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, ../constants
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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.
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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.}
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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.}
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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
host*: ptr nimbus_host_interface
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context*: evmc_host_context
proc init*(x: var HostContext, host: ptr nimbus_host_interface, context: evmc_host_context) =
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x.host = host
x.context = context
proc init*(x: typedesc[HostContext], host: ptr nimbus_host_interface, context: evmc_host_context): HostContext =
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result.init(host, context)
proc getTxContext*(ctx: HostContext): nimbus_tx_context {.inline.} =
ctx.host.get_tx_context(ctx.context)
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proc getBlockHash*(ctx: HostContext, number: Uint256): Hash256 =
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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))
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proc accountExists*(ctx: HostContext, address: EthAddress): bool {.inline.} =
ctx.host.account_exists(ctx.context, address)
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proc getStorage*(ctx: HostContext, address: EthAddress, key: Uint256): Uint256 =
var key = toEvmc(key)
Uint256.fromEvmc ctx.host.get_storage(ctx.context, address, key.addr)
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proc setStorage*(ctx: HostContext, address: EthAddress,
key, value: Uint256): evmc_storage_status {.inline.} =
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var
key = toEvmc(key)
value = toEvmc(value)
ctx.host.set_storage(ctx.context, address, key.addr, value.addr)
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proc getBalance*(ctx: HostContext, address: EthAddress): Uint256 {.inline.} =
Uint256.fromEvmc ctx.host.get_balance(ctx.context, address)
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proc getCodeSize*(ctx: HostContext, address: EthAddress): uint {.inline.} =
ctx.host.get_code_size(ctx.context, address)
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proc getCodeHash*(ctx: HostContext, address: EthAddress): Hash256 {.inline.} =
ctx.host.get_code_hash(ctx.context, address)
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proc copyCode*(ctx: HostContext, address: EthAddress, codeOffset: int = 0): seq[byte] =
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let size = ctx.getCodeSize(address).int
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if size - codeOffset > 0:
result = newSeq[byte](size - codeOffset)
let read = ctx.host.copy_code(ctx.context, address,
codeOffset, result[0].addr, result.len)
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doAssert(read == result.len)
proc selfdestruct*(ctx: HostContext, address, beneficiary: EthAddress) {.inline.} =
ctx.host.selfdestruct(ctx.context, address, beneficiary)
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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)
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proc call*(ctx: HostContext, msg: nimbus_message): nimbus_result {.inline.} =
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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)