forked from cerc-io/plugeth
243 lines
8.5 KiB
Go
243 lines
8.5 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package vm
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import (
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/math"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/log"
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)
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// Config are the configuration options for the Interpreter
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type Config struct {
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Tracer EVMLogger // Opcode logger
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NoBaseFee bool // Forces the EIP-1559 baseFee to 0 (needed for 0 price calls)
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EnablePreimageRecording bool // Enables recording of SHA3/keccak preimages
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ExtraEips []int // Additional EIPS that are to be enabled
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}
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// ScopeContext contains the things that are per-call, such as stack and memory,
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// but not transients like pc and gas
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type ScopeContext struct {
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Memory *Memory
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Stack *Stack
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Contract *Contract
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}
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// EVMInterpreter represents an EVM interpreter
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type EVMInterpreter struct {
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evm *EVM
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table *JumpTable
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hasher crypto.KeccakState // Keccak256 hasher instance shared across opcodes
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hasherBuf common.Hash // Keccak256 hasher result array shared across opcodes
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readOnly bool // Whether to throw on stateful modifications
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returnData []byte // Last CALL's return data for subsequent reuse
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}
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// NewEVMInterpreter returns a new instance of the Interpreter.
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func NewEVMInterpreter(evm *EVM) *EVMInterpreter {
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// If jump table was not initialised we set the default one.
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var table *JumpTable
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switch {
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case evm.chainRules.IsCancun:
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table = &cancunInstructionSet
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case evm.chainRules.IsShanghai:
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table = &shanghaiInstructionSet
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case evm.chainRules.IsMerge:
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table = &mergeInstructionSet
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case evm.chainRules.IsLondon:
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table = &londonInstructionSet
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case evm.chainRules.IsBerlin:
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table = &berlinInstructionSet
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case evm.chainRules.IsIstanbul:
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table = &istanbulInstructionSet
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case evm.chainRules.IsConstantinople:
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table = &constantinopleInstructionSet
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case evm.chainRules.IsByzantium:
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table = &byzantiumInstructionSet
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case evm.chainRules.IsEIP158:
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table = &spuriousDragonInstructionSet
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case evm.chainRules.IsEIP150:
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table = &tangerineWhistleInstructionSet
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case evm.chainRules.IsHomestead:
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table = &homesteadInstructionSet
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default:
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table = &frontierInstructionSet
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}
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var extraEips []int
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if len(evm.Config.ExtraEips) > 0 {
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// Deep-copy jumptable to prevent modification of opcodes in other tables
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table = copyJumpTable(table)
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}
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for _, eip := range evm.Config.ExtraEips {
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if err := EnableEIP(eip, table); err != nil {
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// Disable it, so caller can check if it's activated or not
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log.Error("EIP activation failed", "eip", eip, "error", err)
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} else {
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extraEips = append(extraEips, eip)
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}
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}
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evm.Config.ExtraEips = extraEips
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return &EVMInterpreter{evm: evm, table: table}
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}
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// Run loops and evaluates the contract's code with the given input data and returns
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// the return byte-slice and an error if one occurred.
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//
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// It's important to note that any errors returned by the interpreter should be
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// considered a revert-and-consume-all-gas operation except for
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// ErrExecutionReverted which means revert-and-keep-gas-left.
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func (in *EVMInterpreter) Run(contract *Contract, input []byte, readOnly bool) (ret []byte, err error) {
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// Increment the call depth which is restricted to 1024
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in.evm.depth++
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defer func() { in.evm.depth-- }()
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// Make sure the readOnly is only set if we aren't in readOnly yet.
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// This also makes sure that the readOnly flag isn't removed for child calls.
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if readOnly && !in.readOnly {
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in.readOnly = true
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defer func() { in.readOnly = false }()
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}
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// Reset the previous call's return data. It's unimportant to preserve the old buffer
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// as every returning call will return new data anyway.
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in.returnData = nil
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// Don't bother with the execution if there's no code.
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if len(contract.Code) == 0 {
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return nil, nil
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}
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var (
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op OpCode // current opcode
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mem = NewMemory() // bound memory
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stack = newstack() // local stack
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callContext = &ScopeContext{
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Memory: mem,
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Stack: stack,
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Contract: contract,
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}
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// For optimisation reason we're using uint64 as the program counter.
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// It's theoretically possible to go above 2^64. The YP defines the PC
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// to be uint256. Practically much less so feasible.
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pc = uint64(0) // program counter
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cost uint64
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// copies used by tracer
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pcCopy uint64 // needed for the deferred EVMLogger
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gasCopy uint64 // for EVMLogger to log gas remaining before execution
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logged bool // deferred EVMLogger should ignore already logged steps
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res []byte // result of the opcode execution function
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debug = in.evm.Config.Tracer != nil
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)
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// Don't move this deferred function, it's placed before the capturestate-deferred method,
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// so that it get's executed _after_: the capturestate needs the stacks before
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// they are returned to the pools
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defer func() {
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returnStack(stack)
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}()
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contract.Input = input
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if debug {
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defer func() {
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if err != nil {
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if !logged {
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in.evm.Config.Tracer.CaptureState(pcCopy, op, gasCopy, cost, callContext, in.returnData, in.evm.depth, err)
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} else {
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in.evm.Config.Tracer.CaptureFault(pcCopy, op, gasCopy, cost, callContext, in.evm.depth, err)
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}
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}
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}()
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}
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// The Interpreter main run loop (contextual). This loop runs until either an
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// explicit STOP, RETURN or SELFDESTRUCT is executed, an error occurred during
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// the execution of one of the operations or until the done flag is set by the
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// parent context.
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for {
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if debug {
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// Capture pre-execution values for tracing.
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logged, pcCopy, gasCopy = false, pc, contract.Gas
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}
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// Get the operation from the jump table and validate the stack to ensure there are
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// enough stack items available to perform the operation.
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op = contract.GetOp(pc)
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operation := in.table[op]
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cost = operation.constantGas // For tracing
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// Validate stack
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if sLen := stack.len(); sLen < operation.minStack {
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return nil, &ErrStackUnderflow{stackLen: sLen, required: operation.minStack}
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} else if sLen > operation.maxStack {
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return nil, &ErrStackOverflow{stackLen: sLen, limit: operation.maxStack}
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}
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if !contract.UseGas(cost) {
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return nil, ErrOutOfGas
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}
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if operation.dynamicGas != nil {
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// All ops with a dynamic memory usage also has a dynamic gas cost.
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var memorySize uint64
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// calculate the new memory size and expand the memory to fit
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// the operation
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// Memory check needs to be done prior to evaluating the dynamic gas portion,
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// to detect calculation overflows
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if operation.memorySize != nil {
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memSize, overflow := operation.memorySize(stack)
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if overflow {
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return nil, ErrGasUintOverflow
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}
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// memory is expanded in words of 32 bytes. Gas
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// is also calculated in words.
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if memorySize, overflow = math.SafeMul(toWordSize(memSize), 32); overflow {
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return nil, ErrGasUintOverflow
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}
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}
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// Consume the gas and return an error if not enough gas is available.
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// cost is explicitly set so that the capture state defer method can get the proper cost
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var dynamicCost uint64
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dynamicCost, err = operation.dynamicGas(in.evm, contract, stack, mem, memorySize)
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cost += dynamicCost // for tracing
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if err != nil || !contract.UseGas(dynamicCost) {
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return nil, ErrOutOfGas
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}
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// Do tracing before memory expansion
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if debug {
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in.evm.Config.Tracer.CaptureState(pc, op, gasCopy, cost, callContext, in.returnData, in.evm.depth, err)
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logged = true
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}
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if memorySize > 0 {
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mem.Resize(memorySize)
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}
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} else if debug {
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in.evm.Config.Tracer.CaptureState(pc, op, gasCopy, cost, callContext, in.returnData, in.evm.depth, err)
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logged = true
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}
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// execute the operation
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res, err = operation.execute(&pc, in, callContext)
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if err != nil {
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break
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}
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pc++
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}
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if err == errStopToken {
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err = nil // clear stop token error
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}
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return res, err
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}
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