language-servers/roc
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write List.append in zig

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Folkert 2021-03-03 15:29:22 +01:00
parent 050958d053
commit 9873eb358b
4 changed files with 53 additions and 50 deletions
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21
compiler/builtins/bitcode/src/list.zig
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@ -86,21 +86,21 @@ pub const RocList = extern struct {
const old_length = self.length;
const delta_length = new_length - old_length;
const data_bytes = new_capacity * slot_size;
const first_slot = allocateWithRefcount(allocator, alignment, data_bytes);
const data_bytes = new_length * element_width;
const first_slot = utils.allocateWithRefcount(allocator, alignment, data_bytes);
// transfer the memory
if (self.bytes) |source_ptr| {
const dest_ptr = first_slot;
@memcpy(dest_ptr, source_ptr, old_length);
@memcpy(dest_ptr, source_ptr, old_length * element_width);
}
// NOTE the newly added elements are left uninitialized
const result = RocList{
.dict_bytes = first_slot,
.bytes = first_slot,
.length = new_length,
};
@ -324,3 +324,16 @@ pub fn listRepeat(count: usize, alignment: usize, element: Opaque, element_width
unreachable;
}
}
pub fn listAppend(list: RocList, alignment: usize, element: Opaque, element_width: usize) callconv(.C) RocList {
const old_length = list.len();
var output = list.reallocate(std.heap.c_allocator, alignment, old_length + 1, element_width);
if (output.bytes) |target| {
if (element) |source| {
@memcpy(target + old_length * element_width, source, element_width);
}
}
return output;
}