使用 Hermes 反汇编 index.android.bundle 的 React-native 0.61.2 [英] React-native 0.61.2 with hermes disassembling index.android.bundle

问题描述

我使用 react-native 0.61.2 创建了我的应用程序的发布版本并启用了 Hermes.在我的 Crashlytics 中，我收到有关崩溃的信息以及堆栈跟踪.以前我曾经应用 apktool 从我的 apk 中提取 index.android.bundle，它包含我能够通过堆栈跟踪找到问题的 js 代码.

I created a release build of my app with react-native 0.61.2 and enabled Hermes. In my Crashlytics I receive information about crashes along with stacktraces. Perviously I used to apply apktool to extract index.android.bundle from my apk, and it contained js code where I was able to find the issue by stacktrace.

但现在使用 Hermes index.android.bundle 似乎包含字节码而不是 js，我浪费了一天试图反汇编它.我尝试的最后一件事是 中提到的 hbcdump 工具https://github.com/facebook/hermes/blob/master/doc/BuildingAndRunning.md，但我得到的只是错误:无法反序列化字节码:字节码版本错误.预期为 73，但得到 62"

But now using Hermes index.android.bundle seems to contain bytecode rather than js and I wasted a day trying to disassemble it. The last thing I tried was hbcdump tool mentioned in https://github.com/facebook/hermes/blob/master/doc/BuildingAndRunning.md, but all I get is "Error: fail to deserializing bytecode: Wrong bytecode version. Expected 73 but got 62"

如何反汇编用 Hermes 创建的 index.android.bundle?非常感谢任何帮助！

What should I do to disassemble index.android.bundle created with Hermes? Any help is highly appreciated!

推荐答案

从 Hermes v0.5.0 开始，还有一个 hermes-engine-cli 包含字节码反汇编程序的 NPM.它只与对应的hermes-engine 版本兼容(即hermes-engine-cli@0.5.0 与hermes-engine@0.5.0 兼容代码>).

As of Hermes v0.5.0, there's also a hermes-engine-cli NPM that contains a bytecode disassembler. It is only compatible with the corresponding hermes-engine version (i.e. hermes-engine-cli@0.5.0 works with hermes-engine@0.5.0).

它仍然主要对编译器开发人员有用，而不是用于调试应用崩溃.

It's still primarily useful for compiler developers, and not for debugging app crashes.

Hermes 工具不向后兼容，因此您需要先检查正确的版本.对于字节码版本 62，您可以使用 git checkout v0.2.1 签出 v0.2.1 版本.对于任意字节码版本，git log -p include/hermes/BCGen/HBC/BytecodeFileFormat.h 将显示哪些提交将格式更新为哪些版本.

Hermes tools are not backwards compatible, so you need to check out the correct version first. For bytecode version 62, you can checkout the the v0.2.1 release with git checkout v0.2.1. For arbitrary bytecode versions, git log -p include/hermes/BCGen/HBC/BytecodeFileFormat.h will show which commits updated the format to which versions.

一旦构建，您可以在提示符下使用 hbcdump myfile.hbc 后跟 disassemble 来显示文件的禁用版本.

Once built, you can use hbcdump myfile.hbc followed by disassemble at the prompt to show a disabled version of the file.

请注意，hbcdump 用于开发/调试编译器，与 javap -c 和 objdump -d 一样.以下是您可以期待的输出类型:

Be aware that hbcdump is intended for developing/debugging compilers, in the same vein as javap -c and objdump -d. Here's the kind of output you can expect:

Function<fizzbuzz>1(1 params, 22 registers, 0 symbols):
Offset in debug table: src 0xd, vars 0x0
fizzbuzz.js[1:21]
    LoadConstZero     r11
    LoadConstUInt8    r10, 15
    LoadConstUInt8    r9, 3
    LoadConstString   r8, "Fizzbuzz"
    LoadConstString   r7, "Fizz"
    LoadConstString   r6, "Buzz"
    GetGlobalObject   r5
    LoadConstUndefined r0
    LoadConstUInt8    r4, 1
    LoadConstUInt8    r3, 100
    LoadConstUInt8    r2, 5
    LoadConstZero     r1
L2:
fizzbuzz.js[1:21]
    Mod               r12, r1, r10
    Mov               r13, r8
    JStrictEqual      L1, r12, r11
    Mod               r12, r1, r9
    Mov               r13, r7
    JStrictEqual      L1, r12, r11
    Mod               r12, r1, r2
    Mov               r13, r6
    JStrictEqual      L1, r12, r11
    AddEmptyString    r13, r1
L1:
fizzbuzz.js[8:5]
    TryGetById        r12, r5, 1, "print"
    Call2             r12, r12, r0, r13
    AddN              r1, r1, r4
    JLessN            L2, r1, r3
    Ret               r0

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