This adds an optimization to EmitPointerPack when all values are constants.
The values are stored in a constant global instead of on the heap.
This eliminates a heap allocation, and can reduce binary size.
This marks the libc function abort as non-returning. This allows LLVM to optimize away code after panics. Also, this allows deadlocks to be properly propogated with the coroutines scheduler.
This allows TinyGo-built binaries to run under wasmtime, for example:
tinygo build -o test.wasm -no-debug -target=wasm examples/test
wasmtime run test.wasm 0
This avoids problems with goroutines in WebAssembly, and is generally a
good thing. It fixes some cases of the following problem:
LLVM ERROR: Coroutines cannot handle non static allocas yet
Thanks to Kyle Lemons for the inspiration and original design. The
implementation in this commit is very different however, building on top
of the software vectoring needed in RISC-V. The result is a flexible
interrupt handler that does not take up any RAM for configuration.
This is the same problem as in
https://github.com/tinygo-org/tinygo/pull/605, but other targets also
suffer from it.
Discovered with the GBA target, but as pointed out in
https://bugs.llvm.org/show_bug.cgi?id=42881#c1 this appears to be a bug
in the way external globals are declared, not in LLVM. Therefore I
decided that fixing it everywhere would be the best thing to do.
This commit adds support for software vectoring in the PLIC interrupt.
The interrupt table is created by the compiler, which leads to very
compact code while retaining the flexibility that the interrupt API
provides.
This might sound crazy, but I think it's better to enable the GC by
default to avoid surprises. It costs 1130 bytes of flash and 16 bytes of
RAM (plus heap overhead) so it's not exactly free, but if needed it can
easily be disabled with `-gc=leaking`. On the Uno (32kB flash, 2kB RAM)
that's not massive, on the DigiSpark (8kB flash, 0.5kB RAM) that may be
too much depending on the application.
This implementation simply casts types without special support to an
interface, to make the implementation simpler and possibly reducing the
code size too. It will likely be slower than the canonical Go
implementation though (which builds special compare and hash functions
at compile time).
The wasi-libc Makefile uses the `find` command line tool. Unfortunately,
it was using the Windows find version instead of the MinGW version,
leading to lots of errors at a later stage.
This commit prepends /usr/bin to `$PATH` to make sure the MinGW version
is found first.
