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wasm_interp: tests for memory allocation instructions

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Brian Carroll 2022-11-25 16:51:36 +00:00
parent 06f3726e35
commit 2bd67a3292
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3 changed files with 59 additions and 7 deletions
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20
crates/wasm_interp/src/execute.rs
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@ -36,7 +36,7 @@ impl<'a> ExecutionState<'a> {
{
let mem_bytes = memory_pages * MemorySection::PAGE_SIZE;
ExecutionState {
memory: Vec::with_capacity_in(mem_bytes as usize, arena),
memory: Vec::from_iter_in(iter::repeat(0).take(mem_bytes as usize), arena),
call_stack: CallStack::new(arena),
value_stack: ValueStack::new(arena),
globals: Vec::from_iter_in(globals, arena),
@ -435,9 +435,23 @@ impl<'a> ExecutionState<'a> {
self.value_stack.push(Value::I32(size));
}
GROWMEMORY => {
let old_bytes = self.memory.len() as u32;
let old_pages = old_bytes / MemorySection::PAGE_SIZE as u32;
let grow_pages = self.value_stack.pop_u32();
let grow_bytes = grow_pages as usize * MemorySection::PAGE_SIZE as usize;
self.memory.extend(iter::repeat(0).take(grow_bytes));
let grow_bytes = grow_pages * MemorySection::PAGE_SIZE;
let new_bytes = old_bytes + grow_bytes;
let success = match module.memory.max_bytes().unwrap() {
Some(max_bytes) => new_bytes <= max_bytes,
None => true,
};
if success {
self.memory
.extend(iter::repeat(0).take(grow_bytes as usize));
self.value_stack.push(Value::I32(old_pages as i32));
} else {
self.value_stack.push(Value::I32(-1));
}
}
I32CONST => {
let value = i32::parse((), &module.code.bytes, &mut self.program_counter).unwrap();