33 lines
1.1 KiB
Text
33 lines
1.1 KiB
Text
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(module
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;; import from wasi
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;; fn fd_write(fd, *iovs, iovs_len, nwritten) -> bytes_written
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(import "wasi_unstable" "fd_write" (func $fd_write (param i32 i32 i32 i32) (result i32)))
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;; create memory (size = 1 page = 64KiB)
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(memory $foobar 1)
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;; export memory - it's required, but we don't use it so the size is set to 0
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(export "memory" (memory 0))
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;; write string to memory (offset = 8 bytes)
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(data (i32.const 8) "Hello, world!\n")
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(func $main (export "_start")
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;; iov.iov_base - pointer to string (offset = 0 bytes)
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;; the string's offset is 8 bytes in memory
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(i32.store (i32.const 0) (i32.const 8))
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;; iov.iov_len - length of the hello world string (offset = 4 bytes)
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;; the string's length is 14 bytes
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(i32.store (i32.const 4) (i32.const 14))
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(call $fd_write
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(i32.const 1) ;; fd: stdout = 1
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(i32.const 0) ;; data: pointer to memory - this is the first memory we create (index 0)
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(i32.const 1) ;; data_len: there's 1 string
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(i32.const 2468) ;; nwritten: i don't care about this, write it wherever
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)
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drop ;; drop number of bytes written
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)
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)
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