mirror of
https://github.com/ethereum/go-ethereum.git
synced 2026-06-12 09:51:36 +00:00
add initial code for experimental interpreter loop
This commit is contained in:
Kevaundray Wedderburn
parent
df3d59fc1a
commit
8f1d6205d9
1 changed files with 495 additions and 0 deletions
495
core/vm/interpreter_experimental.go
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495
core/vm/interpreter_experimental.go
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@ -0,0 +1,495 @@
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// 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/params"
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"github.com/holiman/uint256"
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)
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// runExperimental is an optimized interpreter loop using modern optimization
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// techniques taken from reth and gevm.
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// It is used when tracing is disabled and Verkle (EIP-4762) is not active, since
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// the code does not deal with those cases yet.
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//
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// Currently there are two optimizations over the standard loop:
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//
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// 1. Switch dispatch: the standard interpreter calls operation.execute() via a function
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// pointer table. This is an indirect call that the CPU can't predict and the compiler won't
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// inline.
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// runExperimental replaces this with a switch statement for common
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// opcodes, with the opcode logic inlined in each case. The remaining opcodes
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// fall through to the default case which uses the standard jump table.
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// TODO: Eventualy, we can migrate over everything.
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//
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// 2. Gas accumulation: the standard interpreter checks and writes contract.Gas (on the heap)
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// on every opcode.
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// runExperimental instead accumulates gas in a local (register allocated) variable
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// It flushes to contract.Gas only at:
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// - Control flow boundaries (JUMP, JUMPI etc)
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// - Halt points (STOP, end of code)
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// - Error paths (stack underflow/overflow, OOG)
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// - The default fallback (before dynamic-gas opcodes like SLOAD, CALL, etc.)
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//
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// This is safe because:
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// - all inlined opcodes only touch the stack, so executing a few extra ops
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// before detecting OOG has no observable side effects.
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// - the EVM spec consumes all gas on OOG errors regardless.
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// - gas is always flushed before any opcode with external effects (storage, calls, logs)
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// since those go through the default path.
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// - JUMP/JUMPI flush before jumping, so loops can't run indefinitely without a gas check.
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func (evm *EVM) runExperimental(contract *Contract, stack *Stack, mem *Memory, callContext *ScopeContext, jumpTable *JumpTable, code []byte) (ret []byte, err error) {
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var (
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pc uint64
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codeLen = uint64(len(code))
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gasUsed uint64 // accumulated gas for constant-gas opcodes
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)
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for {
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if pc >= codeLen {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, errStopToken
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}
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op := OpCode(code[pc])
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switch op {
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case STOP:
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, errStopToken
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case ADD:
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gasUsed += GasFastestStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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y.Add(&x, y)
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case SUB:
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gasUsed += GasFastestStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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y.Sub(&x, y)
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case MUL:
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gasUsed += GasFastStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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y.Mul(&x, y)
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case DIV:
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gasUsed += GasFastStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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y.Div(&x, y)
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case SDIV:
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gasUsed += GasFastStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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y.SDiv(&x, y)
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case MOD:
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gasUsed += GasFastStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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y.Mod(&x, y)
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case SMOD:
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gasUsed += GasFastStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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y.SMod(&x, y)
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case LT:
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gasUsed += GasFastestStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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if x.Lt(y) {
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y.SetOne()
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} else {
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y.Clear()
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}
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case GT:
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gasUsed += GasFastestStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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if x.Gt(y) {
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y.SetOne()
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} else {
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y.Clear()
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}
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case SLT:
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gasUsed += GasFastestStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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if x.Slt(y) {
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y.SetOne()
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} else {
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y.Clear()
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}
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case SGT:
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gasUsed += GasFastestStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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if x.Sgt(y) {
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y.SetOne()
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} else {
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y.Clear()
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}
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case EQ:
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gasUsed += GasFastestStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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if x.Eq(y) {
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y.SetOne()
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} else {
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y.Clear()
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}
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case ISZERO:
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gasUsed += GasFastestStep
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if stack.len() < 1 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 1}
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}
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x := stack.peek()
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if x.IsZero() {
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x.SetOne()
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} else {
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x.Clear()
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}
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case AND:
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gasUsed += GasFastestStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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y.And(&x, y)
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case OR:
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gasUsed += GasFastestStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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y.Or(&x, y)
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case XOR:
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gasUsed += GasFastestStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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x, y := stack.pop(), stack.peek()
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y.Xor(&x, y)
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case NOT:
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gasUsed += GasFastestStep
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if stack.len() < 1 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 1}
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}
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x := stack.peek()
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x.Not(x)
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case POP:
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gasUsed += GasQuickStep
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if stack.len() < 1 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: 0, required: 1}
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}
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stack.pop()
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case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7:
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gasUsed += GasFastestStep
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n := int(op - DUP1 + 1)
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sLen := stack.len()
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if sLen < n {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: sLen, required: n}
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}
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if sLen >= int(params.StackLimit) {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackOverflow{stackLen: sLen, limit: int(params.StackLimit)}
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}
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stack.dup(n)
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case SWAP1:
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gasUsed += GasFastestStep
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if stack.len() < 2 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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stack.swap1()
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case SWAP2:
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gasUsed += GasFastestStep
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if stack.len() < 3 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 3}
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}
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stack.swap2()
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case SWAP3:
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gasUsed += GasFastestStep
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if stack.len() < 4 {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 4}
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}
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stack.swap3()
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case PUSH1:
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gasUsed += GasFastestStep
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if stack.len() >= int(params.StackLimit) {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackOverflow{stackLen: stack.len(), limit: int(params.StackLimit)}
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}
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pc++
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var val uint256.Int
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if pc < codeLen {
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val.SetUint64(uint64(code[pc]))
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}
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stack.push(&val)
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case PUSH2:
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gasUsed += GasFastestStep
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if stack.len() >= int(params.StackLimit) {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackOverflow{stackLen: stack.len(), limit: int(params.StackLimit)}
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}
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var val uint256.Int
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if pc+2 < codeLen {
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val.SetUint64(uint64(code[pc+1])<<8 | uint64(code[pc+2]))
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} else if pc+1 < codeLen {
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val.SetUint64(uint64(code[pc+1]) << 8)
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}
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stack.push(&val)
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pc += 2
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case PUSH0:
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if !evm.chainRules.IsShanghai {
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return nil, &ErrInvalidOpCode{opcode: op}
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}
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gasUsed += GasQuickStep
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if stack.len() >= int(params.StackLimit) {
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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return nil, &ErrStackOverflow{stackLen: stack.len(), limit: int(params.StackLimit)}
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}
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var zero uint256.Int
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stack.push(&zero)
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case JUMPDEST:
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gasUsed += params.JumpdestGas
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case JUMP:
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gasUsed += GasMidStep
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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gasUsed = 0
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if stack.len() < 1 {
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 1}
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}
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pos := stack.pop()
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if evm.abort.Load() {
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return nil, errStopToken
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}
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if !contract.validJumpdest(&pos) {
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return nil, ErrInvalidJump
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}
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pc = pos.Uint64()
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continue // skip pc++
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case JUMPI:
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gasUsed += GasSlowStep
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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gasUsed = 0
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if stack.len() < 2 {
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return nil, &ErrStackUnderflow{stackLen: stack.len(), required: 2}
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}
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pos, cond := stack.pop(), stack.pop()
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if evm.abort.Load() {
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return nil, errStopToken
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}
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if !cond.IsZero() {
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if !contract.validJumpdest(&pos) {
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return nil, ErrInvalidJump
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}
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pc = pos.Uint64()
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continue // skip pc++
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}
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// Flush gas and fall back to normal dispatch
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default:
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if contract.Gas < gasUsed {
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return nil, ErrOutOfGas
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}
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contract.Gas -= gasUsed
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gasUsed = 0
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// TODO: second return (cost) is for tracing — use it when adding a tracing to runExperimental.
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operation, _, memorySize, gasErr := chargeGasOp(op, evm, contract, stack, mem, jumpTable)
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if gasErr != nil {
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return nil, gasErr
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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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var res []byte
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res, err = operation.execute(&pc, evm, callContext)
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if err != nil {
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return res, err
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}
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}
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pc++
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}
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}
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