rustc.html example not working

[bjorn3]

No description provided.

[bjorn3]

@RealSput let's continue the discussion of rust-lang/miri#722 (comment) here.

What do you see in the terminal window on the page itself?

[RealSput]

I see this error:

Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'data')
    at (index):139:86

which is caused by:

        console.log(fds[5].dir.contents["hello.hello.7631c747841c2a99-cgu.0.rcgu.o"].data);

And when I log fds[5].dir.contents, I only see the hello.rs file. No other files.

[bjorn3]

That is in the dev tools console, right? What does the page itself show?

[RealSput]

Just xterm.js terminal. No links.

[bjorn3]

And does the terminal show anything?

[RealSput]

Just this:

[bjorn3]

It seems like rustc crashed early on or something. Can you also post a screenshot of the browser console?

[jozanza]

I'm getting a failure also, but with more info in the xterm console:

INFO rustc_interface::passes Post-codegen
Ty interner             total           ty lt ct all
    Adt               :    156 29.2%,  0.0%   1.9%  0.0%  0.0%
    Array             :     15  2.8%,  0.0%   1.9%  0.0%  0.0%
    Slice             :     11  2.1%,  0.0%   0.9%  0.0%  0.0%
    RawPtr            :     15  2.8%,  0.0%   0.0%  0.0%  0.0%
    Ref               :    121 22.6%,  1.9%   9.5%  0.0%  0.0%
    FnDef             :     30  5.6%,  0.0%   0.9%  0.0%  0.0%
    FnPtr             :      6  1.1%,  0.0%   0.0%  0.0%  0.0%
    Placeholder       :      0  0.0%,  0.0%   0.0%  0.0%  0.0%
    Generator         :      0  0.0%,  0.0%   0.0%  0.0%  0.0%
    GeneratorWitness  :      0  0.0%,  0.0%   0.0%  0.0%  0.0%
    GeneratorWitnessMIR:      0  0.0%,  0.0%   0.0%  0.0%  0.0%
    Dynamic           :      7  1.3%,  0.0%   0.0%  0.0%  0.0%
    Closure           :      2  0.4%,  0.0%   0.0%  0.0%  0.0%
    Tuple             :      3  0.6%,  0.0%   0.0%  0.0%  0.0%
    Bound             :      0  0.0%,  0.0%   0.0%  0.0%  0.0%
    Param             :     29  5.4%,  0.0%   0.0%  0.0%  0.0%
    Infer             :    126 23.6%, 18.7%   0.0%  0.0%  0.0%
    Alias             :     12  2.2%,  0.0%   0.0%  0.0%  0.0%
    Foreign           :      2  0.4%,  0.0%   0.0%  0.0%  0.0%
                  total    535        20.6%  15.1%  0.0%  0.0%
InternalSubsts interner: #302
Region interner: #624
Const Allocation interner: #13
Layout interner: #28

thread 'main' panicked at 'no filesystem on wasm', library/std/src/sys/wasi/os.rs:228:5
stack backtrace:

error: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md

note: rustc 1.72.0-dev running on wasm32-wasi

note: compiler flags: -C panic=abort -C codegen-units=1

query stack during panic:
end of query stack

Done

[bjorn3]

That panic is expected. It fails after writing the object files and before attempting to link. Linking doesn't work yet as there is no linker compiled for wasi. You should still see links to download the object files.

[jozanza]

Oh awesome. Is it possible to get it to output a .wasm file via the wasm32-unknown-unknown target somehow? My ultimate goal is to compile some rust source code to a wasm binary in the browser.

[bjorn3]

LLVM can't currently be compiled for wasm, so I used my cranelift based backend for codegen. Cranelift doesn't yet support compiling to wasm modules: bytecodealliance/wasmtime#2566

[bjorn3]

As of 9289c4c it is now able to reach the exact point where the linker would be invoked again, rather than panicking during linking preparation. I have also verified that it produces an object file and presents a download link for this. Compiling to wasm is tracked by bytecodealliance/wasmtime#2566.