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Merge pull request #2661 from OffchainLabs/forwarder-refactor
Forwarder refactor
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| use std::fmt::Display; | ||
|
|
||
| pub enum ParamType { | ||
| I32, | ||
| I64, | ||
| } | ||
|
|
||
| impl Display for ParamType { | ||
| fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { | ||
| use ParamType::*; | ||
| match self { | ||
| I32 => write!(f, "i32"), | ||
| I64 => write!(f, "i64"), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| use ParamType::*; | ||
|
|
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| /// order matters! | ||
| pub const HOSTIOS: [(&str, &[ParamType], &[ParamType]); 42] = [ | ||
| ("read_args", &[I32], &[]), | ||
| ("write_result", &[I32, I32], &[]), | ||
| ("exit_early", &[I32], &[]), | ||
| ("storage_load_bytes32", &[I32, I32], &[]), | ||
| ("storage_cache_bytes32", &[I32, I32], &[]), | ||
| ("storage_flush_cache", &[I32], &[]), | ||
| ("transient_load_bytes32", &[I32, I32], &[]), | ||
| ("transient_store_bytes32", &[I32, I32], &[]), | ||
| ("call_contract", &[I32, I32, I32, I32, I64, I32], &[I32]), | ||
| ("delegate_call_contract", &[I32, I32, I32, I64, I32], &[I32]), | ||
| ("static_call_contract", &[I32, I32, I32, I64, I32], &[I32]), | ||
| ("create1", &[I32, I32, I32, I32, I32], &[]), | ||
| ("create2", &[I32, I32, I32, I32, I32, I32], &[]), | ||
| ("read_return_data", &[I32, I32, I32], &[I32]), | ||
| ("return_data_size", &[], &[I32]), | ||
| ("emit_log", &[I32, I32, I32], &[]), | ||
| ("account_balance", &[I32, I32], &[]), | ||
| ("account_code", &[I32, I32, I32, I32], &[I32]), | ||
| ("account_code_size", &[I32], &[I32]), | ||
| ("account_codehash", &[I32, I32], &[]), | ||
| ("evm_gas_left", &[], &[I64]), | ||
| ("evm_ink_left", &[], &[I64]), | ||
| ("block_basefee", &[I32], &[]), | ||
| ("chainid", &[], &[I64]), | ||
| ("block_coinbase", &[I32], &[]), | ||
| ("block_gas_limit", &[], &[I64]), | ||
| ("block_number", &[], &[I64]), | ||
| ("block_timestamp", &[], &[I64]), | ||
| ("contract_address", &[I32], &[]), | ||
| ("math_div", &[I32, I32], &[]), | ||
| ("math_mod", &[I32, I32], &[]), | ||
| ("math_pow", &[I32, I32], &[]), | ||
| ("math_add_mod", &[I32, I32, I32], &[]), | ||
| ("math_mul_mod", &[I32, I32, I32], &[]), | ||
| ("msg_reentrant", &[], &[I32]), | ||
| ("msg_sender", &[I32], &[]), | ||
| ("msg_value", &[I32], &[]), | ||
| ("native_keccak256", &[I32, I32, I32], &[]), | ||
| ("tx_gas_price", &[I32], &[]), | ||
| ("tx_ink_price", &[], &[I32]), | ||
| ("tx_origin", &[I32], &[]), | ||
| ("pay_for_memory_grow", &[I32], &[]), | ||
| ]; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| use arbutil::hostios::HOSTIOS; | ||
| use std::{env, fmt::Write, fs, path::Path}; | ||
|
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| pub fn gen_forwarder(out_path: &Path) { | ||
| let mut wat = String::new(); | ||
| macro_rules! wln { | ||
| ($($text:tt)*) => { | ||
| writeln!(wat, $($text)*).unwrap(); | ||
| }; | ||
| } | ||
| let s = " "; | ||
|
|
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| wln!("(module"); | ||
|
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| macro_rules! group { | ||
| ($list:expr, $kind:expr) => { | ||
| (!$list.is_empty()) | ||
| .then(|| { | ||
| format!( | ||
| " ({} {})", | ||
| $kind, | ||
| $list | ||
| .iter() | ||
| .map(|x| x.to_string()) | ||
| .collect::<Vec<_>>() | ||
| .join(" ") | ||
| ) | ||
| }) | ||
| .unwrap_or_default() | ||
| }; | ||
| } | ||
|
|
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| wln!("{s};; symbols to re-export"); | ||
| for (name, ins, outs) in HOSTIOS { | ||
| let params = group!(ins, "param"); | ||
| let result = group!(outs, "result"); | ||
| wln!(r#"{s}(import "user_host" "{name}" (func $_{name}{params}{result}))"#); | ||
| } | ||
| wln!(); | ||
|
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| wln!("{s};; reserved offsets for future user_host imports"); | ||
| for i in HOSTIOS.len()..512 { | ||
| wln!("{s}(func $reserved_{i} unreachable)"); | ||
| } | ||
| wln!(); | ||
|
|
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| wln!( | ||
| "{s};; allows user_host to request a trap\n\ | ||
| {s}(global $trap (mut i32) (i32.const 0))\n\ | ||
| {s}(func $check\n\ | ||
| {s}{s}global.get $trap ;; see if set\n\ | ||
| {s}{s}(global.set $trap (i32.const 0)) ;; reset the flag\n\ | ||
| {s}{s}(if (then (unreachable)))\n\ | ||
| {s})\n\ | ||
| {s}(func (export \"forward__set_trap\")\n\ | ||
| {s}{s}(global.set $trap (i32.const 1))\n\ | ||
| {s})\n" | ||
| ); | ||
|
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| wln!("{s};; user linkage"); | ||
| for (name, ins, outs) in HOSTIOS { | ||
| let params = group!(ins, "param"); | ||
| let result = group!(outs, "result"); | ||
| wln!("{s}(func (export \"vm_hooks__{name}\"){params}{result}"); | ||
|
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| for i in 0..ins.len() { | ||
| wln!("{s}{s}local.get {i}"); | ||
| } | ||
|
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| wln!( | ||
| "{s}{s}call $_{name}\n\ | ||
| {s}{s}call $check\n\ | ||
| {s})" | ||
| ); | ||
| } | ||
|
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| wln!(")"); | ||
| eprintln!("{}", &wat); | ||
|
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| let wasm = wasmer::wat2wasm(wat.as_bytes()).unwrap(); | ||
|
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| fs::write(out_path, wasm.as_ref()).unwrap(); | ||
| } | ||
|
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| fn main() { | ||
| let out_dir = env::var("OUT_DIR").unwrap(); | ||
| let forwarder_path = Path::new(&out_dir).join("forwarder.wasm"); | ||
| gen_forwarder(&forwarder_path); | ||
| } |
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