feat: add a hook to optionally execute individual frames

crates/revm/src/builder.rs

@@ -15,7 +15,7 @@ use std::boxed::Box;
 pub struct EvmBuilder<'a, BuilderStage, EXT, DB: Database> {
     context: Context<EXT, DB>,
     /// Handler that will be used by EVM. It contains handle registers
-    handler: Handler<'a, Evm<'a, EXT, DB>, EXT, DB>,
+    handler: Handler<'a, Context<EXT, DB>, EXT, DB>,
     /// Phantom data to mark the stage of the builder.
     phantom: PhantomData<BuilderStage>,
 }
@@ -269,7 +269,7 @@ impl<'a, BuilderStage, EXT, DB: Database> EvmBuilder<'a, BuilderStage, EXT, DB>
     /// Creates the default handler.
     ///
     /// This is useful for adding optimism handle register.
-    fn handler(handler_cfg: HandlerCfg) -> Handler<'a, Evm<'a, EXT, DB>, EXT, DB> {
+    fn handler(handler_cfg: HandlerCfg) -> Handler<'a, Context<EXT, DB>, EXT, DB> {
         Handler::new(handler_cfg)
     }
 
@@ -291,7 +291,7 @@ impl<'a, BuilderStage, EXT, DB: Database> EvmBuilder<'a, BuilderStage, EXT, DB>
     /// ```
     pub fn with_handler(
         self,
-        handler: Handler<'a, Evm<'a, EXT, DB>, EXT, DB>,
+        handler: Handler<'a, Context<EXT, DB>, EXT, DB>,
     ) -> EvmBuilder<'a, BuilderStage, EXT, DB> {
         EvmBuilder {
             context: self.context,
@@ -481,22 +481,18 @@ mod test {
 
                 // we need to use a box to capture the custom context in the instruction
                 let custom_instruction = Box::new(
-                    move |_interp: &mut Interpreter, _host: &mut Evm<'_, (), InMemoryDB>| {
+                    move |_interp: &mut Interpreter, _host: &mut Context<(), InMemoryDB>| {
                         // modify the value
                         let mut inner = custom_context.inner.borrow_mut();
                         *inner += 1;
                     },
                 );
 
-                // need to make esure the instruction table is a boxed instruction table so that we
+                // need to  ensure the instruction table is a boxed instruction table so that we
                 // can insert the custom instruction as a boxed instruction
-                let mut table = handler.take_instruction_table();
-                table = table.map(|mut table| {
-                    // now we can finally insert
-                    table.insert_boxed(0xEF, custom_instruction);
-                    table
-                });
-                handler.instruction_table = table;
+                handler
+                    .instruction_table
+                    .insert_boxed(0xEF, custom_instruction);
             }))
             .build();
 
@@ -528,9 +524,7 @@ mod test {
             })
             .modify_tx_env(|tx| tx.transact_to = TransactTo::Call(to_addr))
             .append_handler_register(|handler| {
-                if let Some(ref mut table) = handler.instruction_table {
-                    table.insert(0xEF, custom_instruction)
-                }
+                handler.instruction_table.insert(0xEF, custom_instruction)
             })
             .build();
 

crates/revm/src/context.rs

@@ -11,7 +11,8 @@ pub use inner_evm_context::InnerEvmContext;
 
 use crate::{
     db::{Database, EmptyDB},
-    primitives::HandlerCfg,
+    interpreter::{Host, LoadAccountResult, SStoreResult, SelfDestructResult},
+    primitives::{Address, Bytecode, Env, HandlerCfg, Log, B256, U256},
 };
 use std::boxed::Box;
 
@@ -94,3 +95,83 @@ where
         }
     }
 }
+
+impl<EXT, DB: Database> Host for Context<EXT, DB> {
+    fn env(&self) -> &Env {
+        &self.evm.env
+    }
+
+    fn env_mut(&mut self) -> &mut Env {
+        &mut self.evm.env
+    }
+
+    fn block_hash(&mut self, number: U256) -> Option<B256> {
+        self.evm
+            .block_hash(number)
+            .map_err(|e| self.evm.error = Err(e))
+            .ok()
+    }
+
+    fn load_account(&mut self, address: Address) -> Option<LoadAccountResult> {
+        self.evm
+            .load_account_exist(address)
+            .map_err(|e| self.evm.error = Err(e))
+            .ok()
+    }
+
+    fn balance(&mut self, address: Address) -> Option<(U256, bool)> {
+        self.evm
+            .balance(address)
+            .map_err(|e| self.evm.error = Err(e))
+            .ok()
+    }
+
+    fn code(&mut self, address: Address) -> Option<(Bytecode, bool)> {
+        self.evm
+            .code(address)
+            .map_err(|e| self.evm.error = Err(e))
+            .ok()
+    }
+
+    fn code_hash(&mut self, address: Address) -> Option<(B256, bool)> {
+        self.evm
+            .code_hash(address)
+            .map_err(|e| self.evm.error = Err(e))
+            .ok()
+    }
+
+    fn sload(&mut self, address: Address, index: U256) -> Option<(U256, bool)> {
+        self.evm
+            .sload(address, index)
+            .map_err(|e| self.evm.error = Err(e))
+            .ok()
+    }
+
+    fn sstore(&mut self, address: Address, index: U256, value: U256) -> Option<SStoreResult> {
+        self.evm
+            .sstore(address, index, value)
+            .map_err(|e| self.evm.error = Err(e))
+            .ok()
+    }
+
+    fn tload(&mut self, address: Address, index: U256) -> U256 {
+        self.evm.tload(address, index)
+    }
+
+    fn tstore(&mut self, address: Address, index: U256, value: U256) {
+        self.evm.tstore(address, index, value)
+    }
+
+    fn log(&mut self, log: Log) {
+        self.evm.journaled_state.log(log);
+    }
+
+    fn selfdestruct(&mut self, address: Address, target: Address) -> Option<SelfDestructResult> {
+        self.evm
+            .inner
+            .journaled_state
+            .selfdestruct(address, target, &mut self.evm.inner.db)
+            .map_err(|e| self.evm.error = Err(e))
+            .ok()
+    }
+}

crates/revm/src/context/inner_evm_context.rs

@@ -114,6 +114,7 @@ impl<DB: Database> InnerEvmContext<DB> {
     }
 
     /// Returns the error by replacing it with `Ok(())`, if any.
+    #[inline]
     pub fn take_error(&mut self) -> Result<(), EVMError<DB::Error>> {
         core::mem::replace(&mut self.error, Ok(()))
     }