431 lines
11 KiB
Rust
431 lines
11 KiB
Rust
//! Bare rust wrapper around evmjit.
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//!
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//! Requires latest version of Ethereum EVM JIT. https://github.com/debris/evmjit
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//!
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//! ```
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//! extern crate evmjit;
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//! use evmjit::*;
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//!
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//! fn main() {
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//! let mut context = ContextHandle::new(RuntimeDataHandle::new(), ExtHandle::empty());
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//! assert_eq!(context.exec(), ReturnCode::Stop);
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//! }
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//! ```
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//!
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//!
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//! To verify that c abi is "imported" correctly, run:
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//!
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//! ```bash
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//! nm your_executable -g | grep ext
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//! ```
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//!
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//! It should give the following output:
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//!
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//! ```bash
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//! 00000001000779e0 T _ext_balance
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//! 0000000100077a10 T _ext_blockhash
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//! 0000000100077a90 T _ext_call
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//! 0000000100077a40 T _ext_create
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//! 0000000100077b50 T _ext_extcode
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//! 0000000100077b80 T _ext_log
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//! 0000000100077b20 T _ext_sha3
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//! 0000000100077980 T _ext_sload
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//! 00000001000779b0 T _ext_sstore
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//! ```
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extern crate tiny_keccak;
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use std::ops::{Deref, DerefMut};
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use self::ffi::*;
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pub use self::ffi::JitReturnCode as ReturnCode;
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pub use self::ffi::JitI256 as I256;
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pub use self::ffi::JitH256 as H256;
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/// Takes care of proper initialization and destruction of `RuntimeData`.
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///
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/// This handle must be used to create runtime data,
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/// cause underneath it's a `C++` structure. Incombatible with rust
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/// structs.
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pub struct RuntimeDataHandle {
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runtime_data: *mut JitRuntimeData
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}
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impl RuntimeDataHandle {
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/// Creates new `RuntimeData` handle.
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pub fn new() -> Self {
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RuntimeDataHandle {
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runtime_data: unsafe { evmjit_create_runtime_data() }
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}
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}
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/// Returns immutable reference to runtime data.
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pub fn runtime_data(&self) -> &JitRuntimeData {
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unsafe { &*self.runtime_data }
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}
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/// Returns mutable reference to runtime data.
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pub fn mut_runtime_data(&mut self) -> &mut JitRuntimeData {
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unsafe { &mut *self.runtime_data }
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}
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}
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impl Drop for RuntimeDataHandle {
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fn drop(&mut self) {
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unsafe { evmjit_destroy_runtime_data(self.runtime_data) }
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}
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}
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impl Deref for RuntimeDataHandle {
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type Target = JitRuntimeData;
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fn deref(&self) -> &Self::Target {
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self.runtime_data()
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}
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}
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impl DerefMut for RuntimeDataHandle {
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fn deref_mut(&mut self) -> &mut Self::Target {
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self.mut_runtime_data()
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}
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}
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/// Takes care of proper initialization and destruction of jit context.
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///
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/// This handle must be used to create context,
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/// cause underneath it's a `C++` structure. Incombatible with rust
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/// structs.
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pub struct ContextHandle {
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context: *mut JitContext,
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data_handle: RuntimeDataHandle,
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}
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impl ContextHandle {
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/// Creates new context handle.
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///
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/// This function is unsafe cause ext lifetime is not considered
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/// We also can't make ExtHandle a member of `ContextHandle` structure,
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/// cause this would be a move operation or it would require a template
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/// lifetime to a reference. Both solutions are not possible.
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pub unsafe fn new(data_handle: RuntimeDataHandle, ext: &mut ExtHandle) -> Self {
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let mut handle = ContextHandle {
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context: std::mem::uninitialized(),
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data_handle: data_handle,
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};
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handle.context = evmjit_create_context(handle.data_handle.mut_runtime_data(), ext);
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handle
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}
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/// Executes context.
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pub fn exec(&mut self) -> JitReturnCode {
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unsafe { evmjit_exec(self.context) }
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}
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/// Returns output data.
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pub fn output_data(&self) -> &[u8] {
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unsafe { std::slice::from_raw_parts(self.data_handle.call_data, self.data_handle.call_data_size as usize) }
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}
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/// Returns address to which funds should be transfered after suicide.
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pub fn suicide_refund_address(&self) -> JitI256 {
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// evmjit reuses data_handle address field to store suicide address
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self.data_handle.address
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}
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/// Returns gas left.
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pub fn gas_left(&self) -> u64 {
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self.data_handle.gas as u64
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}
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}
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impl Drop for ContextHandle {
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fn drop(&mut self) {
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unsafe { evmjit_destroy_context(self.context); }
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}
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}
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/// Component oriented wrapper around jit ext c interface.
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pub trait Ext {
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fn sload(&self, index: *const JitI256, out_value: *mut JitI256);
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fn sstore(&mut self, index: *const JitI256, value: *const JitI256);
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fn balance(&self, address: *const JitH256, out_value: *mut JitI256);
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fn blockhash(&self, number: *const JitI256, out_hash: *mut JitH256);
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fn create(&mut self,
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io_gas: *mut u64,
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endowment: *const JitI256,
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init_beg: *const u8,
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init_size: u64,
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address: *mut JitH256);
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fn call(&mut self,
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io_gas: *mut u64,
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call_gas: u64,
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receive_address: *const JitH256,
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value: *const JitI256,
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in_beg: *const u8,
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in_size: u64,
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out_beg: *mut u8,
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out_size: u64,
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code_address: *const JitH256) -> bool;
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fn log(&mut self,
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beg: *const u8,
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size: u64,
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topic1: *const JitH256,
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topic2: *const JitH256,
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topic3: *const JitH256,
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topic4: *const JitH256);
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fn extcode(&self, address: *const JitH256, size: *mut u64) -> *const u8;
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}
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/// C abi compatible wrapper for jit ext implementers.
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pub struct ExtHandle {
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ext_impl: Option<Box<Ext>>
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}
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impl ExtHandle {
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/// Creates new extironment wrapper for given implementation
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pub fn new<T>(ext_impl: T) -> Self where T: Ext + 'static {
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ExtHandle { ext_impl: Some(Box::new(ext_impl)) }
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}
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/// Creates empty extironment.
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/// It can be used to for any operations.
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pub fn empty() -> Self {
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ExtHandle { ext_impl: None }
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}
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}
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impl Deref for ExtHandle {
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type Target = Box<Ext>;
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fn deref(&self) -> &Self::Target {
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match self.ext_impl {
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Some(ref ext) => ext,
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None => { panic!("Handle is empty!"); }
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}
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}
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}
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impl DerefMut for ExtHandle {
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fn deref_mut(&mut self) -> &mut Self::Target {
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match self.ext_impl {
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Some(ref mut ext) => ext,
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None => { panic!("Handle is empty!"); }
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}
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}
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}
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/// ffi functions
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pub mod ffi {
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use std::slice;
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use std::mem;
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use tiny_keccak::Keccak;
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use super::*;
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/// Jit context struct declaration.
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pub enum JitContext {}
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#[repr(C)]
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#[derive(Debug, Eq, PartialEq)]
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/// Jit context execution return code.
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pub enum JitReturnCode {
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Stop = 0,
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Return = 1,
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Suicide = 2,
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OutOfGas = -1,
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LLVMError = -101,
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UnexpectedError = -111
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}
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#[repr(C)]
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#[derive(Debug, Copy, Clone)]
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/// Signed 256 bit integer.
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pub struct JitI256 {
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pub words: [u64; 4]
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}
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#[repr(C)]
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#[derive(Debug, Copy, Clone)]
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/// Jit Hash
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pub struct JitH256 {
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pub words: [u64; 4]
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}
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impl From<JitH256> for JitI256 {
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fn from(mut hash: JitH256) -> JitI256 {
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unsafe {
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{
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let bytes: &mut [u8] = slice::from_raw_parts_mut(hash.words.as_mut_ptr() as *mut u8, 32);
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bytes.reverse();
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}
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mem::transmute(hash)
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}
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}
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}
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impl From<JitI256> for JitH256 {
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fn from(mut i: JitI256) -> JitH256 {
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unsafe {
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{
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let bytes: &mut [u8] = slice::from_raw_parts_mut(i.words.as_mut_ptr() as *mut u8, 32);
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bytes.reverse();
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}
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mem::transmute(i)
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}
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}
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}
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#[repr(C)]
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#[derive(Debug)]
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/// Jit runtime data.
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pub struct JitRuntimeData {
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pub gas: i64,
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pub gas_price: i64,
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pub call_data: *const u8,
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pub call_data_size: u64,
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pub address: JitI256,
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pub caller: JitI256,
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pub origin: JitI256,
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pub call_value: JitI256,
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pub author: JitI256,
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pub difficulty: JitI256,
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pub gas_limit: JitI256,
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pub number: u64,
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pub timestamp: i64,
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pub code: *const u8,
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pub code_size: u64,
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pub code_hash: JitI256
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}
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#[no_mangle]
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pub unsafe extern "C" fn env_sload(ext: *const ExtHandle, index: *const JitI256, out_value: *mut JitI256) {
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let ext = &*ext;
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ext.sload(index, out_value);
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}
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#[no_mangle]
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pub unsafe extern "C" fn env_sstore(ext: *mut ExtHandle, index: *mut JitI256, value: *mut JitI256) {
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let ext = &mut *ext;
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ext.sstore(index, value);
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}
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#[no_mangle]
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pub unsafe extern "C" fn env_balance(ext: *const ExtHandle, address: *const JitH256, out_value: *mut JitI256) {
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let ext = &*ext;
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ext.balance(address, out_value);
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}
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#[no_mangle]
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pub unsafe extern "C" fn env_blockhash(ext: *const ExtHandle, number: *const JitI256, out_hash: *mut JitH256) {
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let ext = &*ext;
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ext.blockhash(number, out_hash);
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}
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#[no_mangle]
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pub unsafe extern "C" fn env_create(ext: *mut ExtHandle,
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io_gas: *mut u64,
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endowment: *const JitI256,
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init_beg: *const u8,
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init_size: u64,
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address: *mut JitH256) {
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let ext = &mut *ext;
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ext.create(io_gas, endowment, init_beg, init_size, address);
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}
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#[no_mangle]
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pub unsafe extern "C" fn env_call(ext: *mut ExtHandle,
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io_gas: *mut u64,
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call_gas: u64,
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receive_address: *const JitH256,
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value: *const JitI256,
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in_beg: *const u8,
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in_size: u64,
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out_beg: *mut u8,
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out_size: u64,
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code_address: *const JitH256) -> bool {
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let ext = &mut *ext;
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ext.call(io_gas, call_gas, receive_address, value, in_beg, in_size, out_beg, out_size, code_address)
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}
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#[no_mangle]
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pub unsafe extern "C" fn env_sha3(begin: *const u8, size: u64, out_hash: *mut JitH256) {
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let out_hash = &mut *out_hash;
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let input = slice::from_raw_parts(begin, size as usize);
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let outlen = out_hash.words.len() * 8;
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let output = slice::from_raw_parts_mut(out_hash.words.as_mut_ptr() as *mut u8, outlen);
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let mut sha3 = Keccak::new_keccak256();
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sha3.update(input);
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sha3.finalize(output);
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}
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#[no_mangle]
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pub unsafe extern "C" fn env_extcode(ext: *const ExtHandle, address: *const JitH256, size: *mut u64) -> *const u8 {
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let ext = &*ext;
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ext.extcode(address, size)
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}
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#[no_mangle]
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pub unsafe extern "C" fn env_log(ext: *mut ExtHandle,
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beg: *const u8,
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size: u64,
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topic1: *const JitH256,
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topic2: *const JitH256,
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topic3: *const JitH256,
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topic4: *const JitH256) {
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let ext = &mut *ext;
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ext.log(beg, size, topic1, topic2, topic3, topic4);
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}
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#[link(name="evmjit")]
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extern "C" {
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pub fn evmjit_create_runtime_data() -> *mut JitRuntimeData;
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pub fn evmjit_destroy_runtime_data(data: *mut JitRuntimeData);
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pub fn evmjit_destroy_context(context: *mut JitContext);
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pub fn evmjit_exec(context: *mut JitContext) -> JitReturnCode;
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}
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// ExtHandle is not a C type, so we need to allow "improper_ctypes"
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#[link(name="evmjit")]
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#[allow(improper_ctypes)]
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extern "C" {
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pub fn evmjit_create_context(data: *mut JitRuntimeData, ext: *mut ExtHandle) -> *mut JitContext;
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}
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}
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#[test]
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fn ffi_test() {
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unsafe {
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let data = evmjit_create_runtime_data();
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let context = evmjit_create_context(data, &mut ExtHandle::empty());
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let code = evmjit_exec(context);
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assert_eq!(code, JitReturnCode::Stop);
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evmjit_destroy_runtime_data(data);
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evmjit_destroy_context(context);
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}
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}
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#[test]
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fn handle_test() {
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unsafe {
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let mut context = ContextHandle::new(RuntimeDataHandle::new(), &mut ExtHandle::empty());
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assert_eq!(context.exec(), ReturnCode::Stop);
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}
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}
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#[test]
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fn hash_to_int() {
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let h = H256 { words:[0x0123456789abcdef, 0, 0, 0] };
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let i = I256::from(h);
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assert_eq!([0u64, 0, 0, 0xefcdab8967452301], i.words);
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assert_eq!(H256::from(i).words, h.words);
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}
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