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add the memory.fill and memory.copy commands to our wasm interpreter

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Folkert 2023-07-08 20:35:33 +02:00
parent 8619f4785b
commit c7ccc2092a
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4 changed files with 128 additions and 2 deletions
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41
crates/wasm_interp/src/instance.rs
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@ -976,6 +976,47 @@ impl<'a, I: ImportDispatcher> Instance<'a, I> {
self.value_store.push(Value::I32(-1));
}
}
MEMORY => {
// the first argument determines exactly which memory operation we have
let op = module.code.bytes[self.program_counter];
self.program_counter += 1;
match op {
8 => {
// memory.init
todo!("WASM instruction: memory.init")
}
9 => {
// data.drop x
todo!("WASM instruction: data.drop")
}
10 => {
// memory.copy
let size = self.value_store.pop_u32()? as usize;
let source = self.value_store.pop_u32()? as usize;
let destination = self.value_store.pop_u32()? as usize;
// skip two zero bytes; in future versions of WebAssembly this byte may be
// used to index additional memories
self.program_counter += 2;
self.memory.copy_within(source..source + size, destination)
}
11 => {
// memory.fill
let size = self.value_store.pop_u32()? as usize;
let byte_value = self.value_store.pop_u32()? as u8;
let destination = self.value_store.pop_u32()? as usize;
// skip a zero byte; in future versions of WebAssembly this byte may be
// used to index additional memories
self.program_counter += 1;
self.memory[destination..][..size].fill(byte_value);
}
other => unreachable!("invalid memory instruction {:?}", other),
}
}
I32CONST => {
let value = i32::parse((), &module.code.bytes, &mut self.program_counter).unwrap();
self.write_debug(value);