Define 预处理器指令中的字符串文字
我想要在引用中使用 #define 指令。问题是：
我正在使用的嵌入式平台中有一个内置函数，它将文字汇编代码作为字符串。我想把它包装成一个宏。
__asm__("goto 0x2400");
上述内置函数处理器跳转到位置 0x2400 处的代码并开始在该地址执行（对于那些想知道的人，我正在编写一个引导加载程序，这就是为什么这是必要的）。因为地址在字符串中，所以我不能轻易替换它。我需要一种使函数通用的方法，以便我可以在任何地址开始执行代码。例如：
#define ASM_GOTO __asm__("goto X")
这不会导致正确的文本替换，因为 X 在引号中。有办法解决这个问题吗？
I would like to the #define directive inside of a quotation. Here's the problem:
There is a built-in function in the embedded platform that I'm using that takes literal assembly code as a string. I would like to wrap this into a macro.
__asm__("goto 0x2400");
The above built-in function the processor jumps to the code at location 0x2400 and starts executing at that address (for those wondering, I'm writing a bootloader which is why this is necessary). Because the address is in the string, I cannot easily replace it. I need a way to make the function generic so that I can start executing code at any address. For example:
#define ASM_GOTO __asm__("goto X")
This will not result in a correct text replacement because the X is in quotes. Is there a way around this?
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不过，这有一个小问题：
导致
__asm__("goto " "MAGIC_ADDRESS");，我预计这不是您想要的。所以，
可能更像它，因为在
ASM_GOTO的扩展中，X在STRINGIZE作用于它之前就被扩展了。如果您还不知道，请注意，虽然预处理器的结果是
"goto " "0x2400"（两个字符串文字标记），但它们在编译期间会组合成单个字符串文字（ C99 的 5.1.1.2/6)。这发生在宏扩展之后 (4)，但在语义分析之前 (7)。This has a slight problem, though:
Results in
__asm__("goto " "MAGIC_ADDRESS");, which I expect isn't what you want.So,
is probably more like it, since in the expansion of
ASM_GOTO,Xgets expanded beforeSTRINGIZEacts on it.If you didn't already know, be aware that although the result from the preprocessor is
"goto " "0x2400"(two string literal tokens), they're combined during compilation into a single string literal (5.1.1.2/6 of C99). This occurs after macros are expanded (4), but before semantic analysis (7).试试这个：
Try this:
您需要使用字符串化运算符。比如：
应该做你需要它做的事情。
You need to use the stringize operator. Something like:
should do what you need it to do.