nimbus-eth1/nimbus/vm/evmc_api.nim

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# 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
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proc nim_host_get_interface*(): ptr evmc_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.}
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type
HostContext* = object
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host*: ptr evmc_host_interface
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context*: evmc_host_context
proc init*(x: var HostContext, host: ptr evmc_host_interface, context: evmc_host_context) =
x.host = host
x.context = context
proc init*(x: typedesc[HostContext], host: ptr evmc_host_interface, context: evmc_host_context): HostContext =
result.init(host, context)
proc getTxContext*(ctx: HostContext): evmc_tx_context =
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{.gcsafe.}:
ctx.host.get_tx_context(ctx.context)
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proc getBlockHash*(ctx: HostContext, number: int64): Hash256 =
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{.gcsafe.}:
Hash256.fromEvmc ctx.host.get_block_hash(ctx.context, number)
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proc accountExists*(ctx: HostContext, address: EthAddress): bool =
var address = toEvmc(address)
ctx.host.account_exists(ctx.context, address.addr).bool
proc getStorage*(ctx: HostContext, address: EthAddress, key: Uint256): Uint256 =
var
address = toEvmc(address)
key = toEvmc(key)
Uint256.fromEvmc ctx.host.get_storage(ctx.context, address.addr, key.addr)
proc setStorage*(ctx: HostContext, address: EthAddress,
key, value: Uint256): evmc_storage_status =
var
address = toEvmc(address)
key = toEvmc(key)
value = toEvmc(value)
ctx.host.set_storage(ctx.context, address.addr, key.addr, value.addr)
proc getBalance*(ctx: HostContext, address: EthAddress): Uint256 =
var address = toEvmc(address)
Uint256.fromEvmc ctx.host.get_balance(ctx.context, address.addr)
proc getCodeSize*(ctx: HostContext, address: EthAddress): int =
var address = toEvmc(address)
ctx.host.get_code_size(ctx.context, address.addr).int
proc getCodeHash*(ctx: HostContext, address: EthAddress): Hash256 =
var address = toEvmc(address)
Hash256.fromEvmc ctx.host.get_code_hash(ctx.context, address.addr)
proc copyCode*(ctx: HostContext, address: EthAddress, codeOffset: int = 0): seq[byte] =
let size = ctx.getCodeSize(address)
var address = toEvmc(address)
if size - codeOffset > 0:
result = newSeq[byte](size - codeOffset)
let read = ctx.host.copy_code(ctx.context, address.addr, code_offset.uint, result[0].addr, result.len.uint).int
doAssert(read == result.len)
proc selfdestruct*(ctx: HostContext, address, beneficiary: EthAddress) =
var
address = toEvmc(address)
beneficiary = toEvmc(beneficiary)
ctx.host.selfdestruct(ctx.context, address.addr, beneficiary.addr)
proc emitLog*(ctx: HostContext, address: EthAddress, data: openArray[byte], topics: openArray[evmc_bytes32]) =
var address = toEvmc(address)
ctx.host.emit_log(ctx.context, address.addr, data[0].unsafeAddr, data.len.uint, topics[0].unsafeAddr, topics.len.uint)
proc call*(ctx: HostContext, msg: evmc_message): evmc_result =
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)