github.com/tinygo-org/tinygo

• command line
  • remove support for go 1.15
  • remove support for LLVM 11 and LLVM 12
  • add initial Go 1.19 beta support
  • test: fix package/... syntax
• compiler
  • add support for the embed package
  • builder: improve error message for "command not found"
  • builder: add support for ThinLTO on MacOS and Windows
  • builder: free LLVM objects after use, to reduce memory leaking
  • builder: improve -no-debug error messages
  • cgo: be more strict: CGo now requires every Go file to import the headers it needs
  • compiler: alignof(func) is 1 pointer, not 2
  • compiler: add support for type parameters (aka generics)
  • compiler: implement recover() built-in function
  • compiler: support atomic, volatile, and LLVM memcpy-like functions in defer
  • compiler: drop support for macos syscalls via inline assembly
  • interp: do not try to interpret past task.Pause()
  • interp: fix some buggy localValue handling
  • interp: do not unroll loops
  • transform: fix MakeGCStackSlots that caused a possible GC bug on WebAssembly
• standard library
  • os: enable os.Stdin for baremetal target
  • reflect: add Value.UnsafePointer method
  • runtime: scan GC globals conservatively on Windows, MacOS, Linux and Nintendo Switch
  • runtime: add per-map hash seeds
  • runtime: handle nil map write panics
  • runtime: add stronger hash functions
  • syscall: implement Getpagesize
• targets
  • atmega2560: support UART1-3 + example for uart
  • avr: use compiler-rt for improved float64 support
  • avr: simplify timer-based time
  • avr: fix race condition in stack write
  • darwin: add support for GOARCH=arm64 (aka Apple Silicon)
  • darwin: support -size=short and -size=full flag
  • rp2040: replace sleep 'busy loop' with timer alarm
  • rp2040: align api for PortMaskSet, PortMaskClear
  • rp2040: fix GPIO interrupts
  • samd21, samd51, nrf52840: add support for USBHID (keyboard / mouse)
  • wasm: update wasi-libc version
  • wasm: use newer WebAssembly features
• boards
  • add Badger 2040
  • matrixportal-m4: attach USB DP to the correct pin
  • teensy40: add I2C support
  • wioterminal: fix I2C definition

• command line
  • add -work flag
  • add Go 1.18 support
  • add LLVM 14 support
  • run: add support for command-line parameters
  • build: calculate default output path if -o is not specified
  • build: add JSON output
  • test: support multiple test binaries with -c
  • test: support flags like -v on all targets (including emulated firmware)
• compiler
  • add support for ThinLTO
  • use compiler-rt from LLVM
  • builder: prefer GNU build ID over Go build ID for caching
  • builder: add support for cross compiling to Darwin
  • builder: support machine outlining pass in stacksize calculation
  • builder: disable asynchronous unwind tables
  • compileopts: fix emulator configuration on non-amd64 Linux architectures
  • compiler: move allocations > 256 bytes to the heap
  • compiler: fix incorrect unsafe.Alignof on some 32-bit architectures
  • compiler: accept alias for slice cap builtin
  • compiler: allow slices of empty structs
  • compiler: fix difference in aliases in interface methods
  • compiler: make RawSyscall an alias for Syscall
  • compiler: remove support for memory references in AsmFull
  • loader: only add Clang header path for CGo
  • transform: fix poison value in heap-to-stack transform
• standard library
  • internal/fuzz: add this package as a shim
  • os: implement readdir for darwin and linux
  • os: add DirFS, which is used by many programs to access readdir.
  • os: isWine: be compatible with older versions of wine, too
  • os: implement RemoveAll
  • os: Use a uintptr for NewFile
  • os: add stubs for exec.ExitError and ProcessState.ExitCode
  • os: export correct values for DevNull for each OS
  • os: improve support for Signal by fixing various bugs
  • os: implement File.Fd method
  • os: implement UserHomeDir
  • os: add exec.ProcessState stub
  • os: implement Pipe for darwin
  • os: define stub ErrDeadlineExceeded
  • reflect: add stubs for more missing methods
  • reflect: rename reflect.Ptr to reflect.Pointer
  • reflect: add Value.FieldByIndexErr stub
  • runtime: fix various small GC bugs
  • runtime: use memzero for leaking collector instead of manually zeroing objects
  • runtime: implement memhash
  • runtime: implement fastrand
  • runtime: add stub for debug.ReadBuildInfo
  • runtime: add stub for NumCPU
  • runtime: don't inline runtime.alloc with -gc=leaking
  • runtime: add Version
  • runtime: add stubs for NumCgoCall and NumGoroutine
  • runtime: stub {Lock,Unlock}OSThread on Windows
  • runtime: be able to deal with a very small heap
  • syscall: make Environ return a copy of the environment
  • syscall: implement getpagesize and munmap
  • syscall: wasi: define MAP_SHARED and PROT_READ
  • syscall: stub mmap(), munmap(), MAP_SHARED, PROT_READ, SIGBUS, etc. on nonhosted targets
  • syscall: darwin: more complete list of signals
  • syscall: wasi: more complete list of signals
  • syscall: stub WaitStatus
  • syscall/js: allow copyBytesTo(Go|JS) to use Uint8ClampedArray
  • testing: implement TempDir
  • testing: nudge type TB closer to upstream; should be a no-op change.
  • testing: on baremetal platforms, use simpler test matcher
• targets
  • atsamd: fix usbcdc initialization when -serial=uart
  • atsamd51: allow higher frequency when using SPI
  • esp: support CGo
  • esp32c3: add support for input pin
  • esp32c3: add support for GPIO interrupts
  • esp32c3: add support to receive UART data
  • rp2040: fix PWM bug at high frequency
  • rp2040: fix some minor I2C bugs
  • rp2040: fix incorrect inline assembly
  • rp2040: fix spurious i2c STOP during write+read transaction
  • rp2040: improve ADC support
  • wasi: remove --export-dynamic linker flag
  • wasm: remove heap allocator from wasi-libc
• boards
  • circuitplay-bluefruit: move pin mappings so board can be compiled for WASM use in Playground
  • esp32-c3-12f: add the ESP32-C3-12f Kit
  • m5stamp-c3: add pin setting of UART
  • macropad-rp2040: add the Adafruit MacroPad RP2040 board
  • nano-33-ble: typo in LPS22HB peripheral definition and documentation (#2579)
  • teensy41: add the Teensy 4.1 board
  • teensy40: add ADC support
  • teensy40: add SPI support
  • thingplus-rp2040: add the SparkFun Thing Plus RP2040 board
  • wioterminal: add DefaultUART
  • wioterminal: verify written data when flashing through OpenOCD
  • xiao-ble: add XIAO BLE nRF52840 support

• command line
  • add asyncify to scheduler flag help
  • support -run for tests
  • remove FreeBSD target support
  • add LLVM 12 and LLVM 13 support, use LLVM 13 by default
  • add support for ARM64 MacOS
  • improve help
  • check /run/media as well as /media on Linux for non-debian-based distros
  • test: set cmd.Dir even when running emulators
  • info: add JSON output using the -json flag
• compiler
  • builder: fix off-by-one in size calculation
  • builder: handle concurrent library header rename
  • builder: use flock to avoid double-compiles
  • builder: use build ID as cache key
  • builder: add -fno-stack-protector to musl build
  • builder: update clang header search path to look in /usr/lib
  • builder: explicitly disable unwind tables for ARM
  • cgo: add support for C.CString and related functions
  • compiler: fix ranging over maps with particular map types
  • compiler: add correct debug location to init instructions
  • compiler: fix emission of large object layouts
  • compiler: work around AVR atomics bugs
  • compiler: predeclare runtime.trackPointer
  • interp: work around AVR function pointers in globals
  • interp: run goroutine starts and checks at runtime
  • interp: always run atomic and volatile loads/stores at runtime
  • interp: bump timeout to 180 seconds
  • interp: handle type assertions on nil interfaces
  • loader: eliminate goroot cache inconsistency
  • loader: respect $GOROOT when running go list
  • transform: allocate the correct amount of bytes in an alloca
  • transform: remove switched func lowering
• standard library
  • crypto/rand: show error if platform has no rng
  • device/*: add *_Msk field for each bit field and avoid duplicates
  • device/*: provide Set/Get for each register field described in the SVD files
  • internal/task: swap stack chain when switching goroutines
  • internal/task: remove -scheduler=coroutines
  • machine: add Device string constant
  • net: add bare Interface implementation
  • net: add net.Buffers
  • os: stub out support for some features
  • os: obey TMPDIR on unix, TMP on Windows, etc
  • os: implement ReadAt, Mkdir, Remove, Stat, Lstat, CreateTemp, MkdirAll, Chdir, Chmod, Clearenv, Unsetenv, Setenv, MkdirTemp, Rename, Seek, ExpandEnv, Symlink, Readlink
  • os: implement File.Stat
  • os: fix IsNotExist on nonexistent path
  • os: fix opening files on WASI in read-only mode
  • os: work around lack of syscall.seek on 386 and arm
  • reflect: make sure indirect pointers are handled correctly
  • runtime: allow comparing interfaces
  • runtime: use LLVM intrinsic to read the stack pointer
  • runtime: strengthen hashmap hash function for structs and arrays
  • runtime: fix float/complex hashing
  • runtime: fix nil map dereference
  • runtime: add realloc implementation to GCs
  • runtime: handle negative sleep times
  • runtime: correct GC scan bounds
  • runtime: remove extalloc GC
  • rumtime: implement __sync libcalls as critical sections for most microcontrollers
  • runtime: add stubs for Func.FileLine and Frame.PC
  • sync: fix concurrent read-lock on write-locked RWMutex
  • sync: add a package doc
  • sync: add tests
  • syscall: add support for Mmap and Mprotect
  • syscall: fix array size for mmap slice creation
  • syscall: enable Getwd in wasi
  • testing: add a stub for CoverMode
  • testing: support -bench option to run benchmarks matching the given pattern.
  • testing: support b.SetBytes(); implement sub-benchmarks.
  • testing: replace spaces with underscores in test/benchmark names, as upstream does
  • testing: implement testing.Cleanup
  • testing: allow filtering subbenchmarks with the -bench flag
  • testing: implement -benchtime flag
  • testing: print duration
  • testing: allow filtering of subtests using -run
• targets
  • all: change LLVM features to match vanilla Clang
  • avr: use interrupt-based timer which is much more accurate
  • nrf: fix races in I2C
  • samd51: implement TRNG for randomness
  • stm32: pull-up on I2C lines
  • stm32: fix timeout for i2c comms
  • stm32f4, stm32f103: initial implementation for ADC
  • stm32f4, stm32f7, stm32l0x2, stm32l4, stm32l5, stm32wl: TRNG implementation in crypto/rand
  • stm32wl: add I2C support
  • windows: add support for the -size= flag
  • wasm: add support for tinygo test
  • wasi, wasm: raise default stack size to 16 KiB
• boards
  • add M5Stack
  • add lorae5 (stm32wle) support
  • add Generic Node Sensor Edition
  • add STM32F469 Discovery
  • add M5Stamp C3
  • add Blues Wireless Swan
  • bluepill: add definitions for ADC pins
  • stm32f4disco: add definitions for ADC pins
  • stm32l552ze: use supported stlink interface
  • microbit-v2: add some pin definitions

• command line
  • drop support for LLVM 10
  • build: drop support for LLVM targets in the -target flag
  • build: fix paths in error messages on Windows
  • build: add -p flag to set parallelism
  • lldb: implement tinygo lldb subcommand
  • test: use emulator exit code instead of parsing test output
  • test: pass testing arguments to wasmtime
• compiler
  • use -opt flag for optimization level in CFlags (-Os, etc)
  • builder: improve accuracy of the -size=full flag
  • builder: hardcode some more frame sizes for _aeabi* functions
  • builder: add support for -size= flag for WebAssembly
  • cgo: fix line/column reporting in syntax error messages
  • cgo: support function definitions in CGo headers
  • cgo: implement rudimentary C array decaying
  • cgo: add support for stdio in picolibc and wasi-libc
  • cgo: run CGo parser per file, not per CGo fragment
  • compiler: fix unintentionally exported math functions
  • compiler: properly implement div and rem operations
  • compiler: add support for recursive function types
  • compiler: add support for the go keyword on interface methods
  • compiler: add minsize attribute for -Oz
  • compiler: add "target-cpu" and "target-features" attributes
  • compiler: fix indices into strings and arrays
  • compiler: fix string compare functions
  • interp: simplify some code to avoid some errors
  • interp: support recursive globals (like linked lists) in globals
  • interp: support constant globals
  • interp: fix reverting of extractvalue/insertvalue with multiple indices
  • transform: work around renamed return type after merging LLVM modules
• standard library
  • internal/bytealg: fix indexing error in Compare()
  • machine: support Pin.Get() function when the pin is configured as output
  • net, syscall: Reduce code duplication by switching to internal/itoa.
  • os: don't try to read executable path on baremetal
  • os: implement Getwd
  • os: add File.WriteString and File.WriteAt
  • reflect: fix type.Size() to account for struct padding
  • reflect: don't construct an interface-in-interface value
  • reflect: implement Value.Elem() for interface values
  • reflect: fix Value.Index() in a specific case
  • reflect: add support for DeepEqual
  • runtime: add another set of invalid unicode runes to encodeUTF8()
  • runtime: only initialize os.runtime_args when needed
  • runtime: only use CRLF on baremetal systems for println
  • runtime/debug: stub debug.SetMaxStack
  • runtime/debug: stub debug.Stack
  • testing: add a stub for t.Parallel()
  • testing: add support for -test.short flag
  • testing: stub B.ReportAllocs()
  • testing: add testing.Verbose
  • testing: stub testing.AllocsPerRun
• targets
  • fix gen-device-svd to handle 64-bit values
  • add CPU and Features property to all targets
  • match LLVM triple to the one Clang uses
  • atsam: simplify definition of SERCOM UART, I2C and SPI peripherals
  • atsam: move I2S0 to machine file
  • esp32: fix SPI configuration
  • esp32c3: add support for GDB debugging
  • esp32c3: add support for CPU interrupts
  • esp32c3: use tasks scheduler by default
  • fe310: increase CPU frequency from 16MHz to 320MHz
  • fe310: add support for bit banging drivers
  • linux: build static binaries using musl
  • linux: reduce binary size by calling write instead of putchar
  • linux: add support for GOARM
  • riscv: implement 32-bit atomic operations
  • riscv: align the heap to 16 bytes
  • riscv: switch to tasks-based scheduler
  • rp2040: add CPUFrequency()
  • rp2040: improve I2C baud rate configuration
  • rp2040: add pin interrupt API
  • rp2040: refactor PWM code and fix Period calculation
  • stm32f103: fix SPI
  • stm32f103: make SPI frequency selection more flexible
  • qemu: signal correct exit code to QEMU
  • wasi: run C/C++ constructors at startup
  • wasm: ensure heapptr is aligned
  • wasm: update wasi-libc dependency
  • wasm: wasi: use asyncify
  • wasm: support -scheduler=none
  • windows: add support for Windows (amd64 only for now)
• boards
  • feather-stm32f405, feather-rp2040: add I2C pin names
  • m5stack-core2: add M5Stack Core2
  • nano-33-ble: SoftDevice s140v7 support
  • nano-33-ble: add constants for more on-board pins

• command line
  • add support for Go 1.17
  • improve Go version detection
  • add support for the Black Magic Probe (BMP)
  • add a flag for creating cpu profiles
• compiler
  • builder: list libraries at the end of the linker command
  • builder: strip debug information at link time instead of at compile time
  • builder: add missing error check for ioutil.TempFile()
  • builder: simplify running of jobs
  • compiler: move LLVM math builtin support into the compiler
  • compiler: move math aliases from the runtime to the compiler
  • compiler: add aliases for many hashing packages
  • compiler: add *ssa.MakeSlice bounds tests
  • compiler: fix max possible slice
  • compiler: add support for new language features of Go 1.17
  • compiler: fix equally named structs in different scopes
  • compiler: avoid zero-sized alloca in channel operations
  • interp: don't ignore array indices for untyped objects
  • interp: keep reverted package initializers in order
  • interp: fix bug in compiler-time/run-time package initializers
  • loader: fix panic in CGo files with syntax errors
  • transform: improve GC stack slot pass to work around a bug
• standard library
  • crypto/rand: switch to arc4random_buf
  • math: fix math.Max and math.Min
  • math/big: fix undefined symbols error
  • net: add MAC address implementation
  • os: implement os.Executable
  • os: add SEEK_SET, SEEK_CUR, and SEEK_END
  • reflect: add StructField.IsExported method
  • runtime: reset heapptr to heapStart after preinit()
  • runtime: add subsections_via_symbols to assembly files on darwin
  • testing: add subset implementation of Benchmark
  • testing: test testing package using tinygo test
  • testing: add support for the -test.v flag
• targets
  • 386: bump minimum requirement to the Pentium 4
  • arm: switch to Thumb instruction set on ARM
  • atsamd: fix copy-paste error for atsamd21/51 calibTrim block
  • baremetal,wasm: support command line params and environment variables
  • cortexm: fix stack overflow because of unaligned stacks
  • esp32c3: add support for the ESP32-C3 from Espressif
  • nrf52840: fix ram size
  • nxpmk66f18: fix a suspicious bitwise operation
  • rp2040: add SPI support
  • rp2040: add I2C support
  • rp2040: add PWM implementation
  • rp2040: add openocd configuration
  • stm32: add support for PortMask* functions for WS2812 support
  • unix: fix time base for time.Now()
  • unix: check for mmap error and act accordingly
  • wasm: override dlmalloc heap implementation from wasi-libc
  • wasm: align heap to 16 bytes
  • wasm: add support for the crypto/rand package
• boards
  • add DefaultUART to adafruit boards
  • arduino-mkrwifi1010: add board definition for Arduino MKR WiFi 1010
  • arduino-mkrwifi1010: fix pin definition of NINA_RESETN
  • feather-nrf52: fix pin definition of uart
  • feather-rp2040: add pin name definition
  • gameboy-advance: fix ROM header
  • mdbt50qrx-uf2: add Raytac MDBT50Q-RX Dongle with TinyUF2
  • nano-rp2040: define NINA_SPI and fix wifinina pins
  • teensy40: enable hardware UART reconfiguration, fix receive watermark interrupt

• command line
  • don't consider compile-only tests as failing
  • add -test flag for tinygo list
  • escape commands while printing them with the -x flag
  • make flash-command portable and safer to use
  • use extended-remote instead of remote in GDB
  • detect specific serial port IDs based on USB vid/pid
  • add a flag to the command line to select the serial implementation
• compiler
  • cgo: improve constant parser
  • compiler: support chained interrupt handlers
  • compiler: add support for running a builtin in a goroutine
  • compiler: do not emit nil checks for loading closure variables
  • compiler: skip context parameter when starting regular goroutine
  • compiler: refactor method names
  • compiler: add function and global section pragmas
  • compiler: implement syscall.rawSyscallNoError in inline assembly
  • interp: ignore inline assembly in markExternal
  • interp: fix a bug in pointer cast workaround
  • loader: fix testing a main package
• standard library
  • crypto/rand: replace this package with a TinyGo version
  • machine: make USBCDC global a pointer
  • machine: make UART objects pointer receivers
  • machine: define Serial as the default output
  • net: add initial support for net.IP
  • net: add more net compatibility
  • os: add stub for os.ReadDir
  • os: add FileMode constants from Go 1.16
  • os: add stubs required for net/http
  • os: implement process related functions
  • reflect: implement AppendSlice
  • reflect: add stubs required for net/http
  • runtime: make task.Data a 64-bit integer to avoid overflow
  • runtime: expose memory stats
  • sync: implement NewCond
  • syscall: fix int type in libc version
• targets
  • cortexm: do not disable interrupts on abort
  • cortexm: bump default stack size to 2048 bytes
  • nrf: avoid heap allocation in waitForEvent
  • nrf: don't trigger a heap allocation in SPI.Transfer
  • nrf52840: add support for flashing with the BOSSA tool
  • rp2040: add support for GPIO input
  • rp2040: add basic support for ADC
  • rp2040: gpio and adc pin definitions
  • rp2040: implement UART
  • rp2040: patch elf to checksum 2nd stage boot
  • stm32: add PWM for most chips
  • stm32: add support for pin interrupts
  • stm32f103: add support for PinInputPullup / PinInputPulldown
  • wasi: remove wasm build tag
• boards
  • feather-rp2040: add support for this board
  • feather-nrf52840-sense: add board definition for this board
  • pca10059: support flashing from Windows
  • nano-rp2040: add this board
  • nano-33-ble: add support for this board
  • pico: add the Raspberry Pi Pico board with the new RP2040 chip
  • qtpy: add pin for neopixels
  • all: add definition for ws2812 for supported boards

• command line
  • drop support for Go 1.11 and 1.12
  • throw an error when no target is specified on Windows
  • improve error messages in getDefaultPort(), support for multiple ports
  • remove -cflags and -ldflags flags
  • implement -ldflags="-X ..."
  • add -print-allocs flag that lets you print all heap allocations
  • openocd commands in tinygo command line
  • add -llvm-features parameter
  • match go test output
  • discover USB ports only, this will ignore f.ex. bluetooth
  • use physicmal path instead of cached GOROOT in function getGoroot
  • add goroot for snap installs
• compiler
  • builder: add support for -opt=0
  • builder, compiler: compile and cache packages in parallel
  • builder: run interp per package
  • builder: cache C and assembly file outputs
  • builder: add support for -x flag to print commands
  • builder: add optsize attribute while building the package
  • builder: run function passes per package
  • builder: hard code Clang compiler
  • compiler: do not use llvm.GlobalContext()
  • compiler: remove SimpleDCE pass
  • compiler: do not emit nil checks for *ssa.Alloc instructions
  • compiler: merge runtime.typecodeID and runtime.typeInInterface
  • compiler: do not check for impossible type asserts
  • compiler: fix use of global context: llvm.Int32Type()
  • compiler: add interface IR test
  • compiler: fix lack of method name in interface matching
  • compiler: fix "fragment covers entire variable" bug
  • compiler: optimize string literals and globals
  • compiler: decouple func lowering from interface type codes
  • compiler: add function attributes to some runtime calls
  • compiler: improve position information in error messages
  • cgo: add support for CFLAGS in .c files
  • interp: support GEP on fixed (MMIO) addresses
  • interp: handle (reflect.Type).Elem()
  • interp: add support for runtime.interfaceMethod
  • interp: make toLLVMValue return an error instead of panicking
  • interp: add support for switch statement
  • interp: fix phi instruction
  • interp: remove map support
  • interp: support extractvalue/insertvalue with multiple operands
  • transform: optimize string comparisons against ""
  • transform: optimize reflect.Type Implements() method
  • transform: fix bug in interface lowering when signatures are renamed
  • transform: don't rely on struct name of runtime.typecodeID
  • transform: use IPSCCP pass instead of the constant propagation pass
  • transform: fix func lowering assertion failure
  • transform: do not lower zero-sized alloc to alloca
  • transform: split interface and reflect lowering
• standard library
  • runtime: add dummy debug package
  • machine: fix data shift/mask in newUSBSetup
  • machine: make machine.I2C0 and similar objects pointers
  • machine: unify usbcdc code
  • machine: refactor PWM support
  • machine: avoid heap allocations in USB code
  • reflect: let reflect.Type be of interface type
  • reflect: implement a number of stub functions
  • reflect: check for access in the Interface method call
  • reflect: fix AssignableTo and Implements methods
  • reflect: implement Value.CanAddr
  • reflect: implement Sizeof and Alignof for func values
  • reflect: implement New function
  • runtime: implement command line arguments in hosted environments
  • runtime: implement environment variables for Linux
  • runtime: improve timers on nrf, and samd chips
• targets
  • all: use -Qunused-arguments only for assembly files
  • atmega1280: add PWM support
  • attiny: remove dummy UART
  • atsamd21: improve SPI
  • atsamd51: fix PWM support in atsamd51p20
  • atsamd5x: improve SPI
  • atsamd51, atsame5x: unify samd51 and same5x
  • atsamd51, atsamd21: fix ADC.Get() value at 8bit and 10bit
  • atsame5x: add support for CAN
  • avr: remove I2C stubs from attiny support
  • cortexm: check for arm-none-eabi-gdb and gdb-multiarch commands
  • cortexm: add __isr_vector symbol
  • cortexm: disable FPU on Cortex-M4
  • cortexm: clean up Cortex-M target files
  • fe310: fix SPI read
  • gameboy-advance: Fix RGBA color interpretation
  • nrf52833: add PWM support
  • stm32l0: use unified UART logic
  • stm32: move f103 (bluepill) to common i2c code
  • stm32: separate altfunc selection for UART Tx/Rx
  • stm32: i2c implementation for F7, L5 and L4 MCUs
  • stm32: make SPI CLK fast to fix data issue
  • stm32: support SPI on L4 series
  • unix: avoid possible heap allocation with -opt=0
  • unix: use conservative GC by default
  • unix: use the tasks scheduler instead of coroutines
  • wasi: upgrade WASI version to wasi_snapshot_preview1
  • wasi: darwin: support basic file io based on libc
  • wasm: only export explicitly exported functions
  • wasm: use WASI ABI for exit function
  • wasm: scan globals conservatively
• boards
  • arduino-mega1280: add support for the Arduino Mega 1280
  • arduino-nano-new: Add Arduino Nano w/ New Bootloader target
  • atsame54-xpro: add initial support this board
  • feather-m4-can: add initial support for this board
  • grandcentral-m4: add board support for Adafruit Grand Central M4 (SAMD51)
  • lgt92: update to new UART structure
  • microbit: remove LED constant
  • microbit-v2: add support for S113 SoftDevice
  • nucleol432: add support for this board
  • nucleo-l031k6: add this board
  • pca10059: initial support for this board
  • qtpy: fix msd-volume-name
  • qtpy: fix i2c setting
  • teensy40: move txBuffer allocation to UART declaration
  • teensy40: add UART0 as alias for UART1

0.17.0

---

• command line
  • switch to LLVM 11 for static builds
  • support gdb debugging with AVR
  • add support for additional openocd commands
  • add -x flag to print commands
  • use LLVM 11 by default when linking LLVM dynamically
  • update go-llvm to use LLVM 11 on macOS
  • bump go.bug.st/serial to version 1.1.2
  • do not build LLVM with libxml to work around a bugo on macOS
  • add support for Go 1.16
  • support gdb daemonization on Windows
  • remove support for LLVM 9, to fix CI
  • kill OpenOCD if it does not exit with a regular quit signal
  • support -ocd-output on Windows
• compiler
  • builder: parallelize most of the build
  • builder: remove unused cacheKey parameter
  • builder: add -mcpu flag while building libraries
  • builder: wait for running jobs to finish
  • cgo: add support for variadic functions
  • compiler: fix undefined behavior in wordpack
  • compiler: fix incorrect "exported function" panic
  • compiler: fix non-int integer constants (fixing a crash)
  • compiler: refactor and add tests
  • compiler: emit a nil check when slicing an array pointer
  • compiler: saturate float-to-int conversions
  • compiler: test float to int conversions and fix upper-bound calculation
  • compiler: support all kinds of deferred builtins
  • compiler: remove ir package
  • compiler: remove unnecessary main.main call workaround
  • compiler: move the setting of attributes to getFunction
  • compiler: create runtime types lazily when needed
  • compiler: move settings to a separate Config struct
  • compiler: work around an ARM backend bug in LLVM
  • interp: rewrite entire package
  • interp: fix alignment of untyped globals
  • loader: use name "main" for the main package
  • loader: support imports from vendor directories
  • stacksize: add support for DW_CFA_offset_extended
  • transform: show better error message in coroutines lowering
• standard library
  • machine: accept configuration struct for ADC parameters
  • machine: make I2C.Configure signature consistent
  • reflect: implement PtrTo
  • runtime: refactor to simplify stack switching
  • runtime: put metadata at the top end of the heap
• targets
  • atsam: add a length check to findPinPadMapping
  • atsam: improve USBCDC
  • atsam: avoid infinite loop when USBCDC is disconnected
  • avr: add SPI support for Atmega based chips
  • avr: use Clang for compiling C and assembly files
  • esp32: implement task based scheduler
  • esp32: enable the FPU
  • esp8266: implement task based scheduler
  • esp: add compiler-rt library
  • esp: add picolibc
  • nrf: refactor code a bit to reduce duplication
  • nrf: use SPIM peripheral instead of the legacy SPI peripheral
  • nrf: update nrfx submodule to latest commit
  • nrf52840: ensure that USB CDC interface is only initialized once
  • nrf52840: improve USBCDC
  • stm32: use stm32-rs SVDs which are of much higher quality
  • stm32: harmonization of UART logic
  • stm32: replace I2C addressable interface with simpler type
  • stm32: fix i2c and add stm32f407 i2c
  • stm32: revert change that adds support for channels in interrupts
  • wasm: implement a growable heap
  • wasm: fix typo in wasm_exec.js, syscall/js.valueLoadString()
  • wasm: Namespaced Wasm Imports so they don't conflict across modules, or reserved LLVM IR
  • wasi: support env variables based on libc
  • wasi: specify wasi-libc in a different way, to improve error message
• boards
  • matrixportal-m4: add support for board Adafruit Matrix Portal M4
  • mkr1000: add this board
  • nucleo-f722ze: add this board
  • clue: correct volume name and add alias for release version of Adafruit Clue board
  • p1am-100: add support for the P1AM-100 (similar to Arduino MKR)
  • microbit-v2: add initial support based on work done by @alankrantas thank you!
  • lgt92: support for STM32L0 MCUs and Dragino LGT92 device
  • nicenano: nice!nano board support
  • circuitplay-bluefruit: correct internal I2C pin mapping
  • clue: correct for lack of low frequency crystal
  • digispark: split off attiny85 target
  • nucleo-l552ze: implementation with CLOCK, LED, and UART
  • nrf52840-mdk-usb-dongle: add this board

• command-line
  • add initial support for LLVM 11
  • make lib64 clang include path check more robust
  • build: improve support for GOARCH=386 and add tests
  • gdb: add support for qemu-user targets
  • test: support non-host tests
  • test: add support for -c and -o flags
  • test: implement some benchmark stubs
• compiler
  • builder: improve detection of clang on Fedora
  • compiler: fix floating point comparison bugs
  • compiler: implement negate for complex numbers
  • loader: fix linkname in test binaries
  • transform: add missing return pointer restore for regular coroutine tail calls
• standard library
  • machine: switch default frequency to 4MHz
  • machine: clarify caller's responsibility in SetInterrupt
  • os: add LookupEnv() stub
  • reflect: implement Swapper
  • runtime: fix UTF-8 decoding
  • runtime: gc: use raw stack access whenever possible
  • runtime: use dedicated printfloat32
  • runtime: allow ranging over a nil map
  • runtime: avoid device/nxp dependency in HardFault handler
  • testing: implement dummy Helper method
  • testing: add Run method
• targets
  • arm64: add support for SVCall intrinsic
  • atsamd51: avoid panic when configuring SPI with SDI=NoPin
  • avr: properly support the .rodata section
  • esp8266: implement Pin.Get function
  • nintendoswitch: fix crash when printing long lines (> 120)
  • nintendoswitch: add env parser and removed unused stuff
  • nrf: add I2C error checking
  • nrf: give more flexibility in picking SPI speeds
  • nrf: fix nrf52832 flash size
  • stm32f103: support wakeups from interrupts
  • stm32f405: add SPI support
  • stm32f405: add I2C support
  • wasi: add support for this target
  • wasi: use 'generic' ABI by default
  • wasi: remove --no-threads flag from wasm-ld
  • wasm: add instanceof support for WebAssembly
  • wasm: use fixed length buffer for putchar
• boards
  • d1mini: add this ESP8266 based board
  • esp32: use board definitions instead of chip names
  • qtpy: add board definition for Adafruit QTPy
  • teensy40: add this board

• command-line
  • add cached GOROOT to info subcommand
  • embed git-hash in tinygo-dev executable
  • implement tinygo targets to list usable targets
  • use simpler file copy instead of file renaming to avoid issues on nrf52840 UF2 bootloaders
  • use ToSlash() to specify program path
  • support flashing esp32/esp8266 directly from tinygo
  • when flashing call PortReset only on other than openocd
• compiler
  • compileopts: add support for custom binary formats
  • compiler: improve display of goroutine wrappers
  • interp: don't panic in the Store method
  • interp: replace some panics with error messages
  • interp: show error line in first line of the traceback
  • loader: be more robust when creating the cached GOROOT
  • loader: rewrite/refactor much of the code to use go list directly
  • loader: use ioutil.TempDir to create a temporary directory
  • stacksize: deal with DW_CFA_advance_loc1
• standard library
  • runtime: use waitForEvents when appropriate
• wasm
  • wasm: Remove --no-threads from wasm-ld calls.
  • wasm: update wasi-libc dependency
• targets
  • arduino-mega2560: fix flashing on Windows
  • arm: automatically determine stack sizes
  • arm64: make dynamic loader structs and constants private
  • avr: configure emulator in board files
  • cortexm: fix stack size calculation with interrupts
  • flash: add openocd settings to atsamd21 / atsamd51
  • flash: add openocd settings to nrf5
  • microbit: reelboard: flash using OpenOCD when needed
  • nintendoswitch: Add dynamic loader for runtime loading PIE sections
  • nintendoswitch: fix import cycle on dynamic_arm64.go
  • nintendoswitch: Fix invalid memory read / write in print calls
  • nintendoswitch: simplified assembly code
  • nintendoswitch: support outputting .nro files directly
• boards
  • arduino-zero: Adding support for the Arduino Zero (#1365)
  • atsamd2x: fix BAUD value
  • atsamd5x: fix BAUD value
  • bluepill: Enable stm32's USART2 for the board and map it to UART1 tinygo's device
  • device/atsamd51x: add all remaining bitfield values for PCHCTRLm Mapping
  • esp32: add libgcc ROM functions to linker script
  • esp32: add SPI support
  • esp32: add support for basic GPIO
  • esp32: add support for the Espressif ESP32 chip
  • esp32: configure the I/O matrix for GPIO pins
  • esp32: export machine.PortMask* for bitbanging implementations
  • esp8266: add support for this chip
  • machine/atsamd51x,runtime/atsamd51x: fixes needed for full support for all PWM pins. Also adds some useful constants to clarify peripheral clock usage
  • machine/itsybitsy-nrf52840: add support for Adafruit Itsybitsy nrf52840 (#1243)
  • machine/stm32f4: refactor common code and add new build tag stm32f4 (#1332)
  • nrf: add SoftDevice support for the Circuit Playground Bluefruit
  • nrf: call sd_app_evt_wait when the SoftDevice is enabled
  • nrf52840: add build tags for SoftDevice support
  • nrf52840: use higher priority for USB-CDC code
  • runtime/atsamd51x: use PCHCTRL_GCLK_SERCOMX_SLOW for setting clocks on all SERCOM ports
  • stm32f405: add basic UART handler
  • stm32f405: add STM32F405 machine/runtime, and new board/target feather-stm32f405
• build
  • all: run test binaries in the correct directory
  • build: Fix arch release job
  • ci: run tinygo test for known-working packages
  • ci: set git-fetch-depth to 1
  • docker: fix the problem with the wasm build (#1357)
  • Makefile: check whether submodules have been downloaded in some common cases
• docs
  • add ESP32, ESP8266, and Adafruit Feather STM32F405 to list of supported boards

• command-line
  • support for Go 1.15
• compiler
  • loader: work around Windows symlink limitation

• command-line
  • fix getDefaultPort() on non-English Windows locales
  • compileopts: improve error reporting of unsupported flags
  • fix test subcommand
  • use auto-retry to locate MSD for UF2 and HEX flashing
  • fix touchSerialPortAt1200bps on Windows
  • support package names with backslashes on Windows
• compiler
  • fix a few crashes due to named types
  • add support for atomic operations
  • move the channel blocked list onto the stack
  • fix -gc=none
  • fix named string to []byte slice conversion
  • implement func value and builtin defers
  • add proper parameter names to runtime.initAll, to fix a panic
  • builder: fix picolibc include path
  • builder: use newer version of gohex
  • builder: try to determine stack size information at compile time
  • builder: remove -opt=0
  • interp: fix sync/atomic.Value load/store methods
  • loader: add Go module support
  • transform: fix debug information in func lowering pass
  • transform: do not special-case zero or one implementations of a method call
  • transform: introduce check for method calls on nil interfaces
  • transform: gc: track 0-index GEPs to fix miscompilation
• cgo
  • Add LDFlags support
• standard library
  • extend stdlib to allow import of more packages
  • replace master/slave terminology with appropriate alternatives (MOSI->SDO etc)
  • internal/bytealg: reimplement bytealg in pure Go
  • internal/task: fix nil panic in (*internal/task.Stack).Pop
  • os: add Args and stub it with mock data
  • os: implement virtual filesystem support
  • reflect: add Cap and Len support for map and chan
  • runtime: fix return address in scheduler on RISC-V
  • runtime: avoid recursion in printuint64 function
  • runtime: replace ReadRegister with AsmFull inline assembly
  • runtime: fix compilation errors when using gc.extalloc
  • runtime: add cap and len support for chans
  • runtime: refactor time handling (improving accuracy)
  • runtime: make channels work in interrupts
  • runtime/interrupt: add cross-chip disable/restore interrupt support
  • sync: implement sync.Cond
  • sync: add WaitGroup
• targets
  • arm: allow nesting in DisableInterrupts and EnableInterrupts
  • arm: make FPU configuration consistent
  • arm: do not mask fault handlers in critical sections
  • atmega2560: fix pin mapping for pins D2, D5 and the L port
  • atsamd: return an error when an incorrect PWM pin is used
  • atsamd: add support for pin change interrupts
  • atsamd: add DAC support
  • atsamd21: add more ADC pins
  • atsamd51: fix ROM / RAM size on atsamd51j20
  • atsamd51: add more pins
  • atsamd51: add more ADC pins
  • atsamd51: add pin change interrupt settings
  • atsamd51: extend pinPadMapping
  • arduino-nano33: use (U)SB flag to ensure that device can be found when not on default port
  • arduino-nano33: remove (d)ebug flag to reduce console noise when flashing
  • avr: use standard pin numbering
  • avr: unify GPIO pin/port code
  • avr: add support for PinInputPullup
  • avr: work around codegen bug in LLVM 10
  • avr: fix target triple
  • fe310: remove extra println left in by mistake
  • feather-nrf52840: add support for the Feather nRF52840
  • maixbit: add board definition and dummy runtime
  • nintendoswitch: Add experimental Nintendo Switch support without CRT
  • nrf: expose the RAM base address
  • nrf: add support for pin change interrupts
  • nrf: add microbit-s110v8 target
  • nrf: fix bug in SPI.Tx
  • nrf: support debugging the PCA10056
  • pygamer: add Adafruit PyGamer support
  • riscv: fix interrupt configuration bug
  • riscv: disable linker relaxations during gp init
  • stm32f4disco: add new target with ST-Link v2.1 debugger
  • teensy36: add Teensy 3.6 support
  • wasm: fix event handling
  • wasm: add --no-demangle linker option
  • wioterminal: add support for the Seeed Wio Terminal
  • xiao: add support for the Seeed XIAO

• standard library
  • runtime: do not put scheduler and GC code in the same section
  • runtime: copy stack scan assembly for GBA
• boards
  • gameboy-advance: always use ARM mode instead of Thumb mode

• command line
  • use gdb-multiarch for debugging Cortex-M chips
  • support tinygo run with simavr
  • support LLVM 10
  • support Go 1.14
  • retry 3 times when attempting to do a 1200-baud reset
• compiler
  • mark the abort function as noreturn
  • fix deferred calls to exported functions
  • add debug info for local variables
  • check for channel size limit
  • refactor coroutine lowering
  • add dereferenceable_or_null attribute to pointer parameters
  • do not perform nil checking when indexing slices and on unsafe.Pointer
  • remove runtime.isnil hack
  • use LLVM builtins for runtime memcpy/memmove/memzero functions
  • implement spec-compliant shifts on negative/overflow
  • support anonymous type asserts
  • track pointer result of string concatenation for GC
  • track PHI nodes for GC
  • add debug info to goroutine start wrappers
  • optimize comparing interface values against nil
  • fix miscompilation when deferring an interface call
  • builder: include picolibc for most baremetal targets
  • builder: run tools (clang, lld) as separate processes
  • builder: use -fshort-enums consistently
  • interp: add support for constant type asserts
  • interp: better support for interface operations
  • interp: include backtrace with error
  • transform: do not track const globals for GC
  • transform: replace panics with source locations
  • transform: fix error in interface lowering pass
  • transform: make coroutine lowering deterministic
  • transform: fix miscompilation in func lowering
• cgo
  • make -I and -L paths absolute
• standard library
  • machine: set the USB VID and PID to the manufacturer values
  • machine: correct USB CDC composite descriptors
  • machine: move errors.New calls to globals
  • runtime: support operations on nil maps
  • runtime: fix copy builtin return value on AVR
  • runtime: refactor goroutines
  • runtime: support -scheduler=none on most platforms
  • runtime: run package initialization in the main goroutine
  • runtime: export malloc / free for use from C
  • runtime: add garbage collector that uses an external allocator
  • runtime: scan callee-saved registers while marking the stack
  • runtime: remove recursion from conservative GC
  • runtime: fix blocking select on nil channel
  • runtime/volatile: include ReplaceBits method
  • sync: implement trivial sync.Map
• targets
  • arm: use -fomit-frame-pointer
  • atmega1284: support this chip for testing purposes
  • atsamd51: make QSPI available on all boards
  • atsamd51: add support for ADC1
  • atsamd51: use new interrupt registration in UART code
  • attiny: clean up pin definitions
  • avr: use the correct RAM start address
  • avr: pass the correct -mmcu flag to the linker
  • avr: add support for tasks scheduler (disabled by default)
  • avr: fix linker problem with overlapping program/data areas
  • nrf: fix typo in pin configuration options
  • nrf: add lib/nrfx/mdk to include dirs
  • nrf52840: implement USB-CDC
  • riscv: implement VirtIO target and add RISC-V integration test
  • riscv: add I2C support for the HiFive1 rev B board
  • stm32: refactor GPIO pin handling
  • stm32: refactor UART code
  • stm32f4: add SPI
  • wasm: support Go 1.14 (breaking previous versions)
  • wasm: support syscall/js.CopyBytesToJS
  • wasm: sync polyfills from Go 1.14.
• boards
  • arduino-mega2560: add the Arduino Mega 2560
  • clue-alpha: add the Adafruit CLUE Alpha
  • gameboy-advance: enable debugging with GDB
  • particle-argon: add the Particle Argon board
  • particle-boron: add the Particle Boron board
  • particle-xenon: add the Particle Xenon board
  • reelboard: add reelboard-s140v7 SoftDevice target

• command line
  • add initial FreeBSD support
  • remove getting a serial port in gdb subcommand
  • add support for debugging through JLinkGDBServer
  • fix CGo when cross compiling
  • remove default port check for Digispark as micronucleus communicates directly using HID
  • differentiate between various serial/USB error messages
• builder
  • improve detection of Clang headers
• compiler
  • fix assertion on empty interface
  • don't crash when encountering types.Invalid
  • revise defer to use heap allocations when running a variable number of times
  • improve error messages for failed imports
  • improve "function redeclared" error
  • add globaldce pass to start of optimization pipeline
  • add support for debugging globals
  • implement RISC-V CSR operations as intrinsics
  • add support for CGO_ENABLED environment variable
  • do not emit debug info for extern globals (bugfix)
  • add support for interrupts
  • implement maps for arbitrary keys
  • interp: error location for "unknown GEP" error
  • wasm-abi: create temporary allocas in the entry block
• cgo
  • add support for symbols in #define
  • fix a bug in number tokenization
• standard library
  • machine: avoid bytes package in USB logic
  • runtime: fix external address declarations
  • runtime: provide implementation for internal/bytealg.IndexByte
• targets
  • atsamd51: fix volatile usage
  • atsamd51: fix ADC, updating to 12-bits precision
  • atsamd51: refactor SPI pin configuration to only look at pin numbers
  • atsamd51: switch UART to use new pin configuration
  • atsamd51: fix obvious bug in I2C code
  • atsamd51: use only the necessary UART interrupts
  • atsamd51: refactor I2C pin handling to auto-detect pin mode
  • avr: use a garbage collector
  • fe310: use CLINT peripheral for timekeeping
  • fe310: add support for PLIC interrupts
  • fe310: implement UART receive interrupts
  • riscv: support sleeping in QEMU
  • riscv: add bare-bones interrupt support
  • riscv: print exception PC and code
  • wasm: implement memcpy and memset
  • wasm: include wasi-libc
  • wasm: use wasi ABI for basic startup/stdout
• boards
  • arduino: make avrdude command line compatible with Windows
  • arduino-nano: add this board
  • arduino-nano33: fix UART1 and UART2
  • circuitplay-bluefruit: add this board
  • digispark: add clock speed and pin mappings
  • gameboy-advance: include compiler-rt in build
  • gameboy-advance: implement interrupt handler
  • hifive1b: add support for gdb subcommand
  • pyportal: add this board
  • pyportal: remove manual SPI pin mapping as now handled by default

• command line
  • add support for QEMU in gdb subcommand
  • use builtin Clang when building statically, dropping the clang-9 dependency
  • search for default serial port on both macOS and Linux
  • windows: support tinygo flash directly by using win32 wmi
• compiler
  • add location information to the IR checker
  • make reflection sidetables constant globals
  • improve error locations in goroutine lowering
  • interp: improve support for maps with string keys
  • interp: add runtime fallback for mapassign operations
• standard library
  • machine: add support for SPI.Tx() on play.tinygo.org
  • machine: rename CPU_FREQUENCY to CPUFrequency()
• targets
  • adafruit-pybadge: add Adafruit Pybadge
  • arduino-nano33: allow simulation on play.tinygo.org
  • arduino-nano33: fix default SPI pin numbers to be D13/D11/D12
  • circuitplay-express: allow simulation on play.tinygo.org
  • hifive1-qemu: add target for testing RISC-V bare metal in QEMU
  • riscv: fix heap corruption due to changes in LLVM 9
  • riscv: add support for compiler-rt
  • qemu: rename to cortex-m-qemu

• command line
  • halt GDB after flashing with gdb subcommand
  • fix a crash when using -ocd-output
  • add info subcommand
  • add -programmer flag
• builder
  • macos: use llvm@8 instead of just llvm in paths
  • add linkerscript key to target JSON files
  • write a symbol table when writing out the compiler-rt lib
  • make Clang header detection more robust
  • switch to LLVM 9
• compiler
  • fix interface miscompilation with reflect
  • fix miscompile of static goroutine calls to closures
  • fix todo: store panic
  • fix incorrect starting value for optimized allocations in a loop
  • optimize coroutines on non-Cortex-M targets
  • fix crash for programs which have heap allocations but never hit the GC
  • add support for async interface calls
  • fix inserting non-const values in a const global
  • interp: improve error reporting
  • interp: implement comparing ptrtoint to 0
• cgo
  • improve diagnostics
  • implement the constant parser (for #define) as a real parser
  • rename reserved field names such as type
  • avoid "unsafe" imported but not used error
  • include all enums in the CGo Go AST
  • add support for nested structs and unions
  • implement #cgo CFLAGS
• standard library
  • reflect: add implementation of array alignment
  • runtime: improve scheduler performance when no goroutines are queued
  • runtime: add blocking select
  • runtime: implement interface equality in non-trivial cases
  • runtime: add AdjustTimeOffset to update current time
  • runtime: only implement CountString for required platforms
  • runtime: use MSP/PSP registers for scheduling on Cortex-M
• targets
  • arm: add system timer registers
  • atmega: add port C GPIO support
  • atsamd21: correct handling of pins >= 32
  • atsamd21: i2s initialization fixes
  • atsamd51: fix clock init code
  • atsamd51: correct initialization for RTC
  • atsamd51: fix pin function selection
  • atsamd51: pin method cleanup
  • atsamd51: allow setting pin mode for each of the SPI pins
  • atsamd51: correct channel init and pin map for ADC based on ItsyBitsy-M4
  • feather-m4: add Adafruit Feather M4 board
  • hifive1b: add support for SPI1
  • hifive1b: fix compiling in simulation
  • linux: fix time on arm32
  • metro-m4: add support for Adafruit Metro M4 Express Airlift board
  • metro-m4: fixes for UART2
  • pinetime-devkit0: add support for the PineTime dev kit
  • x9pro: add support for this smartwatch
  • pca10040-s132v6: add support for SoftDevice
  • pca10056-s140v7: add support for SoftDevice
  • arduino-nano33: added SPI1 connected to NINA-W102 chip on Arduino Nano 33 IOT

• command line
  • implement 1200-baud UART bootloader reset when flashing boards that support it
  • flash using mass-storage device for boards that support it
  • implement tinygo env
  • add support for Windows (but not yet producing Windows binaries)
  • add Go version to tinygo env
  • update SVD files for up-to-date peripheral interfaces
• compiler
  • add //go:align pragma
  • fix bug related to type aliases
  • add support for buffered channels
  • remove incorrect reflect optimization
  • implement copying slices in init interpretation
  • add support for constant indices with a named type
  • add support for recursive types like linked lists
  • fix miscompile of function nil panics
  • fix bug related to goroutines
• standard library
  • machine: do not check for nil slices in SPI.Tx
  • reflectlite: add support for Go 1.13
  • runtime: implement internal/bytealg.CountString
  • sync: properly handle nil New func in sync.Pool
• targets
  • arduino: fix .bss section initialization
  • fe310: implement Pin.Get
  • gameboy-advance: support directly outputting .gba files
  • samd: reduce code size by avoiding reflection
  • samd21: do not hardcode pin numbers for peripherals
  • stm32f103: avoid issue with time.Sleep less than 200µs

• command line
  • fix parsing of beta Go versions
  • check the major/minor installed version of Go before compiling
  • validate -target flag better to not panic on an invalid target
• compiler
  • implement full slice expression: s[:2:4]
  • fix a crash when storing a linked list in an interface
  • fix comparing struct types by making type IDs more unique
  • fix some bugs in IR generation
  • add support for linked lists in reflect data
  • implement []rune to string conversion
  • implement support for go on func values
• standard library
  • reflect: add support for named types
  • reflect: add support for t.Bits()
  • reflect: add basic support for t.AssignableTo()
  • reflect: implement t.Align()
  • reflect: add support for struct types
  • reflect: fix bug in v.IsNil and v.Pointer for addressable values
  • reflect: implement support for array types
  • reflect: implement t.Comparable()
  • runtime: implement stack-based scheduler
  • runtime: fix bug in the sleep queue of the scheduler
  • runtime: implement memcpy for Cortex-M
  • testing: implement stub testing.B struct
  • testing: add common test logging methods such as Errorf/Fatalf/Printf
• targets
  • 386: add support for linux/386 syscalls
  • atsamd21: make SPI pins configurable so that multiple SPI ports can be used
  • atsamd21: correct issue with invalid first reading coming from ADC
  • atsamd21: add support for reset-to-bootloader using 1200baud over USB-CDC
  • atsamd21: make pin selection more flexible for peripherals
  • atsamd21: fix minimum delay in time.Sleep
  • atsamd51: fix minimum delay in time.Sleep
  • nrf: improve SPI write-only speed, by making use of double buffering
  • stm32f103: fix SPI frequency selection
  • stm32f103: add machine.Pin.Get method for reading GPIO values
  • stm32f103: allow board specific UART usage
  • nucleo-f103rb: add support for NUCLEO-F103RB board
  • itsybitsy-m4: add support for this board with a SAMD51 family chip
  • cortex-m: add support for arm.SystemReset()
  • gameboy-advance: add initial support for the GameBoy Advance
  • wasm: add //go:wasm-module magic comment to set the wasm module name
  • wasm: add syscall/js.valueSetIndex support
  • wasm: add syscall/js.valueInvoke support

• targets
  • atsamd21: add support for the -port flag in the flash subcommand

• command line
  • try more locations to find Clang built-in headers
  • add support for tinygo test
  • build current directory if no package is specified
  • support custom .json target spec with -target flag
  • use zversion.go to detect version of GOROOT version
  • make initial heap size configurable for some targets (currently WebAssembly only)
• cgo
  • add support for bitfields using generated getters and setters
  • add support for anonymous structs
• compiler
  • show an error instead of panicking on duplicate function definitions
  • allow packages like github.com/tinygo-org/tinygo/src/* by aliasing it
  • remove //go:volatile support
    It has been replaced with the runtime/volatile package.
  • allow pointers in map keys
  • support non-constant syscall numbers
  • implement non-blocking selects
  • add support for the -tags flag
  • add support for string to []rune conversion
  • implement a portable conservative garbage collector (with support for wasm)
  • add the //go:noinline pragma
• standard library
  • os: add os.Exit and syscall.Exit
  • os: add several stubs
  • runtime: fix heap corruption in conservative GC
  • runtime: add support for math intrinsics where supported, massively speeding up some benchmarks
  • testing: add basic support for testing
• targets
  • add support for a generic target that calls __tinygo_* functions for peripheral access
  • arduino-nano33: add support for this board
  • hifive1: add support for this RISC-V board
  • reelboard: add e-paper pins
  • reelboard: add PowerSupplyActive to enable voltage for on-board devices
  • wasm: put the stack at the start of linear memory, to detect stack overflows

• command line
  • some portability improvements
  • make $GOROOT more robust and configurable
  • check for Clang at the Homebrew install location as fallback
• compiler driver
  • support multiple variations of LLVM commands, for non-Debian distributions
• compiler
  • improve code quality in multiple ways
  • make panic configurable, adding trap on panic
  • refactor many internal parts of the compiler
  • print all errors encountered during compilation
  • implement calling function values of a named type
  • implement returning values from blocking functions
  • allow larger-than-int values to be sent across a channel
  • implement complex arithmetic
  • improve hashmap support
  • add debuginfo for function arguments
  • insert nil checks on stores (increasing code size)
  • implement volatile operations as compiler builtins
  • add //go:inline pragma
  • add build tags for the Go stdlib version
• cgo
  • implement char, enum and void* types
  • support #include for builtin headers
  • improve typedef/struct/enum support
  • only include symbols that are necessary, for broader support
  • mark external function args as nocapture
  • implement support for some #define constants
  • implement support for multiple CGo files in a single package

• standard library
  • machine: remove microbit matrix (moved to drivers repository)
  • machine: refactor pins to use Pin type instead of GPIO
  • runtime: print more interface types on panic, including error

• targets
  • arm: print an error on HardFault (including stack overflows)
  • atsamd21: fix a bug in the ADC peripheral
  • atsamd21: add support for I2S
  • feather-m0: add support for this board
  • nrf51: fix a bug in I2C
  • stm32f103xx: fix a bug in I2C
  • syscall: implement Exit on unix
  • trinket-m0: add support for this board
  • wasm: make main example smaller
  • wasm: don't cache wasm file in the server, for ease of debugging
  • wasm: work around bug #41508 that caused a deadlock while linking
  • wasm: add support for js.FuncOf

• compiler driver
  • use wasm-ld instead of wasm-ld-8 on macOS
  • drop dependency on llvm-ar
  • fix linker script includes when running outside TINYGOROOT
• compiler
  • switch to LLVM 8
  • add support for the Go 1.12 standard library (Go 1.11 is still supported)
  • work around lack of escape analysis due to nil checks
  • implement casting named structs and pointers to them
  • fix int casting to use the source signedness
  • fix some bugs around make([]T, …) with uncommon index types
  • some other optimizations
  • support interface asserts in interp for "math/rand" support
  • resolve all func value targets at compile time (wasm-only at the moment)
• cgo
  • improve diagnostics
  • implement C struct, union, and arrays
  • fix CGo-related crash in libclang
  • implement C.struct_ types
• targets
  • all baremetal: pretend to be linux/arm instead of js/wasm
  • avr: improve uintptr support
  • cortexm: implement memmove intrinsic generated by LLVM
  • cortexm: use the lld linker instead of arm-none-eabi-ld
  • darwin: use custom syscall package that links to libSystem.dylib
  • microbit: add blink example
  • samd21: support I2C1
  • samd21: machine/atsamd21: correct pad/pin handling when using both UART and USBCDC interfaces at same time
  • stm32f4discovery: add support for this board
  • wasm: support async func values
  • wasm: improve documentation and add extra example

• compiler
  • fix objcopy replacement to include the .data section in the firmware image
  • use llvm-ar-7 on Linux to fix the Docker image

• compiler
  • switch to the hardfloat ABI on ARM, which is more widely used
  • avoid a dependency on objcopy (arm-none-eabi-objcopy etc.)
  • fix a bug in make([]T, n) where n is 64-bits on a 32-bit platform
  • adapt to a change in the AVR backend in LLVM 8
  • directly support the .uf2 firmware format as used on Adafruit boards
  • fix a bug when calling panic() at init time outside of the main package
  • implement nil checks, which results in a ~5% increase in code size
  • inline slice bounds checking, which results in a ~1% decrease in code size
• targets
  • samd21: fix a bug in port B pins
  • samd21: implement SPI peripheral
  • samd21: implement ADC peripheral
  • stm32: fix a bug in timekeeping
  • wasm: fix a bug in wasm_exec.js that caused corruption in linear memory when running on Node.js.

• compiler
  • remove old -initinterp flag
  • add support for macOS
• cgo
  • add support for bool/float/complex types
• standard library
  • device/arm: add support to disable/enable hardware interrupts
  • machine: add CPU frequency for nrf-based boards
  • syscall: add support for darwin/amd64
• targets
  • circuitplay_express: add support for this board
  • microbit: add regular pin constants
  • samd21: fix time function for goroutine support
  • samd21: add support for USB-CDC (serial over USB)
  • samd21: add support for pins in port B
  • samd21: add support for pullup and pulldown pins
  • wasm: add support for Safari in example

• command line
  • add version subcommand
• compiler
  • fix a bug in floating point comparisons with NaN values
  • fix a bug when calling panic in package initialization code
  • add support for comparing complex64 and complex128
• cgo
  • add support for external globals
  • add support for pointers and function pointers
• standard library
  • fmt: initial support, fmt.Println works
  • math: support for most/all functions
  • os: initial support (only stdin/stdout/stderr)
  • reflect: initial support
  • syscall: add support for amd64, arm, and arm64