0.26.0

This is another TinyGo release with many small changes, including over 110 commits.

This release introduces two possible breaking changes:

1. The machine package has had some changes in the public API, to remove some unintentionally exported constants. It is likely that very little real-world code is affected by this change.

2. WebAssembly files could previously import functions by leaving a Go function unimplemented, like so:

   func add(a, b int) int

   This worked by accident. With this release, this is no longer possible. Instead, functions will need to be imported explicitly to avoid a compiler error:

   //export add
   func add(a, b int) int

   (The //export may be confusing, we intend to add a less-confusing //go:wasm-import directive in the future).

Here is a detailed changelog for this release:

• general
  • remove support for LLVM 13
  • remove calls to deprecated ioutil package
  • move from os.IsFoo to errors.Is(err, ErrFoo)
  • fix for builds using an Android host
  • make interp timeout configurable from command line
  • ignore ports with VID/PID if there is no candidates
  • drop support for Go 1.16 and Go 1.17
  • update serial package to v1.3.5 for latest bugfixes
  • remove GOARM from tinygo info
  • add flag for setting the goroutine stack size
  • add serial port monitoring functionality
• compiler
  • cgo: implement support for static functions
  • cgo: fix panic when FuncType.Results is nil
  • compiler: add aliases for edwards25519/field.feMul and field.feSquare
  • compiler: fix incorrect DWARF type in some generic parameters
  • compiler: use LLVM math builtins everywhere
  • compiler: replace some math operation bodies with LLVM intrinsics
  • compiler: replace math aliases with intrinsics
  • compiler: fix unsafe.Sizeof for chan and map values
  • compileopts: use tags parser from buildutil
  • compileopts: use backticks for regexp to avoid extra escapes
  • compileopts: fail fast on duplicate values in target field slices
  • compileopts: fix windows/arm target triple
  • compileopts: improve error handling when loading target/*.json
  • compileopts: add support for stlink-dap programmer
  • compileopts: do not complain about -no-debug on MacOS
  • goenv: support GOOS=android
  • interp: fix reading from external global
  • loader: fix link error for crypto/internal/boring/sig.StandardCrypto
• standard library
  • rename assembly files to .S extension
  • machine: add PWM peripheral comments to pins
  • machine: improve UARTParity slightly
  • machine: do not export DFU_MAGIC_* constants on nrf52840
  • machine: rename PinInputPullUp/PinInputPullDown
  • machine: add KHz, MHz, GHz constants, deprecate TWI_FREQ_* constants
  • machine: remove level triggered pin interrupts
  • machine: do not expose RESET_MAGIC_VALUE
  • machine: use NoPin constant where appropriate (instead of 0 for example)
  • net: sync net.go with Go 1.18 stdlib
  • os: add SyscallError.Timeout
  • os: add ErrProcessDone error
  • reflect: implement CanInterface and fix string Index
  • runtime: make MemStats available to leaking collector
  • runtime: add MemStats.TotalAlloc
  • runtime: add MemStats.Mallocs and Frees
  • runtime: add support for time.NewTimer and time.NewTicker
  • runtime: implement resetTimer
  • runtime: ensure some headroom for the GC to run
  • runtime: make gc and scheduler asserts settable with build tags
  • runtime/pprof: add WriteHeapProfile
  • runtime/pprof: runtime/trace: stub some additional functions
  • sync: implement Map.LoadAndDelete
  • syscall: group WASI consts by purpose
  • syscall: add WASI {D,R}SYNC, NONBLOCK FD flags
  • syscall: add ENOTCONN on darwin
  • testing: add support for -benchmem
• targets
  • remove USB vid/pid pair of bootloader
  • esp32c3: remove unused UARTStopBits constants
  • nrf: implement GetRNG function
  • nrf: rp2040: add machine.ReadTemperature
  • nrf52: cleanup s140v6 and s140v7 uf2 targets
  • rp2040: implement semi-random RNG based on ROSC based on pico-sdk
  • wasm: add summary of wasm examples and fix callback bug
  • wasm: do not allow undefined symbols (--allow-undefined)
  • wasm: make sure buffers returned by malloc are kept until free is called
  • windows: save and restore xmm registers when switching goroutines
• boards
  • add Pimoroni's Tufty2040
  • add XIAO ESP32C3
  • add Adafruit QT2040
  • add Adafruit QT Py RP2040
  • esp32c3-12f: matrixportal-m4: p1am-100: remove duplicate build tags
  • hifive1-qemu: remove this emulated board
  • wioterminal: add UART3 for RTL8720DN
  • xiao-ble: fix usbpid