157f66ec07
Several issues with pointer types are fixed: Prior to this commit, Zig would not canonicalize a pointer type with an explicit alignment to alignment=0 if it matched the pointee ABI alignment. In order to fix this, `Type.ptr` now takes a Target parameter. I also moved the host_size canonicalization to `Type.ptr` since target is now available. Similarly, is_allowzero in the case of C pointers is now treated as a canonicalization done by the function rather than a precondition. in-memory coercion for pointers now properly checks ABI alignment of pointee types instead of incorrectly treating the 0 value as an alignment. Type equality is completely reworked based on the tag() rather than the zigTypeTag(). It's still semantically based on zigTypeTag() but that knowledge is implied rather than dictating the control flow of the logic. Importantly, this fixes cases for opaques, structs, tuples, enums, and unions, where type equality was incorrectly returning based on whether the tag() values were equal. Additionally, pointer type equality now takes into account alignment. Because we canonicalize non-zero alignment which equals pointee type ABI alignment to alignment=0, this now can be a simple integer comparison. Type hashing is implemented for pointers and floats. Array types now additionally hash their sentinels. This regressed some behavior tests that were passing but only because of bugs regarding type equality. The C backend has a noticeable problem with lowering differently-aligned pointers (particularly slices) as the same type, causing C compilation errors due to duplicate declarations.
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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.