hellorevm.rs

#![no_std]
#![no_main]

extern crate alloc;

const SIZE0 : usize = 4*1024*1024;  // GP stack 
// allocate memory for stack

use polkavm_derive::min_stack_size;
min_stack_size!(SIZE0); // 2^24 - 1 - 4096, should not greater than 2^24 - 1 (16777215)

const SIZE1 : usize = 512*1024*1024;  // GP heap --  A.27 134MB (2^15 page -- if you reduce this it will panic)

use simplealloc::SimpleAlloc;
#[global_allocator]
static ALLOCATOR: SimpleAlloc<SIZE1> = SimpleAlloc::new(); // 2^24 - 1 - 4096, should not greater than 2^24 - 1 (16777215)

use revm::{
    bytecode::Bytecode,
    context::Context,
    database::{BenchmarkDB, BENCH_CALLER, BENCH_TARGET},
    primitives::{TxKind, U256},
    ExecuteEvm,
    MainBuilder,
    MainContext,
};


#[panic_handler]
fn panic(_info: &core::panic::PanicInfo) -> ! {
    unsafe {
           core::arch::asm!("unimp", options(noreturn));
    
    }
}

#[polkavm_derive::polkavm_export]
extern "C" fn add_numbers(_a: u32, _b: u32) -> u32 {
/*    let mut evm = Context::mainnet()
    .with_db(BenchmarkDB::new_bytecode(Bytecode::new()))
    .modify_tx_chained(|tx| {
        // Execution globals block hash/gas_limit/coinbase/timestamp..
        tx.caller = BENCH_CALLER;
        tx.kind = TxKind::Call(BENCH_TARGET);
        tx.value = U256::from(911);
    })
    .build_mainnet();
    
    let _res_and_state = evm.replay(); */
    return 0; // Ensure you return properly and close the function
}
/*
fn main() {
        add_numbers(1, 2);
}
*/