277 lines
7.9 KiB
Nim
277 lines
7.9 KiB
Nim
# Nimbus
|
|
# Copyright (c) 2018-2024 Status Research & Development GmbH
|
|
# Licensed under either of
|
|
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
|
|
# http://www.apache.org/licenses/LICENSE-2.0)
|
|
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
|
|
# http://opensource.org/licenses/MIT)
|
|
# at your option. This file may not be copied, modified, or distributed except
|
|
# according to those terms.
|
|
|
|
{.push raises: [].}
|
|
|
|
import
|
|
std/[macros, strformat],
|
|
pkg/[chronicles, chronos, stew/byteutils],
|
|
".."/[constants, db/ledger],
|
|
"."/[code_stream, computation, evm_errors],
|
|
"."/[message, precompiles, state, types],
|
|
./interpreter/op_dispatcher
|
|
|
|
logScope:
|
|
topics = "vm opcode"
|
|
|
|
# ------------------------------------------------------------------------------
|
|
# Private functions
|
|
# ------------------------------------------------------------------------------
|
|
|
|
proc runVM(
|
|
c: VmCpt,
|
|
fork: static EVMFork,
|
|
tracingEnabled: static bool,
|
|
): EvmResultVoid =
|
|
## VM instruction handler main loop - for each fork, a distinc version of
|
|
## this function is instantiated so that selection of fork-specific
|
|
## versions of functions happens only once
|
|
|
|
when tracingEnabled:
|
|
c.prepareTracer()
|
|
|
|
while true:
|
|
{.computedGoto.}
|
|
c.instr = c.code.next()
|
|
|
|
dispatchInstr(fork, tracingEnabled, c.instr, c)
|
|
|
|
ok()
|
|
|
|
macro selectVM(v: VmCpt, fork: EVMFork, tracingEnabled: bool): EvmResultVoid =
|
|
# Generate opcode dispatcher that calls selectVM with a literal for each fork:
|
|
#
|
|
# case fork
|
|
# of A: runVM(v, A, ...)
|
|
# ...
|
|
|
|
let caseStmt = nnkCaseStmt.newTree(fork)
|
|
for fork in EVMFork:
|
|
let
|
|
forkVal = quote:
|
|
`fork`
|
|
call = quote:
|
|
case `tracingEnabled`
|
|
of false: runVM(`v`, `fork`, false)
|
|
of true: runVM(`v`, `fork`, true)
|
|
|
|
caseStmt.add nnkOfBranch.newTree(forkVal, call)
|
|
caseStmt
|
|
|
|
proc beforeExecCall(c: Computation) =
|
|
c.snapshot()
|
|
if c.msg.kind == EVMC_CALL:
|
|
c.vmState.mutateStateDB:
|
|
db.subBalance(c.msg.sender, c.msg.value)
|
|
db.addBalance(c.msg.contractAddress, c.msg.value)
|
|
|
|
proc afterExecCall(c: Computation) =
|
|
## Collect all of the accounts that *may* need to be deleted based on EIP161
|
|
## https://github.com/ethereum/EIPs/blob/master/EIPS/eip-161.md
|
|
## also see: https://github.com/ethereum/EIPs/issues/716
|
|
|
|
if c.isError or c.fork >= FkByzantium:
|
|
if c.msg.contractAddress == RIPEMD_ADDR:
|
|
# Special case to account for geth+parity bug
|
|
c.vmState.stateDB.ripemdSpecial()
|
|
|
|
if c.isSuccess:
|
|
c.commit()
|
|
else:
|
|
c.rollback()
|
|
|
|
proc beforeExecCreate(c: Computation): bool =
|
|
c.vmState.mutateStateDB:
|
|
let nonce = db.getNonce(c.msg.sender)
|
|
if nonce + 1 < nonce:
|
|
let sender = c.msg.sender.toHex
|
|
c.setError(
|
|
"Nonce overflow when sender=" & sender & " wants to create contract", false
|
|
)
|
|
return true
|
|
db.setNonce(c.msg.sender, nonce + 1)
|
|
|
|
# We add this to the access list _before_ taking a snapshot.
|
|
# Even if the creation fails, the access-list change should not be rolled
|
|
# back EIP2929
|
|
if c.fork >= FkBerlin:
|
|
db.accessList(c.msg.contractAddress)
|
|
|
|
c.snapshot()
|
|
|
|
if c.vmState.readOnlyStateDB().contractCollision(c.msg.contractAddress):
|
|
let blurb = c.msg.contractAddress.toHex
|
|
c.setError("Address collision when creating contract address=" & blurb, true)
|
|
c.rollback()
|
|
return true
|
|
|
|
c.vmState.mutateStateDB:
|
|
db.subBalance(c.msg.sender, c.msg.value)
|
|
db.addBalance(c.msg.contractAddress, c.msg.value)
|
|
db.clearStorage(c.msg.contractAddress)
|
|
if c.fork >= FkSpurious:
|
|
# EIP161 nonce incrementation
|
|
db.incNonce(c.msg.contractAddress)
|
|
|
|
return false
|
|
|
|
proc afterExecCreate(c: Computation) =
|
|
if c.isSuccess:
|
|
# This can change `c.isSuccess`.
|
|
c.writeContract()
|
|
# Contract code should never be returned to the caller. Only data from
|
|
# `REVERT` is returned after a create. Clearing in this branch covers the
|
|
# right cases, particularly important with EVMC where it must be cleared.
|
|
if c.output.len > 0:
|
|
c.output = @[]
|
|
|
|
if c.isSuccess:
|
|
c.commit()
|
|
else:
|
|
c.rollback()
|
|
|
|
const MsgKindToOp: array[CallKind, Op] =
|
|
[Call, DelegateCall, CallCode, Create, Create2, EofCreate]
|
|
|
|
func msgToOp(msg: Message): Op =
|
|
if EVMC_STATIC in msg.flags:
|
|
return StaticCall
|
|
MsgKindToOp[msg.kind]
|
|
|
|
proc beforeExec(c: Computation): bool =
|
|
if c.msg.depth > 0:
|
|
c.vmState.captureEnter(
|
|
c,
|
|
msgToOp(c.msg),
|
|
c.msg.sender,
|
|
c.msg.contractAddress,
|
|
c.msg.data,
|
|
c.msg.gas,
|
|
c.msg.value,
|
|
)
|
|
|
|
if not c.msg.isCreate:
|
|
c.beforeExecCall()
|
|
false
|
|
else:
|
|
c.beforeExecCreate()
|
|
|
|
proc afterExec(c: Computation) =
|
|
if not c.msg.isCreate:
|
|
c.afterExecCall()
|
|
else:
|
|
c.afterExecCreate()
|
|
|
|
if c.msg.depth > 0:
|
|
let gasUsed = c.msg.gas - c.gasMeter.gasRemaining
|
|
c.vmState.captureExit(c, c.output, gasUsed, c.errorOpt)
|
|
|
|
# ------------------------------------------------------------------------------
|
|
# Public functions
|
|
# ------------------------------------------------------------------------------
|
|
|
|
template handleEvmError(x: EvmErrorObj) =
|
|
let
|
|
msg = $x.code
|
|
depth = $(c.msg.depth + 1) # plus one to match tracer depth, and avoid confusion
|
|
c.setError("Opcode Dispatch Error: " & msg & ", depth=" & depth, true)
|
|
|
|
proc executeOpcodes*(c: Computation) =
|
|
let fork = c.fork
|
|
|
|
block blockOne:
|
|
let cont = c.continuation
|
|
if cont.isNil:
|
|
let precompile = c.fork.getPrecompile(c.msg.codeAddress)
|
|
if precompile.isSome:
|
|
c.execPrecompile(precompile[])
|
|
break blockOne
|
|
else:
|
|
c.continuation = nil
|
|
cont().isOkOr:
|
|
handleEvmError(error)
|
|
break blockOne
|
|
|
|
let nextCont = c.continuation
|
|
if not nextCont.isNil:
|
|
# Return up to the caller, which will run the child
|
|
# and then call this proc again.
|
|
break blockOne
|
|
|
|
# traceOpCodeEnded is normally called directly after opcode execution
|
|
# but in the case that a continuation is created, it must run after that
|
|
# continuation has finished
|
|
if c.tracingEnabled:
|
|
c.traceOpCodeEnded(c.instr, c.opIndex)
|
|
|
|
if c.instr == Return or c.instr == Revert or c.instr == SelfDestruct:
|
|
break blockOne
|
|
|
|
c.selectVM(fork, c.tracingEnabled).isOkOr:
|
|
handleEvmError(error)
|
|
break blockOne # this break is not needed but make the flow clear
|
|
|
|
if c.isError() and c.continuation.isNil:
|
|
if c.tracingEnabled:
|
|
c.traceError()
|
|
|
|
when vm_use_recursion:
|
|
# Recursion with tiny stack frame per level.
|
|
proc execCallOrCreate*(c: Computation) =
|
|
if not c.beforeExec():
|
|
c.executeOpcodes()
|
|
while not c.continuation.isNil:
|
|
# If there's a continuation, then it's because there's either
|
|
# a child (i.e. call or create)
|
|
when evmc_enabled:
|
|
c.res = c.host.call(c.child[])
|
|
else:
|
|
execCallOrCreate(c.child)
|
|
c.child = nil
|
|
c.executeOpcodes()
|
|
c.afterExec()
|
|
c.dispose()
|
|
|
|
else:
|
|
proc execCallOrCreate*(cParam: Computation) =
|
|
var (c, before) = (cParam, true)
|
|
|
|
# No actual recursion, but simulate recursion including before/after/dispose.
|
|
while true:
|
|
while true:
|
|
if before and c.beforeExec():
|
|
break
|
|
c.executeOpcodes()
|
|
if c.continuation.isNil:
|
|
c.afterExec()
|
|
break
|
|
(before, c.child, c, c.parent) =
|
|
(true, nil.Computation, c.child, c)
|
|
if c.parent.isNil:
|
|
break
|
|
c.dispose()
|
|
(before, c.parent, c) =
|
|
(false, nil.Computation, c.parent)
|
|
|
|
while not c.isNil:
|
|
c.dispose()
|
|
c = c.parent
|
|
|
|
proc postExecComputation*(c: Computation) =
|
|
if c.isSuccess:
|
|
if c.fork < FkLondon:
|
|
# EIP-3529: Reduction in refunds
|
|
c.refundSelfDestruct()
|
|
c.vmState.status = c.isSuccess
|
|
|
|
# ------------------------------------------------------------------------------
|
|
# End
|
|
# ------------------------------------------------------------------------------
|