motiejus/zig
1
Fork 0
Code Releases Activity

change semantics of @memcpy and @memset

Browse Source 
Now they use slices or array pointers with any element type instead of
requiring byte pointers.

This is a breaking enhancement to the language.

The safety check for overlapping pointers will be implemented in a
future commit.

closes #14040
This commit is contained in:
Andrew Kelley
2023-04-13 21:44:40 -07:00
parent 8d88dcdc61
commit a5c910adb6
33 changed files with 220 additions and 279 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
lib/std/array_list.zig
View File

@@ -121,7 +121,7 @@ pub fn ArrayListAligned(comptime T: type, comptime alignment: ?u29) type {
const new_memory = try allocator.alignedAlloc(T, alignment, self.items.len);
mem.copy(T, new_memory, self.items);
@memset(@ptrCast([*]u8, self.items.ptr), undefined, self.items.len * @sizeOf(T));
@memset(self.items, undefined);
self.clearAndFree();
return new_memory;
}
@@ -281,11 +281,7 @@ pub fn ArrayListAligned(comptime T: type, comptime alignment: ?u29) type {
const new_len = old_len + items.len;
assert(new_len <= self.capacity);
self.items.len = new_len;
@memcpy(
@ptrCast([*]align(@alignOf(T)) u8, self.items.ptr + old_len),
@ptrCast([*]const u8, items.ptr),
items.len * @sizeOf(T),
);
@memcpy(self.items[old_len..][0..items.len], items);
}
pub const Writer = if (T != u8)
@@ -601,7 +597,7 @@ pub fn ArrayListAlignedUnmanaged(comptime T: type, comptime alignment: ?u29) typ
const new_memory = try allocator.alignedAlloc(T, alignment, self.items.len);
mem.copy(T, new_memory, self.items);
@memset(@ptrCast([*]u8, self.items.ptr), undefined, self.items.len * @sizeOf(T));
@memset(self.items, undefined);
self.clearAndFree(allocator);
return new_memory;
}
@@ -740,11 +736,7 @@ pub fn ArrayListAlignedUnmanaged(comptime T: type, comptime alignment: ?u29) typ
const new_len = old_len + items.len;
assert(new_len <= self.capacity);
self.items.len = new_len;
@memcpy(
@ptrCast([*]align(@alignOf(T)) u8, self.items.ptr + old_len),
@ptrCast([*]const u8, items.ptr),
items.len * @sizeOf(T),
);
@memcpy(self.items[old_len..][0..items.len], items);
}
pub const WriterContext = struct {