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v/examples/wasm_codegen/hello_wasi.v

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import wasm
fn main() {
mut m := wasm.Module{}
m.enable_debug('vlang')
m.new_function_import('wasi_unstable', 'proc_exit', [.i32_t], [])
m.new_function_import('wasi_unstable', 'fd_write', [.i32_t, .i32_t, .i32_t, .i32_t],
[.i32_t])
m.assign_memory('memory', true, 1, none)
m.new_data_segment('CIOVec.str', 0, [u8(8), 0, 0, 0]) // pointer to string
m.new_data_segment('CIOVec.len', 4, [u8(13), 0, 0, 0]) // length of string
m.new_data_segment(none, 8, 'Hello, WASI!\n'.bytes())
mut func := m.new_function('_start', [], [])
{
func.i32_const(1) // stdout
func.i32_const(0) // *iovs
func.i32_const(1) // 1 iov
func.i32_const(-1) // *retptrs
func.call_import('wasi_unstable', 'fd_write')
func.drop()
func.i32_const(0)
func.call_import('wasi_unstable', 'proc_exit')
}
m.commit(func, true)
print(m.compile().bytestr())
}