TinyGo Files

This release adds support for //go:wasmexport that is a standardized way to export WebAssembly functions to the host, improves garbage collection performance (especially on wasm), adds big-endian MIPS support (GOOS=mips), and adds two new boards! It also contains a number of smaller improvements and bug fixes.

• general
• fix GOOS=wasip1 for tinygo test
• add -C DIR flag
• add initial documentation for project governance
• add -ldflags='-extldflags=...' support
• improve usage message with tinygo help and when passing invalid parameters
• compiler
• builder: remove environment variables when invoking Clang, to avoid the environment changing the behavior
• builder: check for the Go toolchain version used to compile TinyGo
• cgo: add C.CBytes implementation
• compiler: fix passing weirdly-padded structs as parameters to new goroutines
• compiler: support pragmas on generic functions
• compiler: do not let the slice buffer escape when casting a []byte or []rune to a string, to help escape analysis
• compiler: conform to the latest iteration of the wasm types proposal
• loader: don't panic when main package is not named 'main'
• loader: make sure we always return type checker errors even without type errors
• transform: optimize range over []byte(string)
• standard library
• crypto/x509: add package stub to build crypto/x509 on macOS
• machine/usb/adc/midi: fix PitchBend
• os: add Truncate stub for baremetal
• os: add stubs for os.File deadlines
• os: add internal net.newUnixFile for the net package
• runtime: stub runtime_{Before,After}Exec for linkage
• runtime: randomize map accesses
• runtime: support maps.Clone
• runtime: add more fields to MemStats
• runtime: implement newcoro, coroswitch to support package iter
• runtime: disallow defer in interrupts
• runtime: add support for os/signal on Linux and MacOS
• runtime: add gc layout info for some basic types to help the precise GC
• runtime: bump GC mark stack size to avoid excessive heap rescans
• targets
• darwin: use Go standard library syscall package instead of a custom one
• fe310: support GPIO PinInput
• mips: fix compiler crash with GOMIPS=softfloat and defer
• mips: add big-endian (GOARCH=mips) support
• mips: use MIPS32 (instead of MIPS32R2) as the instruction set for wider compatibility
• wasi: add relative and absolute --dir options to wasmtime args
• wasip2: add wasmtime -S args to support network interfaces
• wasm: add //go:wasmexport support (for all WebAssembly targets)
• wasm: use precise instead of conservative GC for WebAssembly (including WASI)
• wasm-unknown: add bulk memory flags since basically every runtime has it now
• boards
• add RAKwireless RAK4631
• add WaveShare ESP-C3-32S-Kit