How do slashes and middots in Go's C source code contribute to function namespacing and linking?

Susan Sarandon
Release: 2024-11-08 12:11:01
Original
546 people have browsed it

How do slashes and middots in Go’s C source code contribute to function namespacing and linking?

Slashes and Dots in Function Names and Prototypes in Go's C Source

Go's C source code, as exemplified by the race.c file, incorporates non-standard character usage that raises questions about its validity.

Extension to C Standard

The C compiler used for Go, rooted in the Plan 9 C compiler, extends the standard with support for UTF-8 characters in identifiers. One notable extension is the special handling of the middot character (·).

Middot and Namespace Separation

The middot serves as a namespace separator in Go's internal linking process. When compiling a C file with UTF-8 identifiers, the middot is translated to a dot (.) in object files. The Go linker interprets this dot as a namespace separator.

Example

Consider the following C code written in UTF-8 without BOM:

Compiling this code produces the following symbols:

Notice that ""Bar1() has a capital B to make it visible to Go code. It is equivalent to the Go function "func Bar1() {}" in terms of the resulting symbol.

The "Empty" Namespace

The "" namespace is a special namespace used as a placeholder. When importing a package using this namespace, as in:

The linker replaces "" with the actual package path during importing. Thus, in the linked binary, we will find the following symbol:

Conclusion

The slashes and middots in Go's C source extend the standard, providing a way to namespace and differentiate function names. This convention facilitates building and linking Go applications.

The above is the detailed content of How do slashes and middots in Go's C source code contribute to function namespacing and linking?. For more information, please follow other related articles on the PHP Chinese website!

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template