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refcount details of builtins

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Folkert 2021-02-19 17:13:09 +01:00
parent 9e2c1b750f
commit 17fddaf0dd
7 changed files with 50 additions and 20 deletions
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18
compiler/builtins/bitcode/src/utils.zig
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@ -16,25 +16,25 @@ pub fn decref(
var bytes = bytes_or_null orelse return;
const usizes: [*]usize = @ptrCast([*]usize, @alignCast(8, bytes));
const isizes: [*]isize = @ptrCast([*]isize, @alignCast(8, bytes));
const refcount = (usizes - 1)[0];
const refcount = (isizes - 1)[0];
const refcount_isize = @bitCast(isize, refcount);
switch (alignment) {
16 => {
if (refcount == REFCOUNT_ONE) {
if (refcount == REFCOUNT_ONE_ISIZE) {
allocator.free((bytes - 16)[0 .. 16 + data_bytes]);
} else if (refcount_isize < 0) {
(usizes - 1)[0] = refcount + 1;
(isizes - 1)[0] = refcount - 1;
}
},
else => {
// NOTE enums can currently have an alignment of < 8
if (refcount == REFCOUNT_ONE) {
if (refcount == REFCOUNT_ONE_ISIZE) {
allocator.free((bytes - 8)[0 .. 8 + data_bytes]);
} else if (refcount_isize < 0) {
(usizes - 1)[0] = refcount + 1;
(isizes - 1)[0] = refcount - 1;
}
},
}
@ -72,11 +72,11 @@ pub fn allocateWithRefcount(
var new_bytes: []align(8) u8 = allocator.alignedAlloc(u8, 8, length) catch unreachable;
var as_usize_array = @ptrCast([*]usize, new_bytes);
var as_usize_array = @ptrCast([*]isize, new_bytes);
if (result_in_place) {
as_usize_array[0] = @intCast(usize, number_of_slots);
as_usize_array[0] = @intCast(isize, number_of_slots);
} else {
as_usize_array[0] = REFCOUNT_ONE;
as_usize_array[0] = REFCOUNT_ONE_ISIZE;
}
var as_u8_array = @ptrCast([*]u8, new_bytes);