This makes it easier to move the TinyGo compiler between Linux versions
because it doesn't depend on any system libraries anymore. For example,
binaries should be able to run on old Linux versions and on
distributions without glibc (such as Alpine Linux).
Without extra flags, we would try to use LLVM 13 for cgo and LLVM 14 for
other things since 873412b43a. That isn't
great. So fix this by only using LLVM 14 in the cgo package.
The MachO file format is a bit weird and doesn't store the DWARF debug
information directly in the file. Instead, it has to be looked up in the
original object file. This makes reading the DWARF debug information for
code size usage a bit more difficult. However, it works with this
change.
This has always been unsupported on MacOS and has in fact been removed
from upstream Go a few releases ago. So do the same for TinyGo.
Linux seems to be the only supported OS with a stable syscall interface.
This changes the compiler from treating calls to sync/atomic.* functions
as special calls (emitted directly at the call site) to actually
defining their declarations when there is no Go SSA implementation. And
rely on the inliner to inline these very small functions.
This works a bit better in practice. For example, this makes it possible
to use these functions in deferred function calls.
This commit is a bit large because it also needs to refactor a few
things to make it possible to define such intrinsic functions.
I don't understand why this wasn't caught in CI. It should have. In any
case, because the llvm-features string was updated, these IR outputs
were updated.
This commit will start to use a few more WebAssembly features, such as
bulk memory operations. This results in a significant code size saving.
How much it saves varies a lot but it's typically around 1300 bytes.
This change is possible by bumping our minimum Node.js version to 14.
The previous LTS version (12) has been marked end of life, so we can
start to depend on features in the current oldest LTS version, which is
version 14. Browsers have been supporting these features for a long time
now, it's just Node.js that prevented us doing this before.
Some source code wasn't part of `FMT_PATHS` so wasn't checked for
correct formatting. This change includes all this source code and
excludes cgo/testdata because it contains files that can't be parsed.
You can see that it works with the following command:
tinygo run -target=simavr ./testdata/recover.go
This also gets the following tests to pass again:
go test -run=Build -target=simavr -v
Adding support for AVR was a bit more compliated because it's also
necessary to save and restore the Y register.
This is a small change to make it easier to support architectures that
need to restore more than just the sp and pc registers. In particular,
it is needed for the AVR architecture that needs to restore the frame
pointer (Y register).
If an interrupt happens between the writes to SPL and SPH, the stack
pointer is inconsistent and terrible things will happen. Therefore,
disable interrupts while updating the stack pointer.
Interrupts are restored _before_ the write to SPH. This is safe, because
interrupts are re-enabled with a one cycle delay. The avr-gcc and Clang
compilers do the same thing when they need to update the stack pointer.
It's almost impossible to test for this bug, but it should make firmware
just a little bit more reliable.
