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Create new lowlevels for refcounting

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Brian Carroll 2021-11-24 16:07:31 +00:00
parent c8278dcb1c
commit 6e5acadfea
7 changed files with 34 additions and 0 deletions
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20
compiler/builtins/bitcode/src/utils.zig
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@ -104,6 +104,12 @@ pub const IntWidth = enum(u8) {
I128 = 9,
};
pub fn increfC(ptr_to_refcount: *isize, amount: isize) callconv(.C) void {
var refcount = ptr_to_refcount.*;
var masked_amount = if (refcount == REFCOUNT_MAX_ISIZE) 0 else amount;
ptr_to_refcount.* = refcount + masked_amount;
}
pub fn decrefC(
bytes_or_null: ?[*]isize,
alignment: u32,
@ -261,3 +267,17 @@ pub const UpdateMode = enum(u8) {
Immutable = 0,
InPlace = 1,
};
test "increfC, refcounted data" {
var mock_rc: isize = REFCOUNT_ONE_ISIZE + 17;
var ptr_to_refcount: *isize = &mock_rc;
increfC(ptr_to_refcount, 2);
try std.testing.expectEqual(mock_rc, REFCOUNT_ONE_ISIZE + 19);
}
test "increfC, static data" {
var mock_rc: isize = REFCOUNT_MAX_ISIZE;
var ptr_to_refcount: *isize = &mock_rc;
increfC(ptr_to_refcount, 2);
try std.testing.expectEqual(mock_rc, REFCOUNT_MAX_ISIZE);
}