Nixyri/zig
1
0
Fork 0
mirror of https://github.com/ziglang/zig.git synced 2025-02-18 02:20:17 +00:00
Code Issues Packages Projects Releases Wiki Activity

heap: create a work-around page-allocator

Browse Source 
the risc-v backend doesn't have `@cmpxchg*` implemented and so it can't use the hint that the current page-allocator uses.
this work-around branch can be removed when I implement the atomic built-in.
This commit is contained in:
David Rubin 2024-07-15 01:52:08 -07:00
parent d3f75522d7
commit ba58b7b881
No known key found for this signature in database
GPG Key ID: A4390FEB5F00C0A5
1 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
lib/std/heap/PageAllocator.zig
View File

@ -34,6 +34,20 @@ fn alloc(_: *anyopaque, n: usize, log2_align: u8, ra: usize) ?[*]u8 {
return @ptrCast(addr);
}
if (builtin.zig_backend == .stage2_riscv64) {
const aligned_len = mem.alignForward(usize, n, mem.page_size);
const slice = posix.mmap(
null,
aligned_len,
posix.PROT.READ | posix.PROT.WRITE,
.{ .TYPE = .PRIVATE, .ANONYMOUS = true },
-1,
0,
) catch return null;
assert(mem.isAligned(@intFromPtr(slice.ptr), mem.page_size));
return slice.ptr;
}
const aligned_len = mem.alignForward(usize, n, mem.page_size);
const hint = @atomicLoad(@TypeOf(std.heap.next_mmap_addr_hint), &std.heap.next_mmap_addr_hint, .unordered);
const slice = posix.mmap(