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