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#[cfg(feature = "std")]
mod customprinter;
#[cfg(all(feature = "std", feature = "serde-json"))]
mod eip3155;
mod gas;
mod handler_register;
mod noop;
pub use handler_register::{inspector_handle_register, GetInspector};
use crate::{
interpreter::{
CallInputs, CallOutcome, CreateInputs, CreateOutcome, EOFCreateInputs, Interpreter,
},
primitives::{db::Database, Address, Log, U256},
EvmContext,
};
use auto_impl::auto_impl;
/// [Inspector] implementations.
pub mod inspectors {
#[cfg(feature = "std")]
pub use super::customprinter::CustomPrintTracer;
#[cfg(all(feature = "std", feature = "serde-json"))]
pub use super::eip3155::TracerEip3155;
pub use super::gas::GasInspector;
pub use super::noop::NoOpInspector;
}
/// EVM [Interpreter] callbacks.
#[auto_impl(&mut, Box)]
pub trait Inspector<DB: Database> {
/// Called before the interpreter is initialized.
///
/// If `interp.instruction_result` is set to anything other than [crate::interpreter::InstructionResult::Continue] then the execution of the interpreter
/// is skipped.
#[inline]
fn initialize_interp(&mut self, interp: &mut Interpreter, context: &mut EvmContext<DB>) {
let _ = interp;
let _ = context;
}
/// Called on each step of the interpreter.
///
/// Information about the current execution, including the memory, stack and more is available
/// on `interp` (see [Interpreter]).
///
/// # Example
///
/// To get the current opcode, use `interp.current_opcode()`.
#[inline]
fn step(&mut self, interp: &mut Interpreter, context: &mut EvmContext<DB>) {
let _ = interp;
let _ = context;
}
/// Called after `step` when the instruction has been executed.
///
/// Setting `interp.instruction_result` to anything other than [crate::interpreter::InstructionResult::Continue] alters the execution
/// of the interpreter.
#[inline]
fn step_end(&mut self, interp: &mut Interpreter, context: &mut EvmContext<DB>) {
let _ = interp;
let _ = context;
}
/// Called when a log is emitted.
#[inline]
fn log(&mut self, interp: &mut Interpreter, context: &mut EvmContext<DB>, log: &Log) {
let _ = interp;
let _ = context;
let _ = log;
}
/// Called whenever a call to a contract is about to start.
///
/// InstructionResulting anything other than [crate::interpreter::InstructionResult::Continue] overrides the result of the call.
#[inline]
fn call(
&mut self,
context: &mut EvmContext<DB>,
inputs: &mut CallInputs,
) -> Option<CallOutcome> {
let _ = context;
let _ = inputs;
None
}
/// Called when a call to a contract has concluded.
///
/// The returned [CallOutcome] is used as the result of the call.
///
/// This allows the inspector to modify the given `result` before returning it.
#[inline]
fn call_end(
&mut self,
context: &mut EvmContext<DB>,
inputs: &CallInputs,
outcome: CallOutcome,
) -> CallOutcome {
let _ = context;
let _ = inputs;
outcome
}
/// Called when a contract is about to be created.
///
/// If this returns `Some` then the [CreateOutcome] is used to override the result of the creation.
///
/// If this returns `None` then the creation proceeds as normal.
#[inline]
fn create(
&mut self,
context: &mut EvmContext<DB>,
inputs: &mut CreateInputs,
) -> Option<CreateOutcome> {
let _ = context;
let _ = inputs;
None
}
/// Called when a contract has been created.
///
/// InstructionResulting anything other than the values passed to this function (`(ret, remaining_gas,
/// address, out)`) will alter the result of the create.
#[inline]
fn create_end(
&mut self,
context: &mut EvmContext<DB>,
inputs: &CreateInputs,
outcome: CreateOutcome,
) -> CreateOutcome {
let _ = context;
let _ = inputs;
outcome
}
/// Called when EOF creating is called.
///
/// This can happen from create TX or from EOFCREATE opcode.
fn eofcreate(
&mut self,
context: &mut EvmContext<DB>,
inputs: &mut EOFCreateInputs,
) -> Option<CreateOutcome> {
let _ = context;
let _ = inputs;
None
}
/// Called when eof creating has ended.
fn eofcreate_end(
&mut self,
context: &mut EvmContext<DB>,
inputs: &EOFCreateInputs,
outcome: CreateOutcome,
) -> CreateOutcome {
let _ = context;
let _ = inputs;
outcome
}
/// Called when a contract has been self-destructed with funds transferred to target.
#[inline]
fn selfdestruct(&mut self, contract: Address, target: Address, value: U256) {
let _ = contract;
let _ = target;
let _ = value;
}
}