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4ce7b57e86
The main goal here was to avoid allocating padding and header space if `malloc` already guarantees the alignment we need via `max_align_t`. Previously, the compiler was using `std.heap.raw_c_allocator` as its GPA in some cases depending on `std.c.max_align_t`, but that's pretty fragile (it meant we had to encode our alignment requirements into `src/main.zig`!). Perhaps more importantly, that solution is unnecessarily restrictive: since Zig's `Allocator` API passes the `Alignment` not only to `alloc`, but also to `free` etc, we are able to use a different strategy depending on its value. So `c_allocator` can simply compare the requested align to `Alignment.of(std.c.max_align_t)`, and use a raw `malloc` call (no header needed!) if it will guarantee a suitable alignment (which, in practice, will be true the vast majority of the time). So in short, this makes `std.heap.c_allocator` more memory efficient, and probably removes any incentive to use `std.heap.raw_c_allocator`. I also refactored the `c_allocator` implementation while doing this, just to neaten things up a little. |
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| build-web | ||
| c | ||
| compiler | ||
| compiler_rt | ||
| docs | ||
| include | ||
| init | ||
| libc | ||
| libcxx | ||
| libcxxabi | ||
| libtsan | ||
| libunwind | ||
| std | ||
| c.zig | ||
| compiler_rt.zig | ||
| fuzzer.zig | ||
| ubsan_rt.zig | ||
| zig.h | ||