nimbus-eth1/nimbus/vm2/interpreter/op_handlers/oph_dup.nim

64 lines
1.9 KiB
Nim

# 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: Duplication Operations
## ===========================================
##
import
../../stack,
../op_codes,
./oph_defs,
./oph_gen_handlers,
sequtils,
stint,
strformat
# ------------------------------------------------------------------------------
# Private helpers
# ------------------------------------------------------------------------------
proc fnName(n: int): string {.compileTime.} =
&"dup{n}Op"
proc opName(n: int): string {.compileTime.} =
&"Dup{n}"
proc fnInfo(n: int): string {.compileTime.} =
var blurb = case n
of 1: "first"
of 2: "second"
of 3: "third"
else: &"{n}th"
&"Duplicate {blurb} item in the stack"
proc dupImpl(k: var Vm2Ctx; n: int) =
k.cpt.stack.dup(n)
const
inxRange = toSeq(1 .. 16)
# ------------------------------------------------------------------------------
# Private, op handlers implementation
# ------------------------------------------------------------------------------
genOphHandlers fnName, fnInfo, inxRange, dupImpl
# ------------------------------------------------------------------------------
# Public, op exec table entries
# ------------------------------------------------------------------------------
genOphList fnName, fnInfo, inxRange, "vm2OpExecDup", opName
# ------------------------------------------------------------------------------
# End
# ------------------------------------------------------------------------------