164 lines
5.1 KiB
Nim
164 lines
5.1 KiB
Nim
# Nimbus
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# Copyright (c) 2018 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: Helper Functions & Macros
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## ==============================================
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##
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# Including types.nim and others unless included (not imported) into
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# oph_kludge.nim
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#
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when not declared(Computation):
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import
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../../../db/accounts_cache,
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../../state,
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../../types,
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../gas_costs,
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../gas_meter,
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./oph_defs,
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eth/common
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import
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../../../errors,
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eth/common/eth_types,
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macros,
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stint,
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strutils
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type
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OphNumToTextFn* = proc(n: int): string
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OpHanldlerImplFn* = proc(k: var Vm2Ctx; n: int)
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const
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recForkSet = "Vm2OpAllForks"
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# ------------------------------------------------------------------------------
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# Private helpers
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# ------------------------------------------------------------------------------
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proc asIdent(id, name: string): NimNode {.compileTime.} =
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result = nnkExprColonExpr.newTree(
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newIdentNode(id),
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newIdentNode(name))
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proc asText(id, name: string): NimNode {.compileTime.} =
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result = nnkExprColonExpr.newTree(
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newIdentNode(id),
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newLit(name))
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# ------------------------------------------------------------------------------
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# Public
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# ------------------------------------------------------------------------------
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proc gasEip2929AccountCheck*(c: Computation;
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address: EthAddress, prevCost = 0.GasInt) =
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c.vmState.mutateStateDB:
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let gasCost = if not db.inAccessList(address):
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db.accessList(address)
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ColdAccountAccessCost
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else:
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WarmStorageReadCost
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c.gasMeter.consumeGas(
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gasCost - prevCost,
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reason = "gasEIP2929AccountCheck")
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template checkInStaticContext*(c: Computation) =
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## Verify static context in handler function, raise an error otherwise
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if emvcStatic == c.msg.flags:
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# TODO: if possible, this check only appear
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# when fork >= FkByzantium
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raise newException(
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StaticContextError,
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"Cannot modify state while inside of STATICCALL context")
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macro genOphHandlers*(runHandler: static[OphNumToTextFn];
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itemInfo: static[OphNumToTextFn];
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inxList: static[openArray[int]];
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body: static[OpHanldlerImplFn]): untyped =
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## Generate the equivalent of
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## ::
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## const <runHandler>: Vm2OpFn = proc (k: var Vm2Ctx) =
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## ## <itemInfo(n)>,
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## <body(k,n)>
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##
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## for all `n` in `inxList`
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##
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result = newStmtList()
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for n in inxList:
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let
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fnName = ident(n.runHandler)
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comment = newCommentStmtNode(n.itemInfo)
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# => push##Op: Vm2OpFn = proc (k: var Vm2Ctx) = ...
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result.add quote do:
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const `fnName`: Vm2OpFn = proc(k: var Vm2Ctx) =
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`comment`
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`body`(k,`n`)
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# echo ">>>", result.repr
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macro genOphList*(runHandler: static[OphNumToTextFn];
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handlerInfo: static[OphNumToTextFn];
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inxList: static[openArray[int]];
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varName: static[string];
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opCode: static[OphNumToTextFn]): untyped =
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## Generate
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## ::
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## const <varName>*: seq[Vm2OpExec] = @[ <records> ]
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##
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## where <records> is a sequence of <record(n)> items like
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## ::
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## (opCode: <opCode(n)>,
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## forks: Vm2OpAllForks,
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## info: <handlerInfo(n)>,
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## exec: (prep: vm2OpIgnore,
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## run: <runHandler(n)>,
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## post: vm2OpIgnore))
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##
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## for all `n` in `inxList`
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##
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var records = nnkBracket.newTree()
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for n in inxList:
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var handlerName = n.runHandler.multiReplace(("Op",""),("OP",""))
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records.add nnkPar.newTree(
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"opCode".asIdent(n.opCode),
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"forks".asIdent(recForkSet),
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"name".asText(handlerName),
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"info".asText(n.handlerInfo),
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nnkExprColonExpr.newTree(
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newIdentNode("exec"),
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nnkPar.newTree(
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"prep".asIdent("vm2OpIgnore"),
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"run".asIdent(n.runHandler),
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"post".asIdent("vm2OpIgnore"))))
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# => const <varName>*: seq[Vm2OpExec] = @[ <records> ]
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result = nnkStmtList.newTree(
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nnkConstSection.newTree(
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nnkConstDef.newTree(
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nnkPostfix.newTree(
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newIdentNode("*"),
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newIdentNode(varName)),
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nnkBracketExpr.newTree(
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newIdentNode("seq"),
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newIdentNode("Vm2OpExec")),
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nnkPrefix.newTree(
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newIdentNode("@"), records))))
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# echo ">>> ", result.repr
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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