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free or reuse unconditionally when value is unique

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Folkert 2023-06-27 17:33:53 +02:00
parent e3ab023f62
commit fc3004da58
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21 changed files with 381 additions and 69 deletions
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34
crates/compiler/builtins/bitcode/src/utils.zig
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@ -220,6 +220,29 @@ pub fn increfDataPtrC(
return increfRcPtrC(isizes, inc_amount);
}
pub fn freeDataPtrC(
bytes_or_null: ?[*]isize,
alignment: u32,
) callconv(.C) void {
var bytes = bytes_or_null orelse return;
const ptr = @ptrToInt(bytes);
const tag_mask: usize = if (@sizeOf(usize) == 8) 0b111 else 0b11;
const masked_ptr = ptr & ~tag_mask;
const isizes: [*]isize = @intToPtr([*]isize, masked_ptr);
return freeRcPtrC(isizes - 1, alignment);
}
pub fn freeRcPtrC(
bytes_or_null: ?[*]isize,
alignment: u32,
) callconv(.C) void {
var bytes = bytes_or_null orelse return;
return free_ptr_to_refcount(bytes, alignment);
}
pub fn decref(
bytes_or_null: ?[*]u8,
data_bytes: usize,
@ -236,6 +259,17 @@ pub fn decref(
decref_ptr_to_refcount(isizes - 1, alignment);
}
inline fn free_ptr_to_refcount(
refcount_ptr: [*]isize,
alignment: u32,
) void {
if (RC_TYPE == Refcount.none) return;
const extra_bytes = std.math.max(alignment, @sizeOf(usize));
// NOTE: we don't even check whether the refcount is "infinity" here!
dealloc(@ptrCast([*]u8, refcount_ptr) - (extra_bytes - @sizeOf(usize)), alignment);
}
inline fn decref_ptr_to_refcount(
refcount_ptr: [*]isize,
alignment: u32,