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wasm_interp: implement if/else statements

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Brian Carroll 2022-11-26 07:33:17 +00:00
parent 131a9925d0
commit fa1e0a8614
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1 changed files with 33 additions and 7 deletions
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40
crates/wasm_interp/src/execute.rs
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@ -179,9 +179,9 @@ impl<'a> ExecutionState<'a> {
let target_block_depth = self.block_depth - relative_blocks_outward - 1;
loop {
let skip_op = OpCode::from(module.code.bytes[self.program_counter]);
let skipped_op = OpCode::from(module.code.bytes[self.program_counter]);
OpCode::skip_bytes(&module.code.bytes, &mut self.program_counter).unwrap();
match skip_op {
match skipped_op {
BLOCK | LOOP | IF => {
self.block_depth += 1;
}
@ -219,19 +219,45 @@ impl<'a> ExecutionState<'a> {
}
NOP => {}
BLOCK => {
self.fetch_immediate_u32(module); // blocktype
self.fetch_immediate_u32(module); // blocktype (ignored)
self.block_depth += 1;
}
LOOP => {
self.fetch_immediate_u32(module); // blocktype
self.fetch_immediate_u32(module); // blocktype (ignored)
self.block_depth += 1;
}
IF => {
self.fetch_immediate_u32(module); // blocktype
self.fetch_immediate_u32(module); // blocktype (ignored)
let condition = self.value_stack.pop_i32();
self.block_depth += 1;
todo!("{:?} @ {:#x}", op_code, file_offset);
if condition == 0 {
let mut depth = self.block_depth;
loop {
let skipped_op = OpCode::from(module.code.bytes[self.program_counter]);
OpCode::skip_bytes(&module.code.bytes, &mut self.program_counter).unwrap();
match skipped_op {
BLOCK | LOOP | IF => {
depth += 1;
}
END => {
depth -= 1;
}
ELSE => {
if depth == self.block_depth {
break;
}
}
_ => {}
}
}
}
}
ELSE => {
// We only reach this point when we finish executing the "then" block of an IF statement
// (For a false condition, we would have skipped past the ELSE when we saw the IF)
// We don't want to execute the ELSE block, so we skip it, just like `br 0` would.
self.break_forward(0, module);
}
ELSE => todo!("{:?} @ {:#x}", op_code, file_offset),
END => {
if self.block_depth == 0 {
// implicit RETURN at end of function