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#![cfg_attr(not(feature = "std"), no_std)]
extern crate core;
extern crate alloc;
mod memory;
mod stack;
mod valids;
mod opcode;
mod error;
mod eval;
mod utils;
pub use crate::memory::Memory;
pub use crate::stack::Stack;
pub use crate::valids::Valids;
pub use crate::opcode::{Opcode, ExternalOpcode};
pub use crate::error::{Trap, Capture, ExitReason, ExitSucceed, ExitError, ExitRevert, ExitFatal};
use core::ops::Range;
use alloc::vec::Vec;
use alloc::rc::Rc;
use primitive_types::U256;
use crate::eval::{eval, Control};
pub struct Machine {
data: Rc<Vec<u8>>,
code: Rc<Vec<u8>>,
position: Result<usize, ExitReason>,
return_range: Range<U256>,
valids: Valids,
memory: Memory,
stack: Stack,
}
impl Machine {
pub fn stack(&self) -> &Stack { &self.stack }
pub fn stack_mut(&mut self) -> &mut Stack { &mut self.stack }
pub fn memory(&self) -> &Memory { &self.memory }
pub fn memory_mut(&mut self) -> &mut Memory { &mut self.memory }
pub fn new(
code: Rc<Vec<u8>>,
data: Rc<Vec<u8>>,
stack_limit: usize,
memory_limit: usize
) -> Self {
let valids = Valids::new(&code[..]);
Self {
data,
code,
position: Ok(0),
return_range: U256::zero()..U256::zero(),
valids,
memory: Memory::new(memory_limit),
stack: Stack::new(stack_limit),
}
}
pub fn exit(&mut self, reason: ExitReason) {
self.position = Err(reason);
}
pub fn inspect(&self) -> Option<(Result<Opcode, ExternalOpcode>, &Stack)> {
let position = match self.position {
Ok(position) => position,
Err(_) => return None,
};
self.code.get(position).map(|v| (Opcode::parse(*v), &self.stack))
}
pub fn return_value(&self) -> Vec<u8> {
if self.return_range.start > U256::from(usize::max_value()) {
let mut ret = Vec::new();
ret.resize((self.return_range.end - self.return_range.start).as_usize(), 0);
ret
} else if self.return_range.end > U256::from(usize::max_value()) {
let mut ret = self.memory.get(
self.return_range.start.as_usize(),
usize::max_value() - self.return_range.start.as_usize(),
);
while ret.len() < (self.return_range.end - self.return_range.start).as_usize() {
ret.push(0);
}
ret
} else {
self.memory.get(
self.return_range.start.as_usize(),
(self.return_range.end - self.return_range.start).as_usize(),
)
}
}
pub fn run(&mut self) -> Capture<ExitReason, Trap> {
loop {
match self.step() {
Ok(()) => (),
Err(res) => return res,
}
}
}
pub fn step(&mut self) -> Result<(), Capture<ExitReason, Trap>> {
let position = self.position.map_err(|reason| Capture::Exit(reason))?;
match self.code.get(position).map(|v| Opcode::parse(*v)) {
Some(Ok(opcode)) => {
match eval(self, opcode, position) {
Control::Continue(p) => {
self.position = Ok(position + p);
Ok(())
},
Control::Exit(e) => {
self.position = Err(e);
Err(Capture::Exit(e))
},
Control::Jump(p) => {
self.position = Ok(p);
Ok(())
},
}
},
Some(Err(external)) => {
self.position = Ok(position + 1);
Err(Capture::Trap(external))
},
None => {
self.position = Err(ExitSucceed::Stopped.into());
Err(Capture::Exit(ExitSucceed::Stopped.into()))
},
}
}
}