown-body ul li .task-list-item ol, .markdown-body ul li .task-list-item ul { margin-top: 0 }
.markdown-body ol ol, .markdown-body ol ul, .markdown-body ul ol, .markdown-body ul ul { margin-top: 3px }
.markdown-body ol li { padding-left: 6px }
@media (max-width: 720px) { .markdown-body h1 { font-size: 24px } .markdown-body h2 { font-size: 20px } .markdown-body h3 { font-size: 18px } }.markdown-body pre, .markdown-body pre>code.hljs { background: rgba(30, 30, 30, 1); color: rgba(220, 220, 220, 1) }
.hljs-keyword, .hljs-link, .hljs-literal, .hljs-name, .hljs-symbol { color: rgba(86, 156, 214, 1) }
.hljs-link { text-decoration: underline }
.hljs-built_in, .hljs-type { color: rgba(78, 201, 176, 1) }
.hljs-class, .hljs-number { color: rgba(184, 215, 163, 1) }
.hljs-meta-string, .hljs-string { color: rgba(214, 157, 133, 1) }
.hljs-regexp, .hljs-template-tag { color: rgba(154, 83, 52, 1) }
.hljs-formula, .hljs-function, .hljs-params, .hljs-subst, .hljs-title { color: rgba(220, 220, 220, 1) }
.hljs-comment, .hljs-quote { color: rgba(87, 166, 74, 1); font-style: italic }
.hljs-doctag { color: rgba(96, 139, 78, 1) }
.hljs-meta, .hljs-meta-keyword, .hljs-tag { color: rgba(155, 155, 155, 1) }
.hljs-template-variable, .hljs-variable { color: rgba(189, 99, 197, 1) }
.hljs-attr, .hljs-attribute, .hljs-builtin-name { color: rgba(156, 220, 254, 1) }
.hljs-section { color: rgba(255, 215, 0, 1) }
.hljs-emphasis { font-style: italic }
.hljs-strong { font-weight: 700 }
.hljs-bullet, .hljs-selector-attr, .hljs-selector-class, .hljs-selector-id, .hljs-selector-pseudo, .hljs-selector-tag { color: rgba(215, 186, 125, 1) }
.hljs-addition { background-color: rgba(20, 66, 18, 1) }
.hljs-addition, .hljs-deletion { display: inline-block; width: 100% }
.hljs-deletion { background-color: rgba(102, 0, 0, 1) }
.markdown-body { line-height: 1.75; font-weight: 400; font-size: 15px; overflow-x: hidden; color: rgba(43, 43, 43, 1); font-family: -apple-system, system-ui, BlinkMacSystemFont, Helvetica Neue, PingFang SC, Hiragino Sans GB, Microsoft YaHei, Arial, sans-serif; background-image: linear-gradient(90deg, rgba(159, 219, 252, 0.15) 3%, rgba(0, 0, 0, 0) 0), linear-gradient(1turn, rgba(159, 219, 252, 0.15) 3%, rgba(0, 0, 0, 0) 0); background-size: 20px 20px; background-position: center }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4, .markdown-body h5, .markdown-body h6 { padding: 30px 0; margin-top: 35px; margin-bottom: 10px; color: rgba(77, 208, 225, 1) }
.markdown-body h1 { font-size: 30px; text-align: center; position: relative; width: max-content; margin: 0 auto }
.markdown-body h1:before { position: absolute; content: ""; z-index: -1; top: -20px; height: 100%; width: 100px; left: 0; right: 0; margin: 0 auto; background: 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@keyframes h1Animate { 0% { background-position: right bottom } 50% { background-position: right } 100% { background-position: right bottom } }
.markdown-body h2 { display: block; border-bottom: 4px solid rgba(77, 208, 225, 1); position: relative; font-size: 24px; padding: 12px 32px; margin: 30px 0 }
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.markdown-body h2:after, .markdown-body h2:before { content: ""; display: block; position: absolute; bottom: 0 }
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.markdown-body h3 { margin: 30px 0; font-size: 18px; position: relative; padding: 4px 32px; width: max-content }
.markdown-body h3:before { border-bottom: 2px solid rgba(77, 208, 225, 1); width: 100%; content: ""; display: block; height: 28px; position: absolute; left: 0; top: 0; bottom: -2px; margin: auto; background-size: 28px 28px; background-image: url("data:image/png;base64,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"); background-repeat: no-repeat; animation: 2s infinite alternate h3animationbefore }
@keyframes h3AnimationBefore { 0% { width: 28px } 25% { width: 100% } 50% { width: 100% } 100% { width: 100% } }
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.markdown-body del { color: rgba(77, 208, 225, 1) }
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.markdown-body a { color: rgba(77, 208, 225, 1); border-bottom: 1px solid rgba(77, 208, 225, 1); font-weight: 400; text-decoration: none; margin: 0 4px }
.markdown-body a:active, .markdown-body a:hover { background-color: rgba(77, 208, 225, 0.1) }
.markdown-body strong { color: rgba(38, 198, 218, 1) }
.markdown-body strong:before { content: "「" }
.markdown-body strong:after { content: "」" }
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.markdown-body tr:nth-child(2n) { background-color: rgba(77, 208, 225, 0.05) }
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.markdown-body td { min-width: 120px }
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.markdown-body ol ol, .markdown-body ol ul, .markdown-body ul ol, .markdown-body ul ul { margin-top: 3px }
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@media (max-width: 720px) { .markdown-body h1 { font-size: 24px } .markdown-body h2 { font-size: 20px } .markdown-body h3 { font-size: 18px } }.markdown-body pre, .markdown-body pre>code.hljs { background: rgba(30, 30, 30, 1); color: rgba(220, 220, 220, 1) }
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众所周知，鸿蒙next的应用运行在ark runtime下，而ark runtime是驱动着鸿蒙应用的基石。ark runtime支持动态类型和静态类型在内的多种编程语言（目前支持js, ts, arkTs等，与传统js runtime不同的是，ark compiler工具链在编译ts源码时，不会像传统js引擎，先将ts转为js代码，再交给js runtime执行，而是在编译ts源码时，会分析推导类型信息，在运行前即可预生成内联缓存从而加速字节码执行）。详细的代码实现以及官方文档大家可以去这里看：arkcompiler仓库。
整体上看，ark runtime仍然是符合Ecmascript规范的js虚拟机实现。既然是js虚拟机实现，那大家一定会想到这样执行远程动态代码下发/热修等场景在鸿蒙上岂不是可以遍地开花，分分钟绕过App Gallary的代码签名/审核随意更新客户端代码！
Eval / new Function
提起使用js动态执行代码，大家第一个想起的一定是eval。
Eval作为js标准规范的方法，用于执行一段javascript表达式、声明、脚本并返回代码段执行结果。同时使用Function prototype也能达到相同的效果。
果然没有那么简单，还没有编译Dev Eco Studio的静态检查便提示无法在arkts中使用标准库。
这可难不倒大家，众所周知（大声宣扬），arkts的严格的静态检查仅适用于ets文件，只要把代码写在ts文件中，就能愉快的使用ts/js的大部分特性了（甚至any，随心所欲的向任意对象中加入/删除字段、方法等）。
说干就干，代码是不报错了，程序也跑起来了，但是在调用时app果断崩溃，调用eval / new Function分别提示：
Error message:not support eval().
Error message:Not support eval. Forbidden using new Function()/Function().
export class InjectUtil {
static inject(obj: any) {
eval("1+1")
InjectUtil.evalByFunc()
obj.Nav = null
}
static evalByFunc() {
var fn = Function as any
return fn('console.log(eval!!!!!!!!!!!!!!!!!!!!!!!!!!!!)')();
}
}
看来arkcompiler在运行时也屏蔽掉了js可以随意动态执行代码的特性。看来直接使用ts的api是无法达到动态执行代码的目的。
查阅官方文档，已经对ark runtime的这一表现作出了解释：
ArkCompiler前端编译工具链将ArkTS/TS/JS程序预先静态编译为方舟字节码，并且还提供了多重混淆能力的增强，有效地提升了开发者代码资产的安全强度。另外出于安全的考虑，ArkCompiler不支持sloppy模式的JS代码，也不支持eval等运行动态字符串的功能。
在查阅了鸿蒙官方文档后，发现其并未完全堵死ark runtime动态代码的执行能力，在官方支持上仍然提供了使用ndk来开发动态js代码执行的能力。
JSVM-API
JSVM-API是鸿蒙中提供的基于标准JS引擎提供的一套稳定ABI，为开发者提供了一套较为完整的JS引擎能力，包括创建和销毁引擎，执行JS代码，JS/C++交互等关键能力。相当于v8 api的精简版。
这里的js engine在官方文档上并未说明是否是ark runtime，但基于目前ark runtime的开源代码，这里js vm的能力应该还是由ark runtime提供（欢迎勘误）。
受限于JSVM-API提供的能力，我们无法获取到主线程所在的jsvm env（也有可能主线程根本不是jsvm），只能通过jsvm创建一个全新的隔离环境，在这个js环境中，我们可以动态的执行js代码。
使用jsvm执行js脚本的主要流程:
核心代码
// jsvm提供的接口头文件
#include "ark_runtime/jsvm.h"
JSVM_VM* vm;
JSVM_ENV* env;
// 创建jsvm虚拟机 通过napi调用
static void createArcJsContext() {
JSVM_Status status;
// 初始化 可以设置vm启动参数 argv argc
JSVM_InitOptions init_options;
memset(&init_options, 0, sizeof(init_options));
OH_JSVM_Init(&init_options);
// 虚拟机实例
// 可以设置gc相关参数、snapshot bin等
JSVM_CreateVMOptions options;
memset(&options, 0, sizeof(options));
status = OH_JSVM_CreateVM(&options, vm);
// vm scope。在jsvm中scope 即作用域，用于资源管理，在scope打开期间资源可用，scope关闭后自愿释放（RAII）
// 类似v8中各种scope的设计，在后续使用中，各种scope可以以raii风格封装方便使用
JSVM_VMScope vm_scope;
status = OH_JSVM_OpenVMScope(js_vm, &vm_scope);
// js env
js_env = new JSVM_Env;
status = OH_JSVM_CreateEnv(...);
// env scope
status = OH_JSVM_OpenEnvScope(...);
}
static napi_value EvalJS(napi_env env, napi_callback_info info) {
...省略...
// 待运行js代码
std::string scriptStr = napiValueToString(env, args[1]);
// scope 用于资源管理
OH_JSVM_OpenHandleScope(...);
// 转为jsvm字符串
OH_JSVM_CreateStringUtf8(...);
// 编译js脚本
OH_JSVM_CompileScript(...);
// 运行脚本
OH_JSVM_RunScript(...);
// 获取执行结果（省略...）
...省略...
}
// 释放先前创建的各种scope 关闭vm napi调用
static void releaseResources() {
OH_JSVM_CloseEnvScope(...);
OH_JSVM_DestroyEnv(...);
OH_JSVM_CloseVMScope(...);
OH_JSVM_DestroyVM(...);
}
// index.d.ts 导出napi方法定义
export const createJsCore: (fun: Function) => number;
export const releaseJsCore: (a: number) => void;
export const evaluateJs: (a: number, str: string) => string;
// 创建首个运行环境，并绑定TS回调
const coreId = testNapi.createJsCore(MyCallback);
let sourcecodestr = `
{
let a = "hello World";
consoleinfo(a);
const mPromise = createPromise();
mPromise.then((result) => {
assertEqual(result, 0);
onJSResultCallback(result, "abc", "v");
});
a;
};`;
// 在首个运行环境中执行JS代码
console.log("TEST evalUateJS : " + testNapi.evalUateJS(coreId, sourcecodestr));
// 释放运行环境
testNapi.releaseJsCore(coreId);
实测js代码片段可以成功运行编译执行，从应用的主线程调用napi创建jsvm，并执行指定的一段js代码，在jsvm中创建的环境也能调用创建vm时传入的回调函数将结果返回主线程/主vm。
可以正常实现动态代码和app主线程代码的双向调用：
主isolate(主线程) -> napi -> 用户isolate(jsvm)
用户isolate(jsvm) -> napi -> 主isolate(主线程)
优点
- js执行环境与主线程环境隔离，通过napi进行中转通讯，在jsvm环境中执行代码不会影响到主线程代码执行，相对安全。
缺点
- 需要手动管理jsvm、相关vm env等，使用较为繁琐，应用前需要对js vm api进行封装。
- 动态执行的js代码不能使用import等，需为完整逻辑代码。
- 不能调用主vm中中相关对象/api。
- 未经编译arc compiler编译优化，可能会有性能损失。
- 需要写大量的binding相关的胶水代码，繁杂的工作量较大。
NAPI
node的napi将v8底层数据结构全部黑盒化，抽象为统一的接口，使得开发者无需再使用v8相关api操作，与v8解耦，使开发者不会遇到由于v8引擎变更或node版本升级而重新开发的风险。
在鸿蒙中也实现了napi相关规范与接口定义，使开发者可以以napi规范来开发鸿蒙应用的native扩展。
napi_run_script
napi_run_script是napi标准规范中执行js代码的函数，依赖于napi，该方法的调用比较简单，直接上运行代码及调试结果
在鸿蒙中napi_run_script调用可以成功完成，也返回了napi_ok成功状态的返回码，但是实际上代码并没有执行，脚本运行返回值也被置为null。
查阅官方文档，并没有对napi_run_script这个接口做出说明，猜测ark runtime屏蔽了或未实现这个接口。
napi_run_script_path
针对这个接口，鸿蒙官方有给相关说明：napi_run_script_path官方文档。文档中提到可以使用该接口执行abc格式的文件（arkts编译后生成的字节码产物），但没有给出操作流程。摸索了下，鸿蒙sdk中的es2abc工具可以实现这个目标：
/Applications/DevEco-Studio.app/Contents/sdk/HarmonyOS-NEXT-DB3/openharmony/ets/build-tools/ets-loader/bin/ark/build-mac/bin/es2abc
用法（注意，使用macos的同学需要将es2abc这个文件拷贝出.app， 否则会因为权限不足的原因拷贝失败）：
./es2abc test.js
将生成的test.abc文件拷贝至entry的rawfile中，调用即可执行对应的代码。
napi_run_script_path(env, "/entry/resources/rawfile/test.abc", &result);
附上测试脚本test.ets：
console.log('hello world from dynamic code')
console.log(globalThis)
globalThis.Cornerstone.hello()
可以发现动态下发的代码可以正常调用到我们在程序运行时向globalThis中注入的Cornerstone对象，说明动态执行的代码与app运行的主线程代码处于同一vm环境。
优点
使用napi执行动态代码，无需手动管理vm虚拟机的生命周期，同时可以复用并调用到主vm环境中已存在的对象，更加灵活友好。
可享受到.abc带来的性能优化。
但同时下发的abc文件也与jsvm的限制一致，无法使用import，需将动态代码中的相关依赖提前注入到vm环境/携带完整逻辑等。
缺点
因为执行环境与app主vm一致，恶意代码可随意破环主vm中相关内存数据。
总结
出于安全考虑鸿蒙（ark runtime）在ts层面对动态执行代码作出了诸多限制，但是我们仍能通过napi / jsvm的方式达到动态执行代码的目的，尤其是napi，可在主vm环境中执行动态代码，并且能享受到方舟编译器所带来的性能优化。
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