[feat] Make the openvm::entry! macro a proc-macro attribute (#1313)

* Make the `openvm::entry!` macro a proc-macro attribute

* Rename `entry` -> `main`

Author: Golovanov399

Cargo.lock

@@ -116,6 +116,7 @@ openvm-sha256-air = { path = "crates/circuits/sha256-air", default-features = fa
 openvm-circuit-primitives = { path = "crates/circuits/primitives", default-features = false }
 openvm-circuit-primitives-derive = { path = "crates/circuits/primitives/derive", default-features = false }
 openvm = { path = "crates/toolchain/openvm", default-features = false }
+openvm-entry = { path = "crates/toolchain/openvm/entry", default-features = false }
 openvm-build = { path = "crates/toolchain/build", default-features = false }
 openvm-instructions = { path = "crates/toolchain/instructions", default-features = false }
 openvm-instructions-derive = { path = "crates/toolchain/instructions/derive", default-features = false }

Cargo.toml

@@ -7,8 +7,7 @@ use base64::engine::{general_purpose, Engine};
 use openvm_json_program::UserProfile;
 use serde_json_core::de::from_str;
 
-openvm::entry!(main);
-
+#[openvm::main]
 fn main() {
     let data_b64 = openvm::io::read_vec();
     let data_b64 = core::str::from_utf8(&data_b64).expect("Invalid UTF-8");

benchmarks/programs/base64_json/src/main.rs

@@ -7,8 +7,7 @@ mod types;
 use bincode::{config::standard, decode_from_slice};
 use types::Players;
 
-openvm::entry!(main);
-
+#[openvm::main]
 fn main() {
     // nothing up our sleeves, state and stream are first 20 digits of pi
     // const STATE: u64 = 3141592653;

benchmarks/programs/bincode/src/main.rs

@@ -3,27 +3,25 @@
 
 extern crate alloc;
 
-use alloy_primitives::{B256, B512, Bytes, keccak256};
+use alloy_primitives::{keccak256, Bytes, B256, B512};
 use k256::{
     ecdsa::{Error, RecoveryId, Signature},
     Secp256k1,
 };
 use openvm::io::read_vec;
 use openvm_algebra_guest::field::FieldExtension;
+use openvm_ecc_guest::AffinePoint;
 #[allow(unused_imports)]
 use openvm_ecc_guest::{
     algebra::IntMod, ecdsa::VerifyingKey, k256::Secp256k1Point, weierstrass::WeierstrassPoint,
 };
-use openvm_ecc_guest::AffinePoint;
 #[allow(unused_imports, clippy::single_component_path_imports)]
 use openvm_keccak256_guest;
 // export native keccak
 use revm_precompile::{
-    Error as PrecompileError, PrecompileOutput, PrecompileResult, utilities::right_pad,
+    utilities::right_pad, Error as PrecompileError, PrecompileOutput, PrecompileResult,
 };
 
-openvm::entry!(main);
-
 openvm_algebra_guest::moduli_macros::moduli_init! {
     "0xFFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFE FFFFFC2F",
     "0xFFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFE BAAEDCE6 AF48A03B BFD25E8C D0364141"
@@ -32,6 +30,7 @@ openvm_ecc_guest::sw_macros::sw_init! {
     Secp256k1Point,
 }
 
+#[openvm::main]
 pub fn main() {
     setup_all_moduli();
     setup_all_curves();
@@ -42,7 +41,6 @@ pub fn main() {
         let recovered = ec_recover_run(&Bytes::from(input), 3000).unwrap();
         assert_eq!(recovered.bytes.as_ref(), expected_address);
     }
-
 }
 
 // OpenVM version of ecrecover precompile.

benchmarks/programs/ecrecover/src/main.rs

@@ -3,8 +3,7 @@
 
 use openvm::io::{read, reveal};
 
-openvm::entry!(main);
-
+#[openvm::main]
 pub fn main() {
     let n: u64 = read();
     let mut a: u64 = 0;

benchmarks/programs/fibonacci/src/main.rs

@@ -5,10 +5,9 @@ use core::mem::transmute;
 
 use regex::Regex;
 
-openvm::entry!(main);
-
 const PATTERN: &str = r"(?m)(\r\n|^)From:([^\r\n]+<)?(?P<email>[^<>]+)>?";
 
+#[openvm::main]
 pub fn main() {
     let data = openvm::io::read_vec();
     let data = core::str::from_utf8(&data).expect("Invalid UTF-8");

benchmarks/programs/regex/src/main.rs

@@ -10,8 +10,7 @@ use alloy_primitives::{address, TxKind, U256};
 use openvm_keccak256_guest; // export native keccak
 use revm::{db::BenchmarkDB, primitives::Bytecode, Evm};
 
-openvm::entry!(main);
-
+#[openvm::main]
 fn main() {
     let mut evm = Evm::builder()
         .with_db(BenchmarkDB::new_bytecode(Bytecode::new()))

benchmarks/programs/revm_transfer/src/main.rs

@@ -9,8 +9,7 @@ use core::hint::black_box;
 use rkyv::{access_unchecked, Archive};
 use types::Players;
 
-openvm::entry!(main);
-
+#[openvm::main]
 fn main() {
     // Uncomment to generate a minecraft save file:
     // // nothing up our sleeves, state and stream are first 20 digits of pi

benchmarks/programs/rkyv/src/main.rs

@@ -27,8 +27,7 @@ The `read` function takes input from the stdin (it also works with OpenVM runtim
 // src/main.rs
 use openvm::io::{read, reveal};
 
-openvm::entry!(main);
-
+#[openvm::main]
 fn main() {
     let n: u64 = read();
     let mut a: u64 = 0;