78902db68b
Before, Sema for comptime `@bitCast` would return the same Value but change the Type. This gave invalid results because, for example, an integer Value when the Type is a float would be interpreted numerically, but `@bitCast` needs it to reinterpret how they would be stored in memory. This requires a mechanism to serialize a Value to a byte buffer and deserialize a Value from a byte buffer. Not done yet, but needs to happen: comptime dereferencing a pointer to a Decl needs to perform a comptime bitcast on the loaded value. Currently the value is silently wrong in the same way that `@bitCast` was silently wrong before this commit. The logic in Value for handling readFromMemory for large integers is only correct for small integers. It needs to be fleshed out for proper big integers. As part of this change: * std.math.big.Int: initial implementations of readTwosComplement and writeTwosComplement. They only support bit_count <= 128 so far and panic otherwise. * compiler-rt: move the compareXf2 exports over to the stage2 section. Even with the improvements in this commit, I'm still seeing test failures in the widening behavior tests; more investigation is needed.
A general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
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- Introduction
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- Chapter 0 - Getting Started | ZigLearn.org
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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.