openethereum/rust-evmjit/src/lib.rs
2015-12-22 18:01:13 +01:00

303 lines
7.2 KiB
Rust

//! Bare rust wrapper around evmjit
//!
//! Requires latest version of Ethereum EVM JIT. https://github.com/debris/evmjit
//!
//! ```
//! extern crate evmjit;
//! use evmjit::*;
//!
//! fn main() {
//! let mut context = ContextHandle::new(RuntimeDataHandle::new(), EnvHandle::empty());
//! assert_eq!(context.exec(), ReturnCode::Stop);
//! }
//!
//! ```
extern crate libc;
use std::ops::{Deref, DerefMut};
use self::ffi::*;
pub use self::ffi::JitReturnCode as ReturnCode;
/// Component oriented safe handle to `JitRuntimeData`.
pub struct RuntimeDataHandle {
runtime_data: *mut JitRuntimeData
}
impl RuntimeDataHandle {
/// Creates new handle.
pub fn new() -> Self {
RuntimeDataHandle {
runtime_data: unsafe { evmjit_create_runtime_data() }
}
}
/// Returns immutable reference to runtime data.
pub fn runtime_data(&self) -> &JitRuntimeData {
unsafe { &*self.runtime_data }
}
/// Returns mutable reference to runtime data.
pub fn mut_runtime_data(&mut self) -> &mut JitRuntimeData {
unsafe { &mut *self.runtime_data }
}
}
impl Drop for RuntimeDataHandle {
fn drop(&mut self) {
unsafe { evmjit_destroy_runtime_data(self.runtime_data) }
}
}
/// Safe handle for jit context.
pub struct ContextHandle {
context: *mut JitContext,
_data_handle: RuntimeDataHandle
}
impl ContextHandle {
/// Creates new context handle.
pub fn new(mut data_handle: RuntimeDataHandle, mut env: EnvHandle) -> Self {
let context = unsafe { evmjit_create_context(data_handle.mut_runtime_data(), &mut env) };
ContextHandle {
context: context,
_data_handle: data_handle
}
}
/// Executes context.
pub fn exec(&mut self) -> JitReturnCode {
unsafe { evmjit_exec(self.context) }
}
}
impl Drop for ContextHandle {
fn drop(&mut self) {
unsafe { evmjit_destroy_context(self.context); }
}
}
/// Component oriented wrapper around jit env c interface.
pub trait Env {
fn sload(&self, index: *const JitI256, out_value: *mut JitI256);
fn sstore(&mut self, index: *const JitI256, value: *const JitI256);
fn balance(&self, address: *const JitI256, out_value: *mut JitI256);
fn blockhash(&self, number: *const JitI256, out_hash: *mut JitI256);
fn create(&mut self,
io_gas: *mut u64,
endowment: *const JitI256,
init_beg: *const u8,
init_size: *const u64,
address: *mut JitI256);
fn call(&mut self,
io_gas: *mut u64,
call_gas: *const u64,
receive_address: *const JitI256,
value: *const JitI256,
in_beg: *const u8,
in_size: *const u64,
out_beg: *mut u8,
out_size: *mut u64,
code_address: JitI256) -> bool;
fn extcode(&self, address: *const JitI256, size: *mut u64) -> *const u8;
}
/// C abi compatible wrapper for jit env implementers.
pub struct EnvHandle {
env_impl: Option<Box<Env>>
}
impl EnvHandle {
/// Creates new environment wrapper for given implementation
pub fn new<T>(env_impl: T) -> Self where T: Env + 'static {
EnvHandle { env_impl: Some(Box::new(env_impl)) }
}
/// Creates empty environment.
/// It can be used to for any operations.
pub fn empty() -> Self {
EnvHandle { env_impl: None }
}
}
impl Deref for EnvHandle {
type Target = Box<Env>;
fn deref(&self) -> &Self::Target {
match self.env_impl {
Some(ref env) => env,
None => { panic!(); }
}
}
}
impl DerefMut for EnvHandle {
fn deref_mut(&mut self) -> &mut Self::Target {
match self.env_impl {
Some(ref mut env) => env,
None => { panic!(); }
}
}
}
/// ffi functions
pub mod ffi {
use super::*;
use libc;
/// Jit context struct declaration.
pub enum JitContext {}
#[repr(C)]
#[derive(Debug, Eq, PartialEq)]
/// Jit context execution return code.
pub enum JitReturnCode {
Stop = 0,
Return = 1,
Suicide = 2,
OutOfGas = -1,
LLVMError = -101,
UnexpectedError = -111
}
#[repr(C)]
/// Signed 256 bit integer.
pub struct JitI256 {
pub words: [u64; 4]
}
#[repr(C)]
/// Jit runtime data.
pub struct JitRuntimeData {
pub gas: i64,
pub gas_price: i64,
pub call_data: *const libc::c_char,
pub call_data_size: u64,
pub address: JitI256,
pub caller: JitI256,
pub origin: JitI256,
pub call_value: JitI256,
pub coinbase: JitI256,
pub difficulty: JitI256,
pub gas_limit: JitI256,
pub number: u64,
pub timestamp: i64,
pub code: *const libc::c_char,
pub code_size: u64,
pub code_hash: JitI256
}
#[no_mangle]
pub unsafe extern fn env_sload(env: *const EnvHandle, index: *const JitI256, out_value: *mut JitI256) {
let env = &*env;
env.sload(index, out_value);
}
#[no_mangle]
pub unsafe extern fn env_sstore(env: *mut EnvHandle, index: *const JitI256, value: *const JitI256) {
let env = &mut *env;
env.sstore(index, value);
}
#[no_mangle]
pub unsafe extern fn env_balance(env: *const EnvHandle, address: *const JitI256, out_value: *mut JitI256) {
let env = &*env;
env.balance(address, out_value);
}
#[no_mangle]
pub unsafe extern fn env_blockhash(env: *const EnvHandle, number: *const JitI256, out_hash: *mut JitI256) {
let env = &*env;
env.blockhash(number, out_hash);
}
#[no_mangle]
pub unsafe extern fn env_create(env: *mut EnvHandle,
io_gas: *mut u64,
endowment: *const JitI256,
init_beg: *const u8,
init_size: *const u64,
address: *mut JitI256) {
let env = &mut *env;
env.create(io_gas, endowment, init_beg, init_size, address);
}
#[no_mangle]
pub unsafe extern fn env_call(env: *mut EnvHandle,
io_gas: *mut u64,
call_gas: *const u64,
receive_address: *const JitI256,
value: *const JitI256,
in_beg: *const u8,
in_size: *const u64,
out_beg: *mut u8,
out_size: *mut u64,
code_address: JitI256) -> bool {
let env = &mut *env;
env.call(io_gas, call_gas, receive_address, value, in_beg, in_size, out_beg, out_size, code_address)
}
#[no_mangle]
pub unsafe extern fn env_sha3(_begin: *const u8, _size: *const u64, _out_hash: *const JitI256) {
unimplemented!()
}
#[no_mangle]
pub unsafe extern fn env_extcode(env: *const EnvHandle, address: *const JitI256, size: *mut u64) -> *const u8 {
let env = &*env;
env.extcode(address, size)
}
#[no_mangle]
pub unsafe extern fn env_log(_env: *mut EnvHandle,
_beg: *const u8,
_size: *const u64,
_topic1: *const JitI256,
_topic2: *const JitI256,
_topic3: *const JitI256,
_topic4: *const JitI256) {
unimplemented!()
}
#[link(name="evmjit")]
extern "C" {
pub fn evmjit_create_runtime_data() -> *mut JitRuntimeData;
pub fn evmjit_destroy_runtime_data(data: *mut JitRuntimeData);
pub fn evmjit_destroy_context(context: *mut JitContext);
pub fn evmjit_exec(context: *mut JitContext) -> JitReturnCode;
}
#[link(name="evmjit")]
// EnvHandle does not have to by a C type
#[allow(improper_ctypes)]
extern "C" {
pub fn evmjit_create_context(data: *mut JitRuntimeData, env: *mut EnvHandle) -> *mut JitContext;
}
}
#[test]
fn ffi_test() {
unsafe {
let data = evmjit_create_runtime_data();
let context = evmjit_create_context(data, &mut EnvHandle::empty());
let code = evmjit_exec(context);
assert_eq!(code, JitReturnCode::Stop);
evmjit_destroy_runtime_data(data);
evmjit_destroy_context(context);
}
}
#[test]
fn handle_test() {
let mut context = ContextHandle::new(RuntimeDataHandle::new(), EnvHandle::empty());
assert_eq!(context.exec(), ReturnCode::Stop);
}