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nimbus-eth1/nimbus/vm/interpreter_dispatch.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.
import
tables, macros,
chronicles,
./interpreter/[opcode_values, opcodes_impl, vm_forks, gas_costs, gas_meter, utils/macros_gen_opcodes],
./code_stream,
../vm_types, ../errors, precompiles,
./stack, terminal # Those are only needed for logging
logScope:
topics = "vm opcode"
func invalidInstruction*(computation: var BaseComputation) {.inline.} =
raise newException(InvalidInstruction, "Invalid instruction, received an opcode not implemented in the current fork.")
let FrontierOpDispatch {.compileTime.}: array[Op, NimNode] = block:
fill_enum_table_holes(Op, newIdentNode("invalidInstruction")):
[
Stop: newIdentNode "toBeReplacedByBreak",
Add: newIdentNode "add",
Mul: newIdentNode "mul",
Sub: newIdentNode "sub",
Div: newIdentNode "divide",
Sdiv: newIdentNode "sdiv",
Mod: newIdentNode "modulo",
Smod: newIdentNode "smod",
Addmod: newIdentNode "addmod",
Mulmod: newIdentNode "mulmod",
Exp: newIdentNode "exp",
SignExtend: newIdentNode "signExtend",
# 10s: Comparison & Bitwise Logic Operations
Lt: newIdentNode "lt",
Gt: newIdentNode "gt",
Slt: newIdentNode "slt",
Sgt: newIdentNode "sgt",
Eq: newIdentNode "eq",
IsZero: newIdentNode "isZero",
And: newIdentNode "andOp",
Or: newIdentNode "orOp",
Xor: newIdentNode "xorOp",
Not: newIdentNode "notOp",
Byte: newIdentNode "byteOp",
# 20s: SHA3
Sha3: newIdentNode "sha3",
# 30s: Environmental Information
Address: newIdentNode "address",
Balance: newIdentNode "balance",
Origin: newIdentNode "origin",
Caller: newIdentNode "caller",
CallValue: newIdentNode "callValue",
CallDataLoad: newIdentNode "callDataLoad",
CallDataSize: newIdentNode "callDataSize",
CallDataCopy: newIdentNode "callDataCopy",
CodeSize: newIdentNode "codeSize",
CodeCopy: newIdentNode "codeCopy",
GasPrice: newIdentNode "gasPrice",
ExtCodeSize: newIdentNode "extCodeSize",
ExtCodeCopy: newIdentNode "extCodeCopy",
# ReturnDataSize: introduced in Byzantium
# ReturnDataCopy: introduced in Byzantium
# 40s: Block Information
Blockhash: newIdentNode "blockhash",
Coinbase: newIdentNode "coinbase",
Timestamp: newIdentNode "timestamp",
Number: newIdentNode "blockNumber",
Difficulty: newIdentNode "difficulty",
GasLimit: newIdentNode "gasLimit",
# 50s: Stack, Memory, Storage and Flow Operations
Pop: newIdentNode "pop",
Mload: newIdentNode "mload",
Mstore: newIdentNode "mstore",
Mstore8: newIdentNode "mstore8",
Sload: newIdentNode "sload",
Sstore: newIdentNode "sstore",
Jump: newIdentNode "jump",
JumpI: newIdentNode "jumpI",
Pc: newIdentNode "pc",
Msize: newIdentNode "msize",
Gas: newIdentNode "gas",
JumpDest: newIdentNode "jumpDest",
# 60s & 70s: Push Operations.
Push1: newIdentNode "push1",
Push2: newIdentNode "push2",
Push3: newIdentNode "push3",
Push4: newIdentNode "push4",
Push5: newIdentNode "push5",
Push6: newIdentNode "push6",
Push7: newIdentNode "push7",
Push8: newIdentNode "push8",
Push9: newIdentNode "push9",
Push10: newIdentNode "push10",
Push11: newIdentNode "push11",
Push12: newIdentNode "push12",
Push13: newIdentNode "push13",
Push14: newIdentNode "push14",
Push15: newIdentNode "push15",
Push16: newIdentNode "push16",
Push17: newIdentNode "push17",
Push18: newIdentNode "push18",
Push19: newIdentNode "push19",
Push20: newIdentNode "push20",
Push21: newIdentNode "push21",
Push22: newIdentNode "push22",
Push23: newIdentNode "push23",
Push24: newIdentNode "push24",
Push25: newIdentNode "push25",
Push26: newIdentNode "push26",
Push27: newIdentNode "push27",
Push28: newIdentNode "push28",
Push29: newIdentNode "push29",
Push30: newIdentNode "push30",
Push31: newIdentNode "push31",
Push32: newIdentNode "push32",
# 80s: Duplication Operations
Dup1: newIdentNode "dup1",
Dup2: newIdentNode "dup2",
Dup3: newIdentNode "dup3",
Dup4: newIdentNode "dup4",
Dup5: newIdentNode "dup5",
Dup6: newIdentNode "dup6",
Dup7: newIdentNode "dup7",
Dup8: newIdentNode "dup8",
Dup9: newIdentNode "dup9",
Dup10: newIdentNode "dup10",
Dup11: newIdentNode "dup11",
Dup12: newIdentNode "dup12",
Dup13: newIdentNode "dup13",
Dup14: newIdentNode "dup14",
Dup15: newIdentNode "dup15",
Dup16: newIdentNode "dup16",
# 90s: Exchange Operations
Swap1: newIdentNode "swap1",
Swap2: newIdentNode "swap2",
Swap3: newIdentNode "swap3",
Swap4: newIdentNode "swap4",
Swap5: newIdentNode "swap5",
Swap6: newIdentNode "swap6",
Swap7: newIdentNode "swap7",
Swap8: newIdentNode "swap8",
Swap9: newIdentNode "swap9",
Swap10: newIdentNode "swap10",
Swap11: newIdentNode "swap11",
Swap12: newIdentNode "swap12",
Swap13: newIdentNode "swap13",
Swap14: newIdentNode "swap14",
Swap15: newIdentNode "swap15",
Swap16: newIdentNode "swap16",
# a0s: Logging Operations
Log0: newIdentNode "log0",
Log1: newIdentNode "log1",
Log2: newIdentNode "log2",
Log3: newIdentNode "log3",
Log4: newIdentNode "log4",
# f0s: System operations
Create: newIdentNode "create",
Call: newIdentNode "call",
CallCode: newIdentNode "callCode",
Return: newIdentNode "returnOp",
# StaticCall: introduced in Byzantium
# Revert: introduced in Byzantium
# Invalid: newIdentNode "invalid",
SelfDestruct: newIdentNode "selfDestruct"
]
proc genHomesteadJumpTable(ops: array[Op, NimNode]): array[Op, NimNode] {.compileTime.} =
result = ops
result[DelegateCall] = newIdentNode "delegateCall"
let HomesteadOpDispatch {.compileTime.}: array[Op, NimNode] = genHomesteadJumpTable(FrontierOpDispatch)
proc opTableToCaseStmt(opTable: array[Op, NimNode], computation: NimNode): NimNode =
let instr = quote do: `computation`.instr
result = nnkCaseStmt.newTree(instr)
# Add a branch for each (opcode, proc) pair
# We dispatch to the next instruction at the end of each branch
for op, opImpl in opTable.pairs:
let asOp = quote do: Op(`op`) # TODO: unfortunately when passing to runtime, ops are transformed into int
let branchStmt = block:
if op == Stop:
quote do:
trace "op: Stop"
if not `computation`.code.atEnd() and `computation`.tracingEnabled:
# we only trace `REAL STOP` and ignore `FAKE STOP`
`computation`.opIndex = `computation`.traceOpCodeStarted(`asOp`)
`computation`.traceOpCodeEnded(`asOp`, `computation`.opIndex)
break
else:
if BaseGasCosts[op].kind == GckFixed:
quote do:
if `computation`.tracingEnabled:
`computation`.opIndex = `computation`.traceOpCodeStarted(`asOp`)
`computation`.gasMeter.consumeGas(`computation`.gasCosts[`asOp`].cost, reason = $`asOp`)
`opImpl`(`computation`)
if `computation`.tracingEnabled:
`computation`.traceOpCodeEnded(`asOp`, `computation`.opIndex)
`instr` = `computation`.code.next()
else:
quote do:
if `computation`.tracingEnabled:
`computation`.opIndex = `computation`.traceOpCodeStarted(`asOp`)
`opImpl`(`computation`)
if `computation`.tracingEnabled:
`computation`.traceOpCodeEnded(`asOp`, `computation`.opIndex)
when `asOp` in {Return, Revert, SelfDestruct}:
break
else:
`instr` = `computation`.code.next()
result.add nnkOfBranch.newTree(
newIdentNode($op),
branchStmt
)
# Wrap the case statement in while true + computed goto
result = quote do:
if `computation`.tracingEnabled:
`computation`.prepareTracer()
`computation`.instr = `computation`.code.next()
while true:
{.computedGoto.}
# TODO lots of macro magic here to unravel, with chronicles...
# `computation`.logger.log($`computation`.stack & "\n\n", fgGreen)
`result`
macro genFrontierDispatch(computation: BaseComputation): untyped =
result = opTableToCaseStmt(FrontierOpDispatch, computation)
macro genHomesteadDispatch(computation: BaseComputation): untyped =
result = opTableToCaseStmt(HomesteadOpDispatch, computation)
proc frontierVM(computation: var BaseComputation) =
if not computation.execPrecompiles:
genFrontierDispatch(computation)
proc homesteadVM(computation: var BaseComputation) =
if not computation.execPrecompiles:
genHomesteadDispatch(computation)
proc executeOpcodes(computation: var BaseComputation) =
# TODO: Optimise getting fork and updating opCodeExec only when necessary
let fork = computation.getFork
case fork
of FkFrontier..FkThawing:
computation.frontierVM()
of FkHomestead..FkSpurious:
computation.homesteadVM()
else:
raise newException(VMError, "Unknown or not implemented fork: " & $fork)
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