remove evmc code from vm2

why:
  handled by original vm

nimbus/vm2/computation.nim

@@ -23,100 +23,66 @@ import
 when defined(chronicles_log_level):
   import stew/byteutils
 
-when defined(evmc_enabled):
-  import evmc/evmc, evmc_helpers, evmc_api, stew/ranges/ptr_arith
-
 logScope:
   topics = "vm computation"
 
-const
-  evmc_enabled* = defined(evmc_enabled)
-
 template getCoinbase*(c: Computation): EthAddress =
-  when evmc_enabled:
+  block:
-    c.host.getTxContext().block_coinbase
-  else:
     c.vmState.coinbase
 
 template getTimestamp*(c: Computation): int64 =
-  when evmc_enabled:
+  block:
-    c.host.getTxContext().block_timestamp
-  else:
     c.vmState.timestamp.toUnix
 
 template getBlockNumber*(c: Computation): Uint256 =
-  when evmc_enabled:
+  block:
-    c.host.getTxContext().block_number.u256
-  else:
     c.vmState.blockNumber.blockNumberToVmWord
 
 template getDifficulty*(c: Computation): DifficultyInt =
-  when evmc_enabled:
+  block:
-    Uint256.fromEvmc c.host.getTxContext().block_difficulty
-  else:
     c.vmState.difficulty
 
 template getGasLimit*(c: Computation): GasInt =
-  when evmc_enabled:
+  block:
-    c.host.getTxContext().block_gas_limit.GasInt
-  else:
     c.vmState.gasLimit
 
 template getChainId*(c: Computation): uint =
-  when evmc_enabled:
+  block:
-    Uint256.fromEvmc(c.host.getTxContext().chain_id).truncate(uint)
-  else:
     c.vmState.chaindb.config.chainId.uint
 
 template getOrigin*(c: Computation): EthAddress =
-  when evmc_enabled:
+  block:
-    c.host.getTxContext().tx_origin
-  else:
     c.vmState.txOrigin
 
 template getGasPrice*(c: Computation): GasInt =
-  when evmc_enabled:
+  block:
-    Uint256.fromEvmc(c.host.getTxContext().tx_gas_price).truncate(GasInt)
-  else:
     c.vmState.txGasPrice
 
 template getBlockHash*(c: Computation, blockNumber: Uint256): Hash256 =
-  when evmc_enabled:
+  block:
-    c.host.getBlockHash(blockNumber)
-  else:
     c.vmState.getAncestorHash(blockNumber.vmWordToBlockNumber)
 
 template accountExists*(c: Computation, address: EthAddress): bool =
-  when evmc_enabled:
+  block:
-    c.host.accountExists(address)
-  else:
     if c.fork >= FkSpurious:
       not c.vmState.readOnlyStateDB.isDeadAccount(address)
     else:
       c.vmState.readOnlyStateDB.accountExists(address)
 
 template getStorage*(c: Computation, slot: Uint256): Uint256 =
-  when evmc_enabled:
+  block:
-    c.host.getStorage(c.msg.contractAddress, slot)
-  else:
     c.vmState.readOnlyStateDB.getStorage(c.msg.contractAddress, slot)
 
 template getBalance*(c: Computation, address: EthAddress): Uint256 =
-  when evmc_enabled:
+  block:
-    c.host.getBalance(address)
-  else:
     c.vmState.readOnlyStateDB.getBalance(address)
 
 template getCodeSize*(c: Computation, address: EthAddress): uint =
-  when evmc_enabled:
+  block:
-    c.host.getCodeSize(address)
-  else:
     uint(c.vmState.readOnlyStateDB.getCodeSize(address))
 
 template getCodeHash*(c: Computation, address: EthAddress): Hash256 =
-  when evmc_enabled:
+  block:
-    c.host.getCodeHash(address)
-  else:
     let db = c.vmState.readOnlyStateDB
     if not db.accountExists(address) or db.isEmptyAccount(address):
       default(Hash256)
@@ -124,15 +90,11 @@ template getCodeHash*(c: Computation, address: EthAddress): Hash256 =
       db.getCodeHash(address)
 
 template selfDestruct*(c: Computation, address: EthAddress) =
-  when evmc_enabled:
+  block:
-    c.host.selfDestruct(c.msg.contractAddress, address)
-  else:
     c.execSelfDestruct(address)
 
 template getCode*(c: Computation, address: EthAddress): seq[byte] =
-  when evmc_enabled:
+  block:
-    c.host.copyCode(address)
-  else:
     c.vmState.readOnlyStateDB.getCode(address)
 
 proc generateContractAddress(c: Computation, salt: Uint256): EthAddress =
@@ -162,11 +124,6 @@ proc newComputation*(vmState: BaseVMState, message: Message, salt= 0.u256): Comp
   else:
     result.code = newCodeStream(vmState.readOnlyStateDb.getCode(message.codeAddress))
 
-  when evmc_enabled:
-    result.host.init(
-      nim_host_get_interface(),
-      cast[evmc_host_context](result)
-    )
 
 template gasCosts*(c: Computation): untyped =
   c.vmState.gasCosts
@@ -401,6 +358,3 @@ proc prepareTracer*(c: Computation) {.inline.} =
   c.vmState.tracer.prepare(c.msg.depth)
 
 include interpreter_dispatch
-
-when defined(evmc_enabled):
-  include evmc_host

nimbus/vm2/evmc_api.nim

@@ -1,147 +0,0 @@
-# Nimbus
-# Copyright (c) 2019 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.
-
-import evmc/evmc, ./evmc_helpers, eth/common, ../constants
-
-type
-  # we are not using EVMC original signature here
-  # because we want to trick the compiler
-  # and reduce unnecessary conversion/typecast
-  # TODO: move this type definition to nim-evmc
-  #       after we have implemented ABI compatibility test
-  # TODO: investigate the possibility to use Big Endian VMWord
-  #       directly if it's not involving stint computation
-  #       and we can reduce unecessary conversion further
-  nimbus_tx_context* = object
-    tx_gas_price*    : evmc_uint256be # The transaction gas price.
-    tx_origin*       : EthAddress     # The transaction origin account.
-    block_coinbase*  : EthAddress     # The miner of the block.
-    block_number*    : int64          # The block number.
-    block_timestamp* : int64          # The block timestamp.
-    block_gas_limit* : int64          # The block gas limit.
-    block_difficulty*: evmc_uint256be # The block difficulty.
-    chain_id*        : evmc_uint256be # The blockchain's ChainID.
-
-  nimbus_message* = object
-    kind*: evmc_call_kind
-    flags*: uint32
-    depth*: int32
-    gas*: int64
-    destination*: EthAddress
-    sender*: EthAddress
-    input_data*: ptr byte
-    input_size*: uint
-    value*: evmc_uint256be
-    create2_salt*: evmc_bytes32
-
-  nimbus_result* = object
-    status_code*: evmc_status_code
-    gas_left*: int64
-    output_data*: ptr byte
-    output_size*: uint
-    release*: proc(result: var nimbus_result) {.cdecl, gcsafe.}
-    create_address*: EthAddress
-    padding*: array[4, byte]
-
-  nimbus_host_interface* = object
-    account_exists*: proc(context: evmc_host_context, address: EthAddress): bool {.cdecl, gcsafe.}
-    get_storage*: proc(context: evmc_host_context, address: EthAddress, key: ptr evmc_uint256be): evmc_uint256be {.cdecl, gcsafe.}
-    set_storage*: proc(context: evmc_host_context, address: EthAddress,
-                       key, value: ptr evmc_uint256be): evmc_storage_status {.cdecl, gcsafe.}
-    get_balance*: proc(context: evmc_host_context, address: EthAddress): evmc_uint256be {.cdecl, gcsafe.}
-    get_code_size*: proc(context: evmc_host_context, address: EthAddress): uint {.cdecl, gcsafe.}
-    get_code_hash*: proc(context: evmc_host_context, address: EthAddress): Hash256 {.cdecl, gcsafe.}
-    copy_code*: proc(context: evmc_host_context, address: EthAddress,
-                     code_offset: int, buffer_data: ptr byte,
-                     buffer_size: int): int {.cdecl, gcsafe.}
-    selfdestruct*: proc(context: evmc_host_context, address, beneficiary: EthAddress) {.cdecl, gcsafe.}
-    call*: proc(context: evmc_host_context, msg: ptr nimbus_message): nimbus_result {.cdecl, gcsafe.}
-    get_tx_context*: proc(context: evmc_host_context): nimbus_tx_context {.cdecl, gcsafe.}
-    get_block_hash*: proc(context: evmc_host_context, number: int64): Hash256 {.cdecl, gcsafe.}
-    emit_log*: proc(context: evmc_host_context, address: EthAddress,
-                    data: ptr byte, data_size: uint,
-                    topics: ptr evmc_bytes32, topics_count: uint) {.cdecl, gcsafe.}
-
-proc nim_host_get_interface*(): ptr nimbus_host_interface {.importc, cdecl.}
-proc nim_host_create_context*(vmstate: pointer, msg: ptr evmc_message): evmc_host_context {.importc, cdecl.}
-proc nim_host_destroy_context*(ctx: evmc_host_context) {.importc, cdecl.}
-proc nim_create_nimbus_vm*(): ptr evmc_vm {.importc, cdecl.}
-
-type
-  HostContext* = object
-    host*: ptr nimbus_host_interface
-    context*: evmc_host_context
-
-proc init*(x: var HostContext, host: ptr nimbus_host_interface, context: evmc_host_context) =
-  x.host = host
-  x.context = context
-
-proc init*(x: typedesc[HostContext], host: ptr nimbus_host_interface, context: evmc_host_context): HostContext =
-  result.init(host, context)
-
-proc getTxContext*(ctx: HostContext): nimbus_tx_context {.inline.} =
-  ctx.host.get_tx_context(ctx.context)
-
-proc getBlockHash*(ctx: HostContext, number: Uint256): Hash256 =
-  let
-    blockNumber = ctx.getTxContext().block_number.u256
-    ancestorDepth  = blockNumber - number - 1
-  if ancestorDepth >= constants.MAX_PREV_HEADER_DEPTH:
-    return
-  if number >= blockNumber:
-    return
-  ctx.host.get_block_hash(ctx.context, number.truncate(int64))
-
-proc accountExists*(ctx: HostContext, address: EthAddress): bool {.inline.} =
-  ctx.host.account_exists(ctx.context, address)
-
-proc getStorage*(ctx: HostContext, address: EthAddress, key: Uint256): Uint256 =
-  var key = toEvmc(key)
-  Uint256.fromEvmc ctx.host.get_storage(ctx.context, address, key.addr)
-
-proc setStorage*(ctx: HostContext, address: EthAddress,
-                 key, value: Uint256): evmc_storage_status {.inline.} =
-  var
-    key = toEvmc(key)
-    value = toEvmc(value)
-  ctx.host.set_storage(ctx.context, address, key.addr, value.addr)
-
-proc getBalance*(ctx: HostContext, address: EthAddress): Uint256 {.inline.} =
-  Uint256.fromEvmc ctx.host.get_balance(ctx.context, address)
-
-proc getCodeSize*(ctx: HostContext, address: EthAddress): uint {.inline.} =
-  ctx.host.get_code_size(ctx.context, address)
-
-proc getCodeHash*(ctx: HostContext, address: EthAddress): Hash256 {.inline.} =
-  ctx.host.get_code_hash(ctx.context, address)
-
-proc copyCode*(ctx: HostContext, address: EthAddress, codeOffset: int = 0): seq[byte] =
-  let size = ctx.getCodeSize(address).int
-  if size - codeOffset > 0:
-    result = newSeq[byte](size - codeOffset)
-    let read = ctx.host.copy_code(ctx.context, address,
-        codeOffset, result[0].addr, result.len)
-    doAssert(read == result.len)
-
-proc selfdestruct*(ctx: HostContext, address, beneficiary: EthAddress) {.inline.} =
-  ctx.host.selfdestruct(ctx.context, address, beneficiary)
-
-proc emitLog*(ctx: HostContext, address: EthAddress, data: openArray[byte],
-              topics: ptr evmc_bytes32, topicsCount: int) {.inline.} =
-  ctx.host.emit_log(ctx.context, address, if data.len > 0: data[0].unsafeAddr else: nil,
-                    data.len.uint, topics, topicsCount.uint)
-
-proc call*(ctx: HostContext, msg: nimbus_message): nimbus_result {.inline.} =
-  ctx.host.call(ctx.context, msg.unsafeAddr)
-
-#proc vmHost*(vmState: BaseVMState, gasPrice: GasInt, origin: EthAddress): HostContext =
-#  let host = nim_host_get_interface()
-#  let context = nim_host_create_context(cast[pointer](vmState), gasPrice, toEvmc(origin))
-#  result.init(host, context)
-#
-#proc destroy*(hc: HostContext) =
-#  nim_host_destroy_context(hc.context)

nimbus/vm2/evmc_helpers.nim

@@ -1,43 +0,0 @@
-import eth/common, stint, evmc/evmc
-
-const
-  evmc_native* {.booldefine.} = false
-
-func toEvmc*(a: EthAddress): evmc_address {.inline.} =
-  cast[evmc_address](a)
-
-func toEvmc*(h: Hash256): evmc_bytes32 {.inline.} =
-  cast[evmc_bytes32](h)
-
-func toEvmc*(n: Uint256): evmc_uint256be {.inline.} =
-  when evmc_native:
-    cast[evmc_uint256be](n)
-  else:
-    cast[evmc_uint256be](n.toByteArrayBE)
-
-func fromEvmc*(T: type, n: evmc_bytes32): T {.inline.} =
-  when T is Hash256:
-    cast[Hash256](n)
-  elif T is Uint256:
-    when evmc_native:
-      cast[Uint256](n)
-    else:
-      Uint256.fromBytesBE(n.bytes)
-  else:
-    {.error: "cannot convert unsupported evmc type".}
-
-func fromEvmc*(a: evmc_address): EthAddress {.inline.} =
-  cast[EthAddress](a)
-
-when isMainModule:
-  import constants
-  var a: evmc_address
-  a.bytes[19] = 3.byte
-  var na = fromEvmc(a)
-  assert(a == toEvmc(na))
-  var b = stuint(10, 256)
-  var eb = b.toEvmc
-  assert(b == fromEvmc(Uint256, eb))
-  var h = EMPTY_SHA3
-  var eh = toEvmc(h)
-  assert(h == fromEvmc(Hash256, eh))

nimbus/vm2/evmc_host.nim

@@ -1,252 +0,0 @@
-# Nimbus
-# Copyright (c) 2019 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.
-
-proc hostReleaseResultImpl(res: var nimbus_result) {.cdecl, gcsafe.} =
-  dealloc(res.output_data)
-
-proc hostGetTxContextImpl(ctx: Computation): nimbus_tx_context {.cdecl.} =
-  let vmstate = ctx.vmState
-  result.tx_gas_price = toEvmc(vmstate.txGasPrice.u256)
-  result.tx_origin = vmstate.txOrigin
-  result.block_coinbase = vmstate.coinbase
-  result.block_number = vmstate.blockNumber.truncate(int64)
-  result.block_timestamp = vmstate.timestamp.toUnix()
-  result.block_gas_limit = int64(vmstate.blockHeader.gasLimit)
-  result.block_difficulty = toEvmc(vmstate.difficulty)
-  result.chain_id = toEvmc(vmstate.chaindb.config.chainId.uint.u256)
-
-proc hostGetBlockHashImpl(ctx: Computation, number: int64): Hash256 {.cdecl.} =
-  ctx.vmState.getAncestorHash(number.u256)
-
-proc hostAccountExistsImpl(ctx: Computation, address: EthAddress): bool {.cdecl.} =
-  let db = ctx.vmState.readOnlyStateDB
-  if ctx.fork >= FkSpurious:
-    not db.isDeadAccount(address)
-  else:
-    db.accountExists(address)
-
-proc hostGetStorageImpl(ctx: Computation, address: EthAddress, key: var evmc_bytes32): evmc_bytes32 {.cdecl.} =
-  ctx.vmState.accountDB.getStorage(address, Uint256.fromEvmc(key)).toEvmc()
-
-proc sstoreNetGasMetering(ctx: Computation): bool {.inline.} =
-  ctx.fork in {FkConstantinople, FkIstanbul, FkBerlin}
-
-proc hostSetStorageImpl(ctx: Computation, address: EthAddress,
-                        key, value: var evmc_bytes32): evmc_storage_status {.cdecl.} =
-  let
-    slot = Uint256.fromEvmc(key)
-    newValue = Uint256.fromEvmc(value)
-    statedb = ctx.vmState.readOnlyStateDb
-    currValue = statedb.getStorage(address, slot)
-
-  assert address == ctx.msg.contractAddress
-
-  var
-    status = EVMC_STORAGE_MODIFIED
-    gasRefund = 0.GasInt
-    origValue = 0.u256
-
-  if newValue == currValue:
-    status = EVMC_STORAGE_UNCHANGED
-  else:
-    origValue = statedb.getCommittedStorage(address, slot)
-    if origValue == currValue or not ctx.sstoreNetGasMetering():
-      if currValue == 0:
-        status = EVMC_STORAGE_ADDED
-      elif newValue == 0:
-        status = EVMC_STORAGE_DELETED
-    else:
-      status = EVMC_STORAGE_MODIFIED_AGAIN
-    ctx.vmState.mutateStateDB:
-      db.setStorage(address, slot, newValue)
-
-  let gasParam = GasParams(kind: Op.Sstore,
-      s_status: status,
-      s_currentValue: currValue,
-      s_originalValue: origValue
-    )
-  gasRefund = ctx.gasCosts[Sstore].c_handler(newValue, gasParam)[1]
-
-  if gasRefund != 0:
-    ctx.gasMeter.refundGas(gasRefund)
-
-  result = status
-
-proc hostGetBalanceImpl(ctx: Computation, address: EthAddress): evmc_bytes32 {.cdecl.} =
-  ctx.vmState.readOnlyStateDB.getBalance(address).toEvmc()
-
-proc hostGetCodeSizeImpl(ctx: Computation, address: EthAddress): uint {.cdecl.} =
-  ctx.vmState.readOnlyStateDB.getCode(address).len.uint
-
-proc hostGetCodeHashImpl(ctx: Computation, address: EthAddress): Hash256 {.cdecl.} =
-  let db = ctx.vmstate.readOnlyStateDB
-  if not db.accountExists(address):
-    return
-  if db.isEmptyAccount(address):
-    return
-  db.getCodeHash(address)
-
-proc hostCopyCodeImpl(ctx: Computation, address: EthAddress,
-                      codeOffset: int, bufferData: ptr byte,
-                      bufferSize: int): int {.cdecl.} =
-
-  var code = ctx.vmState.readOnlyStateDB.getCode(address)
-
-  # Handle "big offset" edge case.
-  if codeOffset > code.len:
-    return 0
-
-  let maxToCopy = code.len - codeOffset
-  let numToCopy = min(maxToCopy, bufferSize)
-  if numToCopy > 0:
-    copyMem(bufferData, code[codeOffset].addr, numToCopy)
-  result = numToCopy
-
-proc hostSelfdestructImpl(ctx: Computation, address, beneficiary: EthAddress) {.cdecl.} =
-  assert address == ctx.msg.contractAddress
-  ctx.execSelfDestruct(beneficiary)
-
-proc hostEmitLogImpl(ctx: Computation, address: EthAddress,
-                     data: ptr byte, dataSize: int,
-                     topics: UncheckedArray[evmc_bytes32], topicsCount: int) {.cdecl.} =
-  var log: Log
-  if topicsCount > 0:
-    log.topics = newSeq[Topic](topicsCount)
-    for i in 0 ..< topicsCount:
-      log.topics[i] = topics[i].bytes
-
-  log.data = @(makeOpenArray(data, dataSize))
-  log.address = address
-  ctx.addLogEntry(log)
-
-template createImpl(c: Computation, m: nimbus_message, res: nimbus_result) =
-  # TODO: use evmc_message to evoid copy
-  let childMsg = Message(
-    kind: CallKind(m.kind),
-    depth: m.depth,
-    gas: m.gas,
-    sender: m.sender,
-    value: Uint256.fromEvmc(m.value),
-    data: @(makeOpenArray(m.inputData, m.inputSize.int))
-    )
-
-  let child = newComputation(c.vmState, childMsg, Uint256.fromEvmc(m.create2_salt))
-  child.execCallOrCreate()
-
-  if not child.shouldBurnGas:
-    res.gas_left = child.gasMeter.gasRemaining
-
-  if child.isSuccess:
-    c.merge(child)
-    res.status_code = EVMC_SUCCESS
-    res.create_address = child.msg.contractAddress
-  else:
-    res.status_code = if child.shouldBurnGas: EVMC_FAILURE else: EVMC_REVERT
-    if child.output.len > 0:
-      # TODO: can we move the ownership of seq to raw pointer?
-      res.output_size = child.output.len.uint
-      res.output_data = cast[ptr byte](alloc(child.output.len))
-      copyMem(res.output_data, child.output[0].addr, child.output.len)
-      res.release = hostReleaseResultImpl
-
-template callImpl(c: Computation, m: nimbus_message, res: nimbus_result) =
-  let childMsg = Message(
-    kind: CallKind(m.kind),
-    depth: m.depth,
-    gas: m.gas,
-    sender: m.sender,
-    codeAddress: m.destination,
-    contractAddress: if m.kind == EVMC_CALL: m.destination else: c.msg.contractAddress,
-    value: Uint256.fromEvmc(m.value),
-    data: @(makeOpenArray(m.inputData, m.inputSize.int)),
-    flags: MsgFlags(m.flags)
-    )
-
-  let child = newComputation(c.vmState, childMsg)
-  child.execCallOrCreate()
-
-  if not child.shouldBurnGas:
-    res.gas_left = child.gasMeter.gasRemaining
-
-  if child.isSuccess:
-    c.merge(child)
-    res.status_code = EVMC_SUCCESS
-  else:
-    res.status_code = if child.shouldBurnGas: EVMC_FAILURE else: EVMC_REVERT
-
-  if child.output.len > 0:
-    # TODO: can we move the ownership of seq to raw pointer?
-    res.output_size = child.output.len.uint
-    res.output_data = cast[ptr byte](alloc(child.output.len))
-    copyMem(res.output_data, child.output[0].addr, child.output.len)
-    res.release = hostReleaseResultImpl
-
-proc hostCallImpl(ctx: Computation, msg: var nimbus_message): nimbus_result {.cdecl.} =
-  if msg.kind == EVMC_CREATE or msg.kind == EVMC_CREATE2:
-    createImpl(ctx, msg, result)
-  else:
-    callImpl(ctx, msg, result)
-
-proc initHostInterface(): evmc_host_interface =
-  result.account_exists = cast[evmc_account_exists_fn](hostAccountExistsImpl)
-  result.get_storage = cast[evmc_get_storage_fn](hostGetStorageImpl)
-  result.set_storage = cast[evmc_set_storage_fn](hostSetStorageImpl)
-  result.get_balance = cast[evmc_get_balance_fn](hostGetBalanceImpl)
-  result.get_code_size = cast[evmc_get_code_size_fn](hostGetCodeSizeImpl)
-  result.get_code_hash = cast[evmc_get_code_hash_fn](hostGetCodeHashImpl)
-  result.copy_code = cast[evmc_copy_code_fn](hostCopyCodeImpl)
-  result.selfdestruct = cast[evmc_selfdestruct_fn](hostSelfdestructImpl)
-  result.call = cast[evmc_call_fn](hostCallImpl)
-  result.get_tx_context = cast[evmc_get_tx_context_fn](hostGetTxContextImpl)
-  result.get_block_hash = cast[evmc_get_block_hash_fn](hostGetBlockHashImpl)
-  result.emit_log = cast[evmc_emit_log_fn](hostEmitLogImpl)
-
-proc vmSetOptionImpl(vm: ptr evmc_vm, name, value: cstring): evmc_set_option_result {.cdecl.} =
-  return EVMC_SET_OPTION_INVALID_NAME
-
-proc vmExecuteImpl(vm: ptr evmc_vm, host: ptr evmc_host_interface,
-                   ctx: Computation, rev: evmc_revision,
-                   msg: evmc_message, code: ptr byte, code_size: uint): evmc_result {.cdecl.} =
-  discard
-
-proc vmGetCapabilitiesImpl(vm: ptr evmc_vm): evmc_capabilities {.cdecl.} =
-  result.incl(EVMC_CAPABILITY_EVM1)
-
-proc vmDestroyImpl(vm: ptr evmc_vm) {.cdecl.} =
-  dealloc(vm)
-
-const
-  EVMC_HOST_NAME = "nimbus_vm"
-  EVMC_VM_VERSION = "0.0.1"
-
-proc init(vm: var evmc_vm) =
-  vm.abi_version = EVMC_ABI_VERSION
-  vm.name = EVMC_HOST_NAME
-  vm.version = EVMC_VM_VERSION
-  vm.destroy = vmDestroyImpl
-  vm.execute = cast[evmc_execute_fn](vmExecuteImpl)
-  vm.get_capabilities = vmGetCapabilitiesImpl
-  vm.set_option = vmSetOptionImpl
-
-let gHost = initHostInterface()
-proc nim_host_get_interface(): ptr nimbus_host_interface {.exportc, cdecl.} =
-  result = cast[ptr nimbus_host_interface](gHost.unsafeAddr)
-
-proc nim_host_create_context(vmstate: BaseVmState, msg: ptr evmc_message): Computation {.exportc, cdecl.} =
-  #result = HostContext(
-  #  vmState: vmstate,
-  #  gasPrice: GasInt(gasPrice),
-  #  origin: fromEvmc(origin)
-  #)
-  GC_ref(result)
-
-proc nim_host_destroy_context(ctx: Computation) {.exportc, cdecl.} =
-  GC_unref(ctx)
-
-proc nim_create_nimbus_vm(): ptr evmc_vm {.exportc, cdecl.} =
-  result = create(evmc_vm)
-  init(result[])

nimbus/vm2/interpreter/gas_costs.nim

@@ -15,9 +15,6 @@ import
   ./utils/[macros_gen_opcodes, utils_numeric],
   ./opcode_values, ./vm_forks, ../../errors
 
-when defined(evmc_enabled):
-  import evmc/evmc
-
 # Gas Fee Schedule
 # Yellow Paper Appendix G - https://ethereum.github.io/yellowpaper/paper.pdf
 type
@@ -72,8 +69,6 @@ type
 
     case kind*: Op
     of Sstore:
-      when defined(evmc_enabled):
-        s_status*: evmc_storage_status
       s_currentValue*: Uint256
       s_originalValue*: Uint256
     of Call, CallCode, DelegateCall, StaticCall:
@@ -244,32 +239,7 @@ template gasCosts(fork: Fork, prefix, ResultGasCostsName: untyped) =
       CleanRefund = SSTORE_RESET_GAS - SLOAD_GAS # resetting to the original non-zero value
       ClearRefund = FeeSchedule[RefundsClear]# clearing an originally existing storage slot
 
-    when defined(evmc_enabled):
+    block:
-      const
-        sstoreDirty = when fork < FkConstantinople or fork == FkPetersburg: CleanGas
-                      else: DirtyGas
-
-      case gasParams.s_status
-      of EVMC_STORAGE_ADDED: result.gasCost = InitGas
-      of EVMC_STORAGE_MODIFIED: result.gasCost = CleanGas
-      of EVMC_STORAGE_DELETED:
-        result.gasCost = CleanGas
-        result.gasRefund += ClearRefund
-      of EVMC_STORAGE_UNCHANGED: result.gasCost = sstoreDirty
-      of EVMC_STORAGE_MODIFIED_AGAIN:
-        result.gasCost = sstoreDirty
-        if not gasParams.s_originalValue.isZero:
-          if gasParams.s_currentValue.isZero:
-            result.gasRefund -= ClearRefund
-          if value.isZero:
-            result.gasRefund += ClearRefund
-
-        if gasParams.s_originalValue == value:
-          if gasParams.s_originalValue.isZero:
-            result.gasRefund += InitRefund
-          else:
-            result.gasRefund += CleanRefund
-    else:
       when fork < FkConstantinople or fork == FkPetersburg:
         let isStorageEmpty = gasParams.s_currentValue.isZero
 

nimbus/vm2/interpreter/opcodes_impl.nim

@@ -14,9 +14,6 @@ import
   ../../errors, ../../constants,
   ../../db/[db_chain, accounts_cache]
 
-when defined(evmc_enabled):
-  import ../evmc_api, ../evmc_helpers, evmc/evmc
-
 logScope:
   topics = "opcode impl"
 
@@ -439,7 +436,6 @@ op sload, inline = true, slot:
   ## 0x54, Load word from storage.
   push: c.getStorage(slot)
 
-when not evmc_enabled:
 template sstoreImpl(c: Computation, slot, newValue: Uint256) =
     let currentValue {.inject.} = c.getStorage(slot)
 
@@ -455,26 +451,12 @@ when not evmc_enabled:
     c.vmState.mutateStateDB:
       db.setStorage(c.msg.contractAddress, slot, newValue)
 
-when evmc_enabled:
-  template sstoreEvmc(c: Computation, slot, newValue: Uint256) =
-    let
-      currentValue {.inject.} = c.getStorage(slot)
-      status   = c.host.setStorage(c.msg.contractAddress, slot, newValue)
-      gasParam = GasParams(kind: Op.Sstore, s_status: status)
-      gasCost  = c.gasCosts[Sstore].c_handler(newValue, gasParam)[0]
-
-    c.gasMeter.consumeGas(gasCost, &"SSTORE: {c.msg.contractAddress}[{slot}] -> {newValue} ({currentValue})")
-
 op sstore, inline = false, slot, newValue:
   ## 0x55, Save word to storage.
   checkInStaticContext(c)
-
+  block:
-  when evmc_enabled:
-    sstoreEvmc(c, slot, newValue)
-  else:
     sstoreImpl(c, slot, newValue)
 
-when not evmc_enabled:
 template sstoreNetGasMeteringImpl(c: Computation, slot, newValue: Uint256) =
     let stateDB = c.vmState.readOnlyStateDB
     let currentValue {.inject.} = c.getStorage(slot)
@@ -500,18 +482,12 @@ op sstoreEIP2200, inline = false, slot, newValue:
 
   if c.gasMeter.gasRemaining <= SentryGasEIP2200:
     raise newException(OutOfGas, "Gas not enough to perform EIP2200 SSTORE")
-
+  block:
-  when evmc_enabled:
-    sstoreEvmc(c, slot, newValue)
-  else:
     sstoreNetGasMeteringImpl(c, slot, newValue)
 
 op sstoreEIP1283, inline = false, slot, newValue:
   checkInStaticContext(c)
-
+  block:
-  when evmc_enabled:
-    sstoreEvmc(c, slot, newValue)
-  else:
     sstoreNetGasMeteringImpl(c, slot, newValue)
 
 proc jumpImpl(c: Computation, jumpTarget: UInt256) =
@@ -645,29 +621,7 @@ template genCreate(callName: untyped, opCode: Op): untyped =
       createMsgGas -= createMsgGas div 64
     c.gasMeter.consumeGas(createMsgGas, reason="CREATE")
 
-    when evmc_enabled:
+    block:
-      let msg = nimbus_message(
-        kind: callKind.evmc_call_kind,
-        depth: (c.msg.depth + 1).int32,
-        gas: createMsgGas,
-        sender: c.msg.contractAddress,
-        input_data: c.memory.readPtr(memPos),
-        input_size: memLen.uint,
-        value: toEvmc(endowment),
-        create2_salt: toEvmc(salt)
-      )
-
-      var res = c.host.call(msg)
-      c.returnData = @(makeOpenArray(res.outputData, res.outputSize.int))
-      c.gasMeter.returnGas(res.gas_left)
-
-      if res.status_code == EVMC_SUCCESS:
-        c.stack.top(res.create_address)
-
-      # TODO: a good candidate for destructor
-      if not res.release.isNil:
-        res.release(res)
-    else:
       let childMsg = Message(
         kind: callKind,
         depth: c.msg.depth + 1,
@@ -828,36 +782,7 @@ template genCall(callName: untyped, opCode: Op): untyped =
         c.gasMeter.returnGas(childGasLimit)
         return
 
-    when evmc_enabled:
+    block:
-      let msg = nimbus_message(
-        kind: callKind.evmc_call_kind,
-        depth: (c.msg.depth + 1).int32,
-        gas: childGasLimit,
-        sender: sender,
-        destination: destination,
-        input_data: c.memory.readPtr(memInPos),
-        input_size: memInLen.uint,
-        value: toEvmc(value),
-        flags: flags.uint32
-      )
-
-      var res = c.host.call(msg)
-      c.returnData = @(makeOpenArray(res.outputData, res.outputSize.int))
-
-      let actualOutputSize = min(memOutLen, c.returnData.len)
-      if actualOutputSize > 0:
-        c.memory.write(memOutPos,
-          c.returnData.toOpenArray(0, actualOutputSize - 1))
-
-      c.gasMeter.returnGas(res.gas_left)
-
-      if res.status_code == EVMC_SUCCESS:
-        c.stack.top(1)
-
-      # TODO: a good candidate for destructor
-      if not res.release.isNil:
-        res.release(res)
-    else:
       let msg = Message(
         kind: callKind,
         depth: c.msg.depth + 1,
@@ -1058,7 +983,5 @@ op sstoreEIP2929, inline = false, slot, newValue:
       db.accessList(c.msg.contractAddress, slot)
       c.gasMeter.consumeGas(ColdSloadCost, reason = "sstoreEIP2929")
 
-  when evmc_enabled:
+  block:
-    sstoreEvmc(c, slot, newValue)
-  else:
     sstoreNetGasMeteringImpl(c, slot, newValue)

nimbus/vm2/interpreter/utils/macros_procs_opcodes.nim

@@ -14,9 +14,6 @@ import
   ../../types, ../../../errors, ../gas_meter, ../opcode_values,
   ./utils_numeric
 
-when defined(evmc_enabled):
-  import ../../evmc_api, evmc/evmc
-
 proc pop(tree: var NimNode): NimNode =
   ## Returns the last value of a NimNode and remove it
   result = tree[tree.len-1]
@@ -122,15 +119,7 @@ proc logImpl(c: Computation, opcode: Op, topicCount: int) =
     reason="Memory expansion, Log topic and data gas cost")
   c.memory.extend(memPos, len)
 
-  when evmc_enabled:
+  block:
-    var topics: array[4, evmc_bytes32]
-    for i in 0 ..< topicCount:
-      topics[i].bytes = c.stack.popTopic()
-
-    c.host.emitLog(c.msg.contractAddress,
-      c.memory.read(memPos, len),
-      topics[0].addr, topicCount)
-  else:
     var log: Log
     log.topics = newSeqOfCap[Topic](topicCount)
     for i in 0 ..< topicCount:

nimbus/vm2/memory.nim

@@ -47,11 +47,6 @@ proc read*(memory: var Memory, startPos: Natural, size: Natural): seq[byte] =
   # TODO: use an openarray[byte]
   result = memory.bytes[startPos ..< (startPos + size)]
 
-when defined(evmc_enabled):
-  proc readPtr*(memory: var Memory, startPos: Natural): ptr byte =
-    if memory.bytes.len == 0 or startPos >= memory.bytes.len: return
-    result = memory.bytes[startPos].addr
-
 proc write*(memory: var Memory, startPos: Natural, value: openarray[byte]) =
   let size = value.len
   if size == 0:

nimbus/vm2/types.nim

@@ -21,10 +21,6 @@ import
   # TODO - will be hidden at a lower layer
   ../db/[db_chain, accounts_cache]
 
-when defined(evmc_enabled):
-  import
-    ./evmc_api
-
 type
   VMFlag* = enum
     ExecutionOK
@@ -73,8 +69,6 @@ type
   Computation* = ref object
     # The execution computation
     vmState*:               BaseVMState
-    when defined(evmc_enabled):
-      host*:                HostContext
     msg*:                   Message
     memory*:                Memory
     stack*:                 Stack