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// Create a module to work on
var module = new Binaryen.Module();
// Set a memory of initially one page, maximum 100 pages
module.setMemory(1, 100);
// Create a function type for i32 (i32) (i.e., return i32, get an i32 param)
var ii = module.addFunctionType('i', Binaryen.i32, [Binaryen.i32]);
var body = module.block(
null,
[
// if the current memory size is too small, grow it
module.if(
module.i32.lt_u(
module.i32.mul(
module.current_memory(),
module.i32.const(65536)
),
module.local.get(0, Binaryen.i32)
),
module.drop(
module.grow_memory(
module.i32.sub(
module.i32.div_u(
module.i32.add(
module.local.get(0, Binaryen.i32),
module.i32.const(65535)
),
module.i32.const(65536)
),
module.current_memory()
)
)
)
),
// first, clear memory
module.local.set(1, module.i32.const(0)),
module.loop('clear', module.block(null, [
module.i32.store8(0, 1,
module.local.get(1, Binaryen.i32),
module.i32.const(0)
),
module.local.set(1, module.i32.add(
module.local.get(1, Binaryen.i32),
module.i32.const(1)
)),
module.br_if('clear', module.i32.eq(
module.local.get(1, Binaryen.i32),
module.local.get(0, Binaryen.i32)
))
])),
// perform the sieve TODO
// calculate how many primes there are
module.return(module.local.get(0, Binaryen.i32))
],
Binaryen.none
);
// Create the add function
// Note: no additional local variables (that's the [])
module.addFunction('sieve', ii, [Binaryen.i32], body);
// Export the function, so we can call it later (for simplicity we
// export it as the same name as it has internally)
module.addFunctionExport('sieve', 'sieve');
if (!module.validate()) throw 'did not validate :(';
// Print out the text
console.log(module.emitText());
// Optimize the module! This removes the 'return', since the
// output of the add can just fall through
module.optimize();
// Print out the optimized module's text
console.log('optimized:\n\n' + module.emitText());
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