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这是一个创建于 3454 天前的主题，其中的信息可能已经有所发展或是发生改变。
Bitcode is an intermediate representation of a compiled program. Apps you upload to iTunes Connect that contain bitcode will be compiled and linked on the App Store. Including bitcode will allow Apple to re-optimize your app binary in the future without the need to submit a new version of your app to the store.
Note: For iOS apps, bitcode is the default, but optional. If you provide bitcode, all apps and frameworks in the app bundle need to include bitcode. For watchOS apps, bitcode is required.
Note: For iOS apps, bitcode is the default, but optional. If you provide bitcode, all apps and frameworks in the app bundle need to include bitcode. For watchOS apps, bitcode is required.
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1
bdbai 2015-06-09 13:44:38 +08:00 via iPhone
以及CLR
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2
ether 2015-06-09 16:31:00 +08:00
swift那边不清楚。Clang那边得到的llvm bitcode （其实就是llvm IR的二进制形式）是平台相关的。首先clang那边就生成了平台相关的abi，其次llvm ir里面的Data Layout就包含了目标平台的东西。而且llvm 的那些优化会根据data layout做平台相关优化。
llvm IR 更多是一种用来represent我们程序，供llvm不同的transformation和analysis pass共享的一种编译器内部数据结构。 |
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3
mozartgho 2015-06-09 16:35:02 +08:00
LLVM本来就是一个编译器后端，用来把中间代码编译成机器码。它的中间代码是语言无关的，和JVM有根本的不同。你说的bitcode应该是指LLVM的中间代码。另外请贴出完整的文章链接。不知道文章是什么意思，是说以后ObjC和Swift都编译成LLVM中间码吗？
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4
typcn 2015-06-09 16:46:12 +08:00
JVM = SHITVIRUALMACHINE
LLVM = COMPLIER BACKEND |
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egen 2015-06-09 16:49:06 +08:00
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6
forcecharlie 2015-06-10 10:18:36 +08:00
@ether 最终还是会用llc 编译成机器码的。很jvm是不同的
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