26 lines
1.0 KiB
Zig
26 lines
1.0 KiB
Zig
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const std = @import("std");
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const c = @import("c");
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pub const ZigAllocator = struct {
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pub inline fn from(allocator: std.mem.Allocator) c.zig_allocator {
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return .{
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.ctx = @ptrCast(@alignCast(&allocator)),
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.alloc = &alloc,
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.free = &free,
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};
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}
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pub fn alloc(ctx: ?*const anyopaque, elem: usize, nelems: usize, alignment: usize) callconv(.C) ?*anyopaque {
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const self: *const std.mem.Allocator = @ptrCast(@alignCast(ctx));
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const ret = self.rawAlloc(elem * nelems, std.math.log2_int(usize, alignment), @returnAddress()) orelse return null;
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return @ptrCast(ret);
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}
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pub fn free(ctx: ?*const anyopaque, ptr: ?*anyopaque, elem: usize, nelems: usize, alignment: usize) callconv(.C) void {
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const self: *const std.mem.Allocator = @ptrCast(@alignCast(ctx));
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const memory: [*c]u8 = @ptrCast(ptr);
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const size = elem * nelems;
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self.rawFree(memory[0..size], std.math.log2_int(usize, alignment), @returnAddress());
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}
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};
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