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add pick & roll instructions

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This commit is contained in:
Michael Sippel 2024-05-05 18:16:07 +02:00
parent 92fc7ff44b
commit ca6fd92932
Signed by: senvas
GPG key ID: F96CF119C34B64A6
1 changed files with 19 additions and 2 deletions
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19
src/vm.rs
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@ -4,7 +4,7 @@ pub type VM_Word = i64;
#[repr(u64)]
pub enum VM_Instruction {
Nop, Jmp, Call, Branch, Ret,
Lit, Dup, Drop, Swap, Rot,
Lit, Pick, Roll, Dup, Drop, Swap, Rot,
Fetch, Store,
Accept, Emit,
Add, //Sub, Mul, Div, Rem,
@ -103,6 +103,23 @@ impl VM {
let val = char::from(self.data_stack.pop().expect("emit expects value") as u8);
print!("{}", val);
}
VM_Instruction::Pick => {
let n = self.data_stack.pop().expect("pick requires index") as usize;
self.data_stack.push( *self.data_stack.get( self.data_stack.len() - n ).expect("pick invalid index") );
}
VM_Instruction::Roll => {
let n = self.data_stack.pop().expect("pick requires index") as usize;
let l = self.data_stack.len();
if n <= l {
if n > 1 {
let val = self.data_stack.remove( l-n );
self.data_stack.push( val );
}
} else {
eprintln!("stack = {:?}", self.data_stack);
eprintln!("roll invalid index");
}
}
VM_Instruction::Dup => {
self.data_stack.push( *self.data_stack.last().expect("dup expect val") );
}