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#[macro_use]
extern crate enum_primitive;
pub mod host;
mod loader;
pub mod types;
pub use crate::loader::{load_and_create, EvmcLoaderErrorCode};
use crate::types::*;
use evmc_sys as ffi;
use std::ffi::CStr;
extern "C" {
fn evmc_create() -> *mut ffi::evmc_instance;
}
pub struct EvmcVm {
handle: *mut ffi::evmc_instance,
host_interface: *mut ffi::evmc_host_interface,
}
impl EvmcVm {
pub fn get_abi_version(&self) -> i32 {
unsafe {
let version: i32 = (*self.handle).abi_version;
version
}
}
pub fn get_name(&self) -> &str {
unsafe {
let c_str: &CStr = CStr::from_ptr((*self.handle).name);
c_str.to_str().unwrap()
}
}
pub fn get_version(&self) -> &str {
unsafe {
let c_str: &CStr = CStr::from_ptr((*self.handle).version);
c_str.to_str().unwrap()
}
}
pub fn destroy(&self) {
unsafe { ((*self.handle).destroy.unwrap())(self.handle) }
}
pub fn execute(
&self,
ctx: &mut dyn host::HostContext,
rev: Revision,
kind: CallKind,
is_static: bool,
depth: i32,
gas: i64,
destination: &Address,
sender: &Address,
input: &Bytes,
value: &Bytes32,
code: &Bytes,
create2_salt: &Bytes32,
) -> (&Bytes, i64, StatusCode) {
let mut ext_ctx = host::ExtendedContext {
context: ffi::evmc_context {
host: self.host_interface,
},
hctx: ctx,
};
let mut evmc_flags: u32 = 0;
unsafe {
if is_static {
evmc_flags |=
std::mem::transmute::<ffi::evmc_flags, u32>(ffi::evmc_flags::EVMC_STATIC);
}
}
let evmc_message = Box::into_raw(Box::new({
ffi::evmc_message {
kind: kind,
flags: evmc_flags,
depth: depth,
gas: gas,
destination: ffi::evmc_address {
bytes: *destination,
},
sender: ffi::evmc_address { bytes: *sender },
input_data: input.as_ptr(),
input_size: input.len(),
value: ffi::evmc_uint256be { bytes: *value },
create2_salt: ffi::evmc_bytes32 {
bytes: *create2_salt,
},
}
}));
unsafe {
let result = ((*self.handle).execute.unwrap())(
self.handle,
&mut ext_ctx.context,
rev,
evmc_message,
code.as_ptr(),
code.len(),
);
return (
std::slice::from_raw_parts(result.output_data, result.output_size),
result.gas_left,
result.status_code,
);
}
}
pub fn has_capability(&self, capability: Capabilities) -> bool {
unsafe {
std::mem::transmute::<Capabilities, u32>(capability)
== ((*self.handle).get_capabilities.unwrap())(self.handle)
}
}
}
pub fn load(fname: &str) -> (EvmcVm, Result<EvmcLoaderErrorCode, &'static str>) {
let (instance, ec) = load_and_create(fname);
(
EvmcVm {
handle: instance,
host_interface: Box::into_raw(Box::new(host::get_evmc_host_interface())),
},
ec,
)
}
pub fn create() -> EvmcVm {
unsafe {
EvmcVm {
handle: evmc_create(),
host_interface: Box::into_raw(Box::new(host::get_evmc_host_interface())),
}
}
}