C malloc storage has explicit lifetime: it must remain allocated until
free even when no GC-visible pointer references it. Treating it as an
ordinary NoPtrs allocation breaks bare-metal C object graphs, while
conservatively scanning arbitrary C bytes creates false Go roots.
Add allocManual/freeManual so collectors can represent pointer-free,
explicitly managed storage. Block GC keeps these objects permanently
marked and releases their blocks on free; Boehm uses atomic uncollectable
allocations; leaking and custom collectors provide equivalent behavior.
Wasm keeps its allocation map only for validation and sizes, and WASIp2
realloc now copies min(oldSize, newSize).
Bump the Boehm library cache version because enabling atomic
uncollectable allocations changes its compiled flags and exported API.
Also handle zero-size and overflowing allocations, serialize allocation
registries, reject Go finalizers on manual storage, and add CGo regressions
for C pointer graphs, hidden until-free allocations, repeated free/reuse,
and allocation edge cases.
This is a small release just in time for GopherCon US.
Some of the big changes of this release are:
- switch to LLVM 16
- fixes for two separate hard-to-reproduce compiler crashes
- added support for the Adafruit Gemma M0
These are some major or breaking changes:
- Reflect support got improved a lot.
- Interrupts became more strict: heap allocations an blocking
operations, which have always been undefined behavior, now result in
a panic.
- `//go:wasmimport` was added
- various new flags were added to `tinygo test`
- the source location for panics is printed in the `-monitor` output
This release contains a small fix for some atsamd21-based boards to make
them usable on macOS: it now allows to specify the serial port using the
-port flag.
Jake Bailey
deadprogram
Ayke van Laethem
Dan Kegel
shivay