00dfd67bee
The previous runtime_detect.zig called std.zig.system.resolveTargetQuery which pulled in the entire Zig target/CPU model table infrastructure for every architecture (~4,000 symbols, ~175 KB of data tables, ~130 KB of code). This bloated the binary by ~500 KB and shifted code layout enough to cause a measurable icache/branch-predictor regression in unrelated hot paths like the terminal parser (~20% more cycles for identical instruction counts). Replace with minimal, direct CPU feature detection per architecture: CPUID + XGETBV inline assembly on x86, sysctlbyname on Darwin AArch64, and getauxval/prctl via std.os.linux (direct syscalls, no libc) on Linux for AArch64, PPC, S390x, RISC-V, and LoongArch. Split into per-architecture files under src/detect/ for maintainability.
Packages
This folder contains packages written for and used by Ghostty that could potentially be useful for other projects. These are in-tree with Ghostty because I don't want to maintain them as separate projects (i.e. get dedicated issues, PRs, etc.). If you want to use them, you can copy and paste them into your project.
License
This license only applies to the contents of the pkg folder within
the Ghostty project. This license does not apply to the rest of the
Ghostty project.
Copyright © 2024 Mitchell Hashimoto, Ghostty contributors
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.