feat(levm): add hooks support and implement `DefaultHook` #1869

lima-limon-inc · 2025-02-03T19:20:56Z

Motivation

LEVM neeeds to support a L2 feature called "Privilege Transactions". To achieve this, some functionality of the EVM has to be able to be customized. In order to achieve this, the EVM will start to support "Hooks" which will modify the prepare_execution and finalize_execution functions of the EVM.

Description
This PR implements the DefaultHook, which is a hook that maintains backwards compatibility with LEVM's previous way of operation; whilst allowing the introduction of future alternative hooks.

In order to achieve this, the following changes were made:

Move eip7702_set_access_code to a standalone function.
- Move access_account to an standalone function.
Move add_intrinsic_gas to a standalone function .
Make beacon_root_contract_call_levm receive a Arc<dyn LevmDatabase> instead of a Arc<StoreWrapper> to make it more like execute_tx_levm.
Replace &Arch with simply Arc in utils.rs.
Implement DefaultHook::prepare_execution.
Implement DefaultHook::finalize_execution.

Closes #1879
Closes #1880
Closes #1629

github-actions · 2025-02-03T19:23:51Z

| File                                                                              | Lines | Diff |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/cmd/ef_tests/levm/deserialize.rs                  | 371   | -34  |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/cmd/ef_tests/levm/report.rs                       | 847   | -64  |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/cmd/ef_tests/levm/runner/levm_runner.rs           | 398   | -20  |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/cmd/ef_tests/levm/runner/revm_runner.rs           | 477   | -36  |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/cmd/ef_tests/levm/types.rs                        | 332   | +64  |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/cmd/ethrex/cli.rs                                 | 132   | -8   |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/common/types/transaction.rs                | 2546  | -3   |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/networking/p2p/discv4/lookup.rs            | 306   | +1   |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/networking/p2p/kademlia.rs                 | 492   | +1   |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/networking/p2p/net.rs                      | 154   | +154 |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/execution_handlers.rs          | 243   | +5   |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/hooks/default_hook.rs          | 295   | +295 |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/hooks/hook.rs                  | 18    | +18  |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/hooks/mod.rs                   | 2     | +2   |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/lib.rs                         | 19    | +1   |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/opcode_handlers/environment.rs | 361   | +20  |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/opcode_handlers/system.rs      | 690   | +41  |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/utils.rs                       | 550   | +116 |
+-----------------------------------------------------------------------------------+-------+------+
| /home/runner/work/ethrex/ethrex/crates/vm/levm/src/vm.rs                          | 419   | -337 |
+-----------------------------------------------------------------------------------+-------+------+

Total lines added: +718
Total lines removed: 502
Total lines changed: 1220

github-actions · 2025-02-03T19:35:25Z

Benchmark Results Comparison

PR Results

Benchmark Results: Factorial

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`revm_Factorial`	233.2 ± 0.7	231.8	234.3	1.00
`levm_Factorial`	910.6 ± 11.4	894.3	923.5	3.90 ± 0.05

Benchmark Results: Factorial - Recursive

Command	Mean [s]	Min [s]	Max [s]	Relative
`revm_FactorialRecursive`	1.492 ± 0.075	1.366	1.583	1.00
`levm_FactorialRecursive`	15.710 ± 0.019	15.675	15.741	10.53 ± 0.53

Benchmark Results: Fibonacci

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`revm_Fibonacci`	205.9 ± 0.8	204.7	207.6	1.00
`levm_Fibonacci`	905.1 ± 7.8	896.6	917.6	4.40 ± 0.04

Benchmark Results: ManyHashes

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`revm_ManyHashes`	8.6 ± 0.0	8.6	8.7	1.00
`levm_ManyHashes`	18.2 ± 0.2	17.9	18.6	2.12 ± 0.03

Benchmark Results: BubbleSort

Command	Mean [s]	Min [s]	Max [s]	Relative
`revm_BubbleSort`	3.221 ± 0.023	3.193	3.275	1.00
`levm_BubbleSort`	6.201 ± 0.083	6.149	6.429	1.93 ± 0.03

Benchmark Results: ERC20 - Transfer

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`revm_ERC20Transfer`	252.7 ± 3.1	247.3	256.3	1.00
`levm_ERC20Transfer`	550.2 ± 2.9	547.2	557.3	2.18 ± 0.03

Benchmark Results: ERC20 - Mint

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`revm_ERC20Mint`	141.7 ± 1.0	140.7	144.3	1.00
`levm_ERC20Mint`	364.5 ± 5.0	359.3	377.0	2.57 ± 0.04

Benchmark Results: ERC20 - Approval

Command	Mean [s]	Min [s]	Max [s]	Relative
`revm_ERC20Approval`	1.040 ± 0.004	1.034	1.045	1.00
`levm_ERC20Approval`	2.054 ± 0.019	2.034	2.092	1.98 ± 0.02

Main Results

Benchmark Results: Factorial

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`revm_Factorial`	234.1 ± 1.7	232.0	238.1	1.00
`levm_Factorial`	897.3 ± 12.0	889.3	930.5	3.83 ± 0.06

Benchmark Results: Factorial - Recursive

Command	Mean [s]	Min [s]	Max [s]	Relative
`revm_FactorialRecursive`	1.454 ± 0.075	1.347	1.553	1.00
`levm_FactorialRecursive`	15.593 ± 0.022	15.561	15.637	10.72 ± 0.56

Benchmark Results: Fibonacci

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`revm_Fibonacci`	203.1 ± 7.0	200.3	222.9	1.00
`levm_Fibonacci`	892.4 ± 11.8	881.2	907.3	4.39 ± 0.16

Benchmark Results: ManyHashes

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`revm_ManyHashes`	8.6 ± 0.1	8.5	8.7	1.00
`levm_ManyHashes`	18.1 ± 0.1	17.9	18.3	2.11 ± 0.02

Benchmark Results: BubbleSort

Command	Mean [s]	Min [s]	Max [s]	Relative
`revm_BubbleSort`	3.212 ± 0.017	3.192	3.237	1.00
`levm_BubbleSort`	6.107 ± 0.044	6.063	6.191	1.90 ± 0.02

Benchmark Results: ERC20 - Transfer

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`revm_ERC20Transfer`	246.4 ± 1.2	245.1	248.5	1.00
`levm_ERC20Transfer`	541.8 ± 5.1	538.1	555.7	2.20 ± 0.02

Benchmark Results: ERC20 - Mint

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
`revm_ERC20Mint`	141.9 ± 0.5	141.2	142.9	1.00
`levm_ERC20Mint`	350.6 ± 1.8	348.8	354.3	2.47 ± 0.02

Benchmark Results: ERC20 - Approval

Command	Mean [s]	Min [s]	Max [s]	Relative
`revm_ERC20Approval`	1.034 ± 0.010	1.027	1.054	1.00
`levm_ERC20Approval`	2.045 ± 0.064	2.011	2.225	1.98 ± 0.07

lima-limon-inc · 2025-02-03T19:56:37Z

Notes/suggestion (simply ideas):

Move eip7702_set_access_code to a standalone function.
- Move access_account to an standalone function.
Move add_intrinsic_gas to a standalone function
Move acces list and authorization list to Environment
Remove & to Arc in utils.rs
Implement prepare_execution default hook
Implement post_execution default hook

github-actions · 2025-02-04T13:06:08Z

tomip01 · 2025-02-06T13:49:37Z

crates/vm/levm/src/vm.rs

+    pub fn new(env: Environment, db: Arc<dyn Database>, cache: CacheDB) -> Result<Self, VMError> {
+        let default_hook: Box<dyn Hook> = Box::new(DefaultHook::new());
+        let hooks = vec![default_hook];
+        Ok(Self {
+            db,
+            env,
+            cache,
+            hooks,
+        })


If the checks are made in the Environment, should we change the new to not return a Result type?

You are totally right Tomi!

Updated here: 8e28a39

tomip01 · 2025-02-06T13:53:39Z

crates/vm/levm/src/environment.rs

+        db: Arc<dyn Database>,
+        value: U256,
+    ) -> Result<Self, VMError> {
+        let to = TxKind::Call(Address::from_low_u64_be(42));


Why is there a fix number? Maybe defining a constant should be better

I saw that in tests.rs 42 was used everywhere. I don't know why 42 specifically, although I have my theories.

However, that can certainly lead to unwanted bugs. I'll change that so that it receives the to as an argument and I'll also add a comment indicating that it is only intended for testing.

Changed here: f9f7a17

tomip01 · 2025-02-06T13:59:19Z

crates/vm/levm/src/environment.rs

+        cache: &mut CacheDB,
+        db: Arc<dyn Database>,
+        value: U256,
+        calldata: Bytes,
+        origin: Address,
+        tx_kind: TxKind,
+        refunded_gas: u64,
+        gas_limit: u64,
+        config: EVMConfig,
+        block_number: U256,
+        coinbase: Address,
+        timestamp: U256,
+        prev_randao: Option<H256>,
+        chain_id: U256,
+        base_fee_per_gas: U256,
+        gas_price: U256, // Effective gas price
+        block_excess_blob_gas: Option<U256>,
+        block_blob_gas_used: Option<U256>,
+        tx_blob_hashes: Vec<H256>,
+        tx_max_priority_fee_per_gas: Option<U256>,
+        tx_max_fee_per_gas: Option<U256>,
+        tx_max_fee_per_blob_gas: Option<U256>,
+        tx_nonce: u64,
+        block_gas_limit: u64,
+        transient_storage: TransientStorage,
+        access_list: AccessList,
+        authorization_list: Option<AuthorizationList>,
+        call_frames: Vec<CallFrame>,
+    ) -> Result<Environment, VMError> {


I think maybe using a struct Transaction containing all the transaction related fields should be better. All this values shouldn't change in the execution.
What do you think?

I think you are totally right! As a matter of fact, I wanted to do that exact same thing (see comment: #1869 (comment)).

I think I simply forgot to do it, I was a big PR as it is. I'll change it.

Thank you Tomi.

I think a struct is needed, if we can use the GenericTransaction from ethrex/core it would be awesome. However, if we have to implement a new struct only to be used by levm or if he integration with GenericTransaction isn't that obvious, we could create an issue and do it in another PR.

fborello-lambda

Amazing!! left 2 minor suggestions

crates/vm/levm/src/utils.rs

crates/vm/vm.rs

fborello-lambda · 2025-02-06T14:07:28Z

crates/vm/levm/src/vm.rs

+    pub fn new(env: Environment, db: Arc<dyn Database>, cache: CacheDB) -> Self {
+        let default_hook: Box<dyn Hook> = Box::new(DefaultHook::new());
+        let hooks = vec![default_hook];
+        Self {
+            db,
+            env,
+            cache,
+            hooks,
        }
    }


Nice, in the future, a method for the VM called append_hook could be handy.
So we can do something like:

VM::new(db, env, cache).append_hook(custom_logic_hook)

tomip01

LGTM, left some comments

crates/vm/levm/src/environment.rs

lima-limon-inc · 2025-02-06T18:58:51Z

What do you think of the new directory structure?

crates/vm/levm/src/hooks.rs

crates/vm/levm/src/hooks/default_hook.rs

Oppen · 2025-02-06T19:59:01Z

crates/vm/levm/src/hooks/default_hook.rs

+    // NOTE: I'm leaving this in case there needs to be a custom new()
+    // function when the post_execution_changes methods is
+    // implemented.


I'm not sure it makes a lot of sense. Either we need a custom new that will take parameters and we'll need to make changes anyway, or we don't need it and we just have a redundant way to construct this.
Also, whenever we leave some constructor method "just in case", I recommend we go for a builder pattern, which is much better for future-proofing an interface than trying to predict the parameters a constructor might have in the future.

Great point @Oppen; I'll remove it ASAP

Done here: 8fc1496

I also made it a unit struct, I think it makes more sense like that. @tomip01 also pointed it out.

Oppen · 2025-02-06T20:20:35Z

crates/vm/levm/src/vm.rs

@@ -166,6 +168,7 @@ pub struct VM {
    pub tx_kind: TxKind,
    pub access_list: AccessList,
    pub authorization_list: Option<AuthorizationList>,
+    pub hooks: Vec<Rc<dyn Hook>>,


This should probably be Arc. Otherwise, db being Arc would be pointless, given this makes the whole thing not Send.

I agree with the above.

Noted! Thanks for the feedback.

Changed here: aa1c1b8

Oppen · 2025-02-06T20:22:42Z

crates/vm/levm/src/vm.rs

+        // NOTE: ATTOW the default hook is created in VM::new(), so
+        // (in theory) _at least_ the default prepare execution should
+        // run
+        for hook in self.hooks.clone() {


I believe this should be enough:

Suggested change

for hook in self.hooks.clone() {

for hook in self.hooks.iter() {

Hmm, I'm getting the following error:

402 | ...or hook in self.hooks.iter() { | ----------------- | | | immutable borrow occurs here | immutable borrow later used here 403 | ... hook.prepare_execution(self, &mut initial_call_frame... | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ mutable borrow occurs here

Oppen · 2025-02-06T20:23:07Z

crates/vm/levm/src/vm.rs

@@ -822,7 +428,9 @@ impl VM {

        report.gas_used = self.gas_used(&initial_call_frame, &report)?;

-        self.finalize_execution(&initial_call_frame, &mut report)?;
+        for hook in self.hooks.clone() {


Same:

Suggested change

for hook in self.hooks.clone() {

for hook in self.hooks.iter() {

Oppen · 2025-02-06T20:23:51Z

crates/vm/levm/src/vm.rs

@@ -928,119 +522,11 @@ impl VM {
            output: Bytes::new(),
        };

-        self.finalize_execution(initial_call_frame, &mut report)?;
+        for hook in self.hooks.clone() {


Suggested change

for hook in self.hooks.clone() {

for hook in self.hooks.iter() {

ilitteri · 2025-02-06T22:30:04Z

crates/vm/levm/src/vm.rs

@@ -166,6 +168,7 @@ pub struct VM {
    pub tx_kind: TxKind,
    pub access_list: AccessList,
    pub authorization_list: Option<AuthorizationList>,
+    pub hooks: Vec<Rc<dyn Hook>>,


I agree with the above.

ilitteri · 2025-02-06T22:33:28Z

crates/vm/levm/src/vm.rs

    pub fn execute(&mut self) -> Result<ExecutionReport, VMError> {
        let mut initial_call_frame = self
            .call_frames
            .pop()
            .ok_or(VMError::Internal(InternalError::CouldNotPopCallframe))?;

-        self.prepare_execution(&mut initial_call_frame)?;


Let's keep this function, as it serves to keep the VM's main function very easy to understand high-level.

Noted! Great point. I'll change it ASAP

Changed here: 62261a6

ilitteri · 2025-02-06T22:33:38Z

crates/vm/levm/src/vm.rs

@@ -822,7 +428,9 @@ impl VM {

        report.gas_used = self.gas_used(&initial_call_frame, &report)?;

-        self.finalize_execution(&initial_call_frame, &mut report)?;


ilitteri · 2025-02-06T22:34:09Z

crates/vm/levm/src/vm.rs

@@ -928,119 +522,11 @@ impl VM {
            output: Bytes::new(),
        };

-        self.finalize_execution(initial_call_frame, &mut report)?;


…he hook logic inside

This reverts commit bc03d54.

…nd put the hook logic inside" This reverts commit 62261a6.

This reverts commit aa1c1b8.

lima-limon-inc · 2025-02-07T13:37:37Z

I reverted the last 3 commits because the Hive tests were failing, I want to check which commit broke it.

This reverts commit 4d6f030.

…and put the hook logic inside" This reverts commit f9a1a39.

github-actions · 2025-02-07T14:16:46Z

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This reverts commit 2245a96.

Add hooks file (maybe later move to a directory)

d8c77f0

Boilerplate for the trait

c4e8085

Add imports and self parameter

093ddfe

lima-limon-inc added 2 commits February 3, 2025 17:22

Make access_account a standalone function in utils.rs

a62d57c

Make eip7702_set_access_code a standalone function insteadof a method

111fb2e

lima-limon-inc force-pushed the feat/hooks branch 2 times, most recently from 7e1c913 to ec41b03 Compare February 4, 2025 13:22

lima-limon-inc self-assigned this Feb 4, 2025

lima-limon-inc added the levm Lambda EVM implementation label Feb 4, 2025

lima-limon-inc changed the title ~~feat(levm): add hooks support~~ feat(levm): add hooks support and implement DefaultHook::prepare_execution Feb 6, 2025

lima-limon-inc marked this pull request as ready for review February 6, 2025 13:37

lima-limon-inc requested a review from a team as a code owner February 6, 2025 13:37

tomip01 reviewed Feb 6, 2025

View reviewed changes

fborello-lambda approved these changes Feb 6, 2025

View reviewed changes

tomip01 approved these changes Feb 6, 2025

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ilitteri reviewed Feb 6, 2025

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crates/vm/levm/src/environment.rs Outdated Show resolved Hide resolved

lima-limon-inc marked this pull request as draft February 6, 2025 14:38

lima-limon-inc and others added 6 commits February 6, 2025 12:04

MOve add_intrinsic_gas to standalone function

9f33e6c

Make VM A parameter for the prepare execution function

30632a5

Apply basic functionality to the default hook

931c579

Add box dyn hook to the VM

87e0925

Change &Arc to Arc

1fd4f02

Change hooks from Vec<Box to Vec<Rc

0279459

lima-limon-inc force-pushed the feat/hooks branch from f9f7a17 to 0279459 Compare February 6, 2025 17:30

Place hooks in a directory instead of all in one file

a849b8f

lima-limon-inc marked this pull request as ready for review February 6, 2025 18:58

fkrause98 approved these changes Feb 6, 2025

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crates/vm/levm/src/hooks.rs Outdated Show resolved Hide resolved

crates/vm/levm/src/hooks.rs Outdated Show resolved Hide resolved

crates/vm/levm/src/hooks.rs Outdated Show resolved Hide resolved

crates/vm/levm/src/hooks/default_hook.rs Show resolved Hide resolved

Oppen reviewed Feb 6, 2025

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Remove new constructor from DefaultHook and make it a unit struct

8fc1496

Oppen reviewed Feb 6, 2025

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ilitteri approved these changes Feb 6, 2025

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Change Vec Hooks to an Arc instead Rc

aa1c1b8

lima-limon-inc force-pushed the feat/hooks branch from ed9a8cd to b41464c Compare February 7, 2025 12:52

Re-store finalize_execution and prepare_execution functions and put t…

62261a6

…he hook logic inside

lima-limon-inc force-pushed the feat/hooks branch from b41464c to 62261a6 Compare February 7, 2025 12:53

lima-limon-inc added 4 commits February 7, 2025 09:56

Fix linter error

bc03d54

Revert "Fix linter error"

4d6f030

This reverts commit bc03d54.

Revert "Re-store finalize_execution and prepare_execution functions a…

f9a1a39

…nd put the hook logic inside" This reverts commit 62261a6.

Revert "Change Vec Hooks to an Arc instead Rc"

2245a96

This reverts commit aa1c1b8.

lima-limon-inc added 3 commits February 7, 2025 10:44

Reapply "Fix linter error"

847fb22

This reverts commit 4d6f030.

Reapply "Re-store finalize_execution and prepare_execution functions …

8919e8d

…and put the hook logic inside" This reverts commit f9a1a39.

Add rc::RC

aacff0b

Reapply "Change Vec Hooks to an Arc instead Rc"

ed6a18d

This reverts commit 2245a96.

lima-limon-inc changed the title ~~feat(levm): add hooks support and implement DefaultHook::prepare_execution~~ feat(levm): add hooks support and implement DefaultHook Feb 7, 2025

lima-limon-inc added this pull request to the merge queue Feb 7, 2025

Merged via the queue into main with commit 8804c4d Feb 7, 2025
24 checks passed

lima-limon-inc deleted the feat/hooks branch February 7, 2025 16:27

	for hook in self.hooks.clone() {
	for hook in self.hooks.iter() {

		@@ -822,7 +428,9 @@ impl VM {

		report.gas_used = self.gas_used(&initial_call_frame, &report)?;

		self.finalize_execution(&initial_call_frame, &mut report)?;

feat(levm): add hooks support and implement DefaultHook #1869

feat(levm): add hooks support and implement DefaultHook #1869

Conversation

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Benchmark Results Comparison

PR Results

Benchmark Results: Factorial

Benchmark Results: Factorial - Recursive

Benchmark Results: Fibonacci

Benchmark Results: ManyHashes

Benchmark Results: BubbleSort

Benchmark Results: ERC20 - Transfer

Benchmark Results: ERC20 - Mint

Benchmark Results: ERC20 - Approval

Main Results

Benchmark Results: Factorial

Benchmark Results: Factorial - Recursive

Benchmark Results: Fibonacci

Benchmark Results: ManyHashes

Benchmark Results: BubbleSort

Benchmark Results: ERC20 - Transfer

Benchmark Results: ERC20 - Mint

Benchmark Results: ERC20 - Approval

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feat(levm): add hooks support and implement `DefaultHook` #1869

feat(levm): add hooks support and implement `DefaultHook` #1869

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