nandi.uk / gleam

2

Fork of daniellemaywood.uk/gleam — Wasm codegen work

2

gleam / examples / hello_wasm

1 folder 6 files

at 82114d29b104b4feab19c08223fc526ad1ef7892

nandi Implement Wasm codegen enough to run under wasmtime. 1d ago

Implement Wasm codegen enough to run under wasmtime. Lower integers, floats, bools, and strings to Wasm, emit WASI _start that prints main's result, and add examples/hello_wasm as a sample app.

1 day ago

Implement Wasm codegen enough to run under wasmtime. Lower integers, floats, bools, and strings to Wasm, emit WASI _start that prints main's result, and add examples/hello_wasm as a sample app.

1 day ago

Implement Wasm codegen enough to run under wasmtime. Lower integers, floats, bools, and strings to Wasm, emit WASI _start that prints main's result, and add examples/hello_wasm as a sample app.

1 day ago

Implement Wasm codegen enough to run under wasmtime. Lower integers, floats, bools, and strings to Wasm, emit WASI _start that prints main's result, and add examples/hello_wasm as a sample app.

1 day ago

Implement Wasm codegen enough to run under wasmtime. Lower integers, floats, bools, and strings to Wasm, emit WASI _start that prints main's result, and add examples/hello_wasm as a sample app.

1 day ago

Implement Wasm codegen enough to run under wasmtime. Lower integers, floats, bools, and strings to Wasm, emit WASI _start that prints main's result, and add examples/hello_wasm as a sample app.

1 day ago

Implement Wasm codegen enough to run under wasmtime. Lower integers, floats, bools, and strings to Wasm, emit WASI _start that prints main's result, and add examples/hello_wasm as a sample app.

1 day ago

README.md

hello_wasm#

A tiny Gleam program that compiles to WebAssembly and runs under wasmtime via WASI.

The compiler emits a _start entry that calls main and prints its return value to stdout (wasi_snapshot_preview1::fd_write).

Run#

From this directory (builds the in-repo gleam first):

./run.sh

Or step by step:

# from repo root
cargo build -p gleam

# from this directory
../../target/debug/gleam build
wasmtime build/dev/wasm/hello_wasm/hello_wasm.wasm

Expected output:

Hello from Gleam Wasm!
fib(10) = 55

You can also call individual exports:

wasmtime --invoke fib build/dev/wasm/hello_wasm/hello_wasm.wasm 10
# => 55

Notes#

Target is set in gleam.toml: target = "wasm".
main must take no arguments. Supported return types for printing: String, Int, and Bool.
No Hex packages yet — the Wasm backend does not implement enough of the standard library for typical dependencies.