nimbus-eth1/nimbus/evm/interpreter/op_handlers/oph_log.nim

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# Nimbus
# Copyright (c) 2018 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.
## EVM Opcode Handlers: Logging Operations
## =======================================
##
import
../../../constants,
../../../errors,
../../computation,
../../memory,
../../stack,
../../types,
../gas_costs,
../gas_meter,
../op_codes,
../utils/utils_numeric,
./oph_defs,
./oph_gen_handlers,
./oph_helpers,
eth/common,
sequtils,
stint,
strformat
{.push raises: [CatchableError].} # basically the annotation type of a `Vm2OpFn`
# ------------------------------------------------------------------------------
# Private, names & settings
# ------------------------------------------------------------------------------
proc fnName(n: int): string {.compileTime.} =
&"log{n}Op"
proc opName(n: int): string {.compileTime.} =
&"Log{n}"
proc fnInfo(n: int): string {.compileTime.} =
var blurb = case n
of 1: "topic"
else: "topics"
&"Append log record with {n} {blurb}"
proc logImpl(c: Computation, opcode: Op, topicCount: int) =
doAssert(topicCount in 0 .. 4)
checkInStaticContext(c)
let (memStartPosition, size) = c.stack.popInt(2)
let (memPos, len) = (memStartPosition.cleanMemRef, size.cleanMemRef)
if memPos < 0 or len < 0:
raise newException(OutOfBoundsRead, "Out of bounds memory access")
c.gasMeter.consumeGas(
c.gasCosts[opcode].m_handler(c.memory.len, memPos, len),
reason = "Memory expansion, Log topic and data gas cost")
c.memory.extend(memPos, len)
when evmc_enabled:
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:
log.topics.add(c.stack.popTopic())
log.data = c.memory.read(memPos, len)
log.address = c.msg.contractAddress
c.addLogEntry(log)
const
inxRange = toSeq(0 .. 4)
logOpArg = block:
var rc: array[inxRange.len + 1, Op]
for n in inxRange:
rc[n] = Op(Log0.int + n)
rc
# ------------------------------------------------------------------------------
# Private, op handlers implementation
# ------------------------------------------------------------------------------
proc wrapperFn(k: var Vm2Ctx; n: int) =
logImpl(k.cpt, logOpArg[n], n)
genOphHandlers fnName, fnInfo, inxRange, wrapperFn
# ------------------------------------------------------------------------------
# Public, op exec table entries
# ------------------------------------------------------------------------------
genOphList fnName, fnInfo, inxRange, "vm2OpExecLog", opName
# ------------------------------------------------------------------------------
# End
# ------------------------------------------------------------------------------