feat: vm.Hooks.PreprocessingGasCharge()

[ARR4N]

Why this should be merged

In lieu of modifications to core.IntrinsicGas(), required for support of Warp in SAE.

If we were to introduce variadic options.Options to IntrinsicGas(), it's impossible to guarantee that they would always be passed. The types.Transaction itself isn't actually passed to IntrinsicGas() either, so we can't rely on it to carry payloads/hooks.

How this works

vm.Hooks are extended to include PreprocessingGasCharge(tx common.Hash) (uint64, error), which returns the amount of gas to be charged between core.IntrinsicGas and vm.EVM execution charges. The two entry points to execution, vm.EVM.Call() and vm.EVM.Create() are modified to first spend said charge before running upstream logic.

The new hook is defined on a separate interface definition, embedded in vm.Hooks, to allow types to implement just that method and enforce it with the var _ vm.Preprocessor = (*impl)(nil) pattern.

How this was tested

Integration tests via both core.ApplyTransaction() and core.ApplyMessage(). The former is more comprehensive, while the latter allows for inspection of interim error values.

[Copilot]

Pull Request Overview

Introduces a new EVM preprocessing hook mechanism to charge additional gas before transaction execution begins. This enables charging gas between core.IntrinsicGas and EVM execution, supporting Warp functionality in SAE without modifying the core intrinsic gas calculation.

• Adds PreprocessingGasCharge() method to VM hooks interface for custom gas charging
• Modifies EVM.Call() and EVM.Create() to spend preprocessing gas before execution
• Provides comprehensive integration tests covering both success and error scenarios

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
libevm/ethtest/evm.go	Refactors state database creation into reusable helper function
libevm/ethtest/dummy.go	Adds dummy implementations for chain context and consensus engine
core/vm/preprocess.libevm_test.go	Comprehensive integration tests for preprocessing gas charging
core/vm/interface.libevm.go	Defines StateDBRemainder interface for transaction context access
core/vm/interface.go	Extends StateDB interface with StateDBRemainder methods
core/vm/hooks.libevm.go	Adds Preprocessor interface and NOOPHooks implementation
core/vm/evm.libevm_test.go	Updates test hook to implement new Preprocessor interface
core/vm/evm.libevm.go	Implements preprocessing gas spending logic in EVM operations
core/vm/evm.go	Renames methods to support preprocessing wrapper functions

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