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This implements the `error_name` instruction, which is emit for runtime `@errorName` callsites. The implementation works by creating 2 symbols and corresponding atoms. The initial symbol contains a table which each element consisting of a slice where the ptr field points towards the error name, and the len field contains the error name length without the sentinel. The secondary symbol contains a list of all error names from the global error set. During the error_name instruction, we first get a pointer to the first symbol. Then based on the operand we perform pointer arithmetic, to get the correct index into this table. e.g. error index 2 = ptr + (2 * ptr size). The result of this will be stored in a local and then returned as instruction result. During `flush()` we populate the error names table by looping over the global error set and creating a relocation for each error name. This relocation is appended to the table symbol. Then finally, this name is written to the names list itself. Finally, both symbols' atom are allocated within the rest of the binary. When no error name is referenced, the `error_name_symbol` is never set, and therefore no error name table will be emit into the final binary.
A general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
Resources
- Introduction
- Download & Documentation
- Chapter 0 - Getting Started | ZigLearn.org
- Community
- Contributing
- Code of Conduct
- Frequently Asked Questions
- Community Projects
Installation
- download a pre-built binary
- install from a package manager
- build from source
- bootstrap zig for any target
License
The ultimate goal of the Zig project is to serve users. As a first-order effect, this means users of the compiler, helping programmers to write better software. Even more important, however, are the end-users.
Zig is intended to be used to help end-users accomplish their goals. Zig should be used to empower end-users, never to exploit them financially, or to limit their freedom to interact with hardware or software in any way.
However, such problems are best solved with social norms, not with software licenses. Any attempt to complicate the software license of Zig would risk compromising the value Zig provides.
Therefore, Zig is available under the MIT (Expat) License, and comes with a humble request: use it to make software better serve the needs of end-users.
This project redistributes code from other projects, some of which have other licenses besides MIT. Such licenses are generally similar to the MIT license for practical purposes. See the subdirectories and files inside lib/ for more details.