Most programmers support the "reset halt" command, which resets the
target but keeps it halted at the first instruction. This is a much more
natural way of working with GDB, and allows setting breakpoints before
the program is started.
This commit switches to `reset halt` by default and also stops running
the program directly when debugging natively on the host.
This makes it possible to query these environment variables from
anywhere, which might be useful. More importantly, it puts them in a
central location from where they can be queried, useful for a `go env`
subcommand.
Instead of specifying explicit commands, most of these commands have
been replaced by more specific properties.
This is work that will be necessary for an eventual -programmer flag to
the compiler, with which it is possible to select which programmer to
use to flash or debug a chip. That's not very useful for boards that
already include a programmer or bootloader for that purpose, but is very
useful for novel boards or single-purpose boards that are not already
included in TinyGo.
The above changes might indeed introduce inconsistencies in the IR, but
the code is small and doesn't change often so it's unnecessary to always
check for errors. It will be tested again later anyway.
The compile time impact was somewhere around 6%, so that's a nice
improvement.
This scheduler is intended to live along the (stackless) coroutine based
scheduler which is needed for WebAssembly and unsupported platforms. The
stack based scheduler is somewhat simpler in implementation as it does
not require full program transform passes and supports things like
function pointers and interface methods out of the box with no changes.
Code size is reduced in most cases, even in the case where no scheduler
scheduler is used at all. I'm not exactly sure why but these changes
likely allowed some further optimizations somewhere. Even RAM is
slightly reduced, perhaps some global was elminated in the process as
well.
When the target supports it, allow the (initial) heap size to be
configured. Currently only supported in WebAssembly.
This also changes the default heap size of WebAssembly from 64kB to 1MB.
dumb -> leaking:
make it more clear what this "GC" does: leak everything.
marksweep -> conservative:
"marksweep" is too generic, use "conservative" to differentiate
between future garbage collectors: precise marksweep / mark-compact /
refcounting.
Without this, clang tries to process the header line as part of
its valid input. eg:
main.ll:1:1: error: expected top-level entity
Generated LLVM IR:
^
Check various locations that $GOROOT may live, including the location of
the go binary. But make it possible to override this autodetection by
setting GOROOT manually as an environment variable.
On Debian, all LLVM commands have a version suffix (clang-8, ld.lld-8,
wasm-ld-8, etc.). However. Most other distributions only provide a
version prefix for Clang and not for all the other commands.
This commit fixes the issue by trying the command with the version
suffix first and falling back to one without if needed.
This commit avoids setting the working directory to the TinyGo root when
invocating Clang. This helps to weed out issues before we add support
for bundling Clang in a release.
Most of these errors are actually "todo" or "unimplemented" errors, so
the return type is known. This means that compilation can proceed (with
errors) even though the output will be incorrect. This is useful because
this way, all errors in a compilation unit can be shown together to the
user.
This commit adds the TinyGo root directory (`TINYGOROOT`) to the linker
script `-L` search path, so that linker scripts can be found when
running `tinygo` outside of the TinyGo root.
This was already working before when using an external linker by setting
the working directory, but this is not possible when using the internal
linker. However, by adding the root directory to the linker search path
(`-L`), it can now find these linker scripts.
fixes#265
This commit does a few things:
* remove the -8 suffix on macOS, where it is not necessary
* add smoke tests for compiling wasm files on Linux and macOS
The interp package does a much better job at interpretation, and is
implemented as a pass on the IR which makes it much easier to compose.
Also, the implementation works much better as it is based on LLVM IR
instead of Go SSA.
When building statically against LLVM, LLD is also included now. When
included, the built in wasm-ld will automatically be used instead of the
external command.
There is also support for linking ELF files but because lld does not
fully support armv6m this is not yet enabled (it produces a warning).
Ayke van Laethem
Ron Evans
Jaden Weiss
Justin Clift
m-chichikalov
Carolyn Van Slyck
j7b