我们如何在Apple平台的AArch64程序集中的一行上编写多个语句? [英] How do we write multiple statements on one line in AArch64 assembly for Apple platforms?

问题描述

我正在将一些Arm64汇编语言移植到M1.

I'm porting a bit of Arm64 assembly language to an M1.

其中一些是通过C预处理生成的，其中单个 #define 宏会生成多个用分号分隔的语句.

Some of it is generated by C preprocessing, in which a single #define macro generates multiple statements separated by semicolon.

不幸的是，在M1上，汇编器将分号视为注释字符.

Unfortunately, on the M1, the assembler treats the semicolon as a comment character.

例如:

#define DEFUN(NAME)  \
  .globl _ ## NAME ; \
  .palign 2 ;        \
  _ ## NAME:

使 .globl 指令之后的所有内容均被视为注释.

causes everything after the .globl directive to be treated as a comment.

MacOS as 手册页不提供任何线索；它没有语法方面的内容.

The MacOS as man page provides no clue; it has no coverage of syntax.

是否存在用于分隔语句的替代字符?我尝试使用 @ 和！，但均被拒绝.

Is there an alernative character for separating statements? I tried using @ and !, but both are rejected.

回答此问题是在这里没有用.

推荐答案

对于面向Apple平台的aarch64程序集，您可以使用 %% 作为分隔符.不确定是否/在哪里记录了它，但是它是在LLVM源中设置的 libunwind 和 compiler-rt ，因此它可能不会一时兴起.

For aarch64 assembly targeting Apple platforms, you can use %% as separator character. Not sure if/where it's documented, but it's set in the LLVM source here. And even if it might not be documented explicitly anywhere, it is used in a number of places, e.g. in libunwind and compiler-rt, so it probably won't change in a whim.

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