115 lines
3.2 KiB
Nim
115 lines
3.2 KiB
Nim
# Nimbus
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# Copyright (c) 2018-2024 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except
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# according to those terms.
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## EVM Opcode Handlers: Logging Operations
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## =======================================
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##
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{.push raises: [].}
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import
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stew/assign2,
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../../../constants,
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../../evm_errors,
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../../computation,
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../../memory,
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../../stack,
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../../types,
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../gas_costs,
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../op_codes,
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./oph_defs,
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./oph_gen_handlers,
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./oph_helpers,
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eth/common,
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sequtils,
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stint
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# ------------------------------------------------------------------------------
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# Private, names & settings
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# ------------------------------------------------------------------------------
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proc fnName(n: int): string {.compileTime.} =
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"log" & $n & "Op"
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proc opName(n: int): string {.compileTime.} =
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"Log" & $n
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proc fnInfo(n: int): string {.compileTime.} =
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var blurb = case n
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of 1: "topic"
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else: "topics"
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"Append log record with " & $n & " " & blurb
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proc logImpl(c: Computation, opcode: Op, topicCount: static int): EvmResultVoid =
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static: doAssert(topicCount in 0 .. 4)
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? checkInStaticContext(c)
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const stackSize = 2 + topicCount
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? c.stack.lsCheck(stackSize)
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let
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memPos = c.stack.lsPeekMemRef(^1)
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len = c.stack.lsPeekMemRef(^2)
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if memPos < 0 or len < 0:
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return err(opErr(OutOfBounds))
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? c.opcodeGasCost(opcode,
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c.gasCosts[opcode].m_handler(c.memory.len, memPos, len),
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reason = "Memory expansion, Log topic and data gas cost")
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c.memory.extend(memPos, len)
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when evmc_enabled:
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var topics: array[4, evmc_bytes32]
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for i in 0 ..< topicCount:
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topics[i].bytes = c.stack.lsPeekTopic(^(i+3))
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c.host.emitLog(c.msg.contractAddress,
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c.memory.read(memPos, len),
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topics[0].addr, topicCount)
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else:
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var log: Log
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log.topics = newSeqOfCap[Topic](topicCount)
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for i in 0 ..< topicCount:
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log.topics.add c.stack.lsPeekTopic(^(i+3))
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assign(log.data, c.memory.read(memPos, len))
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log.address = c.msg.contractAddress
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c.addLogEntry(log)
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c.stack.lsShrink(stackSize)
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ok()
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const
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inxRange = toSeq(0 .. 4)
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logOpArg = block:
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var rc: array[inxRange.len + 1, Op]
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for n in inxRange:
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rc[n] = Op(Log0.int + n)
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rc
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# ------------------------------------------------------------------------------
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# Private, op handlers implementation
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# ------------------------------------------------------------------------------
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proc wrapperFn(cpt: VmCpt; n: static int): EvmResultVoid =
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cpt.logImpl(logOpArg[n], n)
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genOphHandlers fnName, fnInfo, inxRange, wrapperFn
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# ------------------------------------------------------------------------------
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# Public, op exec table entries
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# ------------------------------------------------------------------------------
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genOphList fnName, fnInfo, inxRange, "VmOpExecLog", opName
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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