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lowlevel isUnique

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J.Teeuwissen 2023-04-26 17:23:10 +02:00
parent 2435bdb41a
commit ed46a1f2cb
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8 changed files with 28 additions and 1 deletions
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1
crates/compiler/builtins/bitcode/src/main.zig
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@ -174,6 +174,7 @@ comptime {
exportUtilsFn(utils.test_panic, "test_panic");
exportUtilsFn(utils.increfC, "incref");
exportUtilsFn(utils.decrefC, "decref");
exportUtilsFn(utils.isUnique, "is_unique");
exportUtilsFn(utils.decrefCheckNullC, "decref_check_null");
exportUtilsFn(utils.allocateWithRefcountC, "allocate_with_refcount");

16
crates/compiler/builtins/bitcode/src/utils.zig
View file

@ -231,6 +231,22 @@ inline fn decref_ptr_to_refcount(
}
}
pub export fn isUnique(
bytes_or_null: ?[*]u8,
) bool {
var bytes = bytes_or_null orelse return true;
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);
const refcount = (isizes - 1)[0];
return refcount == REFCOUNT_ONE_ISIZE;
}
// We follow roughly the [fbvector](https://github.com/facebook/folly/blob/main/folly/docs/FBVector.md) when it comes to growing a RocList.
// Here is [their growth strategy](https://github.com/facebook/folly/blob/3e0525988fd444201b19b76b390a5927c15cb697/folly/FBVector.h#L1128) for push_back:
//

1
crates/compiler/builtins/src/bitcode.rs
View file

@ -377,6 +377,7 @@ pub const UTILS_TEST_PANIC: &str = "roc_builtins.utils.test_panic";
pub const UTILS_ALLOCATE_WITH_REFCOUNT: &str = "roc_builtins.utils.allocate_with_refcount";
pub const UTILS_INCREF: &str = "roc_builtins.utils.incref";
pub const UTILS_DECREF: &str = "roc_builtins.utils.decref";
pub const UTILS_IS_UNIQUE: &str = "roc_builtins.utils.is_unique";
pub const UTILS_DECREF_CHECK_NULL: &str = "roc_builtins.utils.decref_check_null";
pub const UTILS_EXPECT_FAILED_START_SHARED_BUFFER: &str =