I manually generated a WASM module that decompiles by wasm2wat into the following code.
(module
(type (;0;) (func))
(type (;1;) (func (param i32 i32)))
(import "std" "print" (func (;0;) (type 1)))
(func (;1;) (type 0)
i32.const 0
i32.const 13
call 0)
(memory (;0;) 13)
(export "main" (func 0))
(export "data" (memory 0))
(data (;0;) (i32.const 0) "Hello, world!"))
At Node site I instantiate the module, supplying the following imports.
const imports = {
std: {
print: (utf8Offset, utf8Length) => {
console.log([utf8Offset, utf8Length]);
...
},
},
};
When main function runs, console.log reports two zeros instead of 0 and 13. Why?
The problem was solved. I didn't take into account that functions are numbered starting from imports, not from in-module definitions.
main export should look like this:
(export "main" (func 1))