988 lines
31 KiB
Nim
988 lines
31 KiB
Nim
# Nimbus
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# Copyright (c) 2018-2019 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 http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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import
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strformat, times, sets, sequtils, options,
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chronicles, stint, nimcrypto, stew/ranges/ptr_arith, eth/common,
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./utils/[macros_procs_opcodes, v2utils_numeric],
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./gas_meter, ./v2gas_costs, ./v2opcode_values, ./v2forks,
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../v2memory, ../stack, ../code_stream, ../v2computation, ../v2state, ../v2types,
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../../errors, ../../constants,
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../../db/[db_chain, accounts_cache]
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logScope:
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topics = "opcode impl"
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# ##################################
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# Syntactic sugar
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proc gasEip2929AccountCheck(c: Computation, 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(gasCost - prevCost, reason = "gasEIP2929AccountCheck")
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template push(x: typed) {.dirty.} =
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## Push an expression on the computation stack
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c.stack.push x
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# ##################################
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# 0s: Stop and Arithmetic Operations
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op add, inline = true, lhs, rhs:
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## 0x01, Addition
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push: lhs + rhs
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op mul, inline = true, lhs, rhs:
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## 0x02, Multiplication
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push: lhs * rhs
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op sub, inline = true, lhs, rhs:
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## 0x03, Substraction
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push: lhs - rhs
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op divide, inline = true, lhs, rhs:
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## 0x04, Division
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push:
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if rhs == 0: zero(Uint256) # EVM special casing of div by 0
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else: lhs div rhs
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op sdiv, inline = true, lhs, rhs:
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## 0x05, Signed division
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var r: UInt256
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if rhs != 0:
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var a = lhs
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var b = rhs
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var signA, signB: bool
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extractSign(a, signA)
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extractSign(b, signB)
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r = a div b
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setSign(r, signA xor signB)
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push(r)
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op modulo, inline = true, lhs, rhs:
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## 0x06, Modulo
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push:
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if rhs == 0: zero(Uint256)
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else: lhs mod rhs
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op smod, inline = true, lhs, rhs:
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## 0x07, Signed modulo
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var r: UInt256
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if rhs != 0:
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var sign: bool
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var v = lhs
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var m = rhs
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extractSign(m, sign)
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extractSign(v, sign)
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r = v mod m
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setSign(r, sign)
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push(r)
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op addmod, inline = true, lhs, rhs, modulus:
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## 0x08, Modulo addition
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## Intermediate computations do not roll over at 2^256
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push:
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if modulus == 0: zero(UInt256) # EVM special casing of div by 0
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else: addmod(lhs, rhs, modulus)
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op mulmod, inline = true, lhs, rhs, modulus:
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## 0x09, Modulo multiplication
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## Intermediate computations do not roll over at 2^256
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push:
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if modulus == 0: zero(UInt256) # EVM special casing of div by 0
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else: mulmod(lhs, rhs, modulus)
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op exp, inline = true, base, exponent:
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## 0x0A, Exponentiation
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c.gasMeter.consumeGas(
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c.gasCosts[Exp].d_handler(exponent),
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reason="EXP: exponent bytes"
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)
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push:
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if base.isZero:
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if exponent.isZero:
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# https://github.com/ethereum/yellowpaper/issues/257
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# https://github.com/ethereum/tests/pull/460
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# https://github.com/ewasm/evm2wasm/issues/137
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1.u256
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else:
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zero(UInt256)
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else:
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base.pow(exponent)
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op signExtend, inline = false, bits, value:
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## 0x0B, Sign extend
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## Extend length of two’s complement signed integer.
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var res: UInt256
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if bits <= 31.u256:
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let
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one = 1.u256
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testBit = bits.truncate(int) * 8 + 7
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bitPos = one shl testBit
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mask = bitPos - one
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if not isZero(value and bitPos):
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res = value or (not mask)
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else:
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res = value and mask
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else:
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res = value
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push: res
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# ##########################################
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# 10s: Comparison & Bitwise Logic Operations
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op lt, inline = true, lhs, rhs:
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## 0x10, Less-than comparison
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push: (lhs < rhs).uint.u256
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op gt, inline = true, lhs, rhs:
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## 0x11, Greater-than comparison
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push: (lhs > rhs).uint.u256
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op slt, inline = true, lhs, rhs:
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## 0x12, Signed less-than comparison
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push: (cast[Int256](lhs) < cast[Int256](rhs)).uint.u256
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op sgt, inline = true, lhs, rhs:
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## 0x13, Signed greater-than comparison
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push: (cast[Int256](lhs) > cast[Int256](rhs)).uint.u256
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op eq, inline = true, lhs, rhs:
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## 0x14, Signed greater-than comparison
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push: (lhs == rhs).uint.u256
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op isZero, inline = true, value:
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## 0x15, Check if zero
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push: value.isZero.uint.u256
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op andOp, inline = true, lhs, rhs:
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## 0x16, Bitwise AND
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push: lhs and rhs
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op orOp, inline = true, lhs, rhs:
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## 0x17, Bitwise AND
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push: lhs or rhs
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op xorOp, inline = true, lhs, rhs:
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## 0x18, Bitwise AND
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push: lhs xor rhs
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op notOp, inline = true, value:
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## 0x19, Check if zero
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push: value.not
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op byteOp, inline = true, position, value:
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## 0x20, Retrieve single byte from word.
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let pos = position.truncate(int)
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push:
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if pos >= 32 or pos < 0: zero(Uint256)
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else:
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when system.cpuEndian == bigEndian:
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cast[array[32, byte]](value)[pos].u256
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else:
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cast[array[32, byte]](value)[31 - pos].u256
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# ##########################################
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# 20s: SHA3
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op sha3, inline = true, startPos, length:
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## 0x20, Compute Keccak-256 hash.
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let (pos, len) = (startPos.safeInt, length.safeInt)
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if pos < 0 or len < 0 or pos > 2147483648:
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raise newException(OutOfBoundsRead, "Out of bounds memory access")
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c.gasMeter.consumeGas(
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c.gasCosts[Op.Sha3].m_handler(c.memory.len, pos, len),
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reason="SHA3: word gas cost"
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)
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c.memory.extend(pos, len)
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let endRange = min(pos + len, c.memory.len) - 1
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if endRange == -1 or pos >= c.memory.len:
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push(EMPTY_SHA3)
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else:
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push:
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keccak256.digest c.memory.bytes.toOpenArray(pos, endRange)
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# ##########################################
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# 30s: Environmental Information
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proc writePaddedResult(mem: var Memory,
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data: openarray[byte],
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memPos, dataPos, len: Natural,
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paddingValue = 0.byte) =
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mem.extend(memPos, len)
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let dataEndPosition = dataPos.int64 + len - 1
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let sourceBytes = data[min(dataPos, data.len) .. min(data.len - 1, dataEndPosition)]
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mem.write(memPos, sourceBytes)
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# Don't duplicate zero-padding of mem.extend
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let paddingOffset = min(memPos + sourceBytes.len, mem.len)
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let numPaddingBytes = min(mem.len - paddingOffset, len - sourceBytes.len)
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if numPaddingBytes > 0:
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# TODO: avoid unnecessary memory allocation
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mem.write(paddingOffset, repeat(paddingValue, numPaddingBytes))
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op address, inline = true:
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## 0x30, Get address of currently executing account.
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push: c.msg.contractAddress
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op balance, inline = true:
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## 0x31, Get balance of the given account.
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let address = c.stack.popAddress()
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push: c.getBalance(address)
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op origin, inline = true:
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## 0x32, Get execution origination address.
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push: c.getOrigin()
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op caller, inline = true:
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## 0x33, Get caller address.
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push: c.msg.sender
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op callValue, inline = true:
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## 0x34, Get deposited value by the instruction/transaction
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## responsible for this execution
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push: c.msg.value
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op callDataLoad, inline = false, startPos:
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## 0x35, Get input data of current environment
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let start = startPos.cleanMemRef
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if start >= c.msg.data.len:
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push: 0
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return
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# If the data does not take 32 bytes, pad with zeros
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let endRange = min(c.msg.data.len - 1, start + 31)
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let presentBytes = endRange - start
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# We rely on value being initialized with 0 by default
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var value: array[32, byte]
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value[0 .. presentBytes] = c.msg.data.toOpenArray(start, endRange)
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push: value
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op callDataSize, inline = true:
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## 0x36, Get size of input data in current environment.
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push: c.msg.data.len.u256
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op callDataCopy, inline = false, memStartPos, copyStartPos, size:
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## 0x37, Copy input data in current environment to memory.
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# TODO tests: https://github.com/status-im/nimbus/issues/67
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let (memPos, copyPos, len) = (memStartPos.cleanMemRef, copyStartPos.cleanMemRef, size.cleanMemRef)
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c.gasMeter.consumeGas(
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c.gasCosts[CallDataCopy].m_handler(c.memory.len, memPos, len),
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reason="CallDataCopy fee")
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c.memory.writePaddedResult(c.msg.data, memPos, copyPos, len)
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op codeSize, inline = true:
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## 0x38, Get size of code running in current environment.
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push: c.code.len
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op codeCopy, inline = false, memStartPos, copyStartPos, size:
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## 0x39, Copy code running in current environment to memory.
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# TODO tests: https://github.com/status-im/nimbus/issues/67
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let (memPos, copyPos, len) = (memStartPos.cleanMemRef, copyStartPos.cleanMemRef, size.cleanMemRef)
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c.gasMeter.consumeGas(
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c.gasCosts[CodeCopy].m_handler(c.memory.len, memPos, len),
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reason="CodeCopy fee")
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c.memory.writePaddedResult(c.code.bytes, memPos, copyPos, len)
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op gasprice, inline = true:
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## 0x3A, Get price of gas in current environment.
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push: c.getGasPrice()
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op extCodeSize, inline = true:
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## 0x3b, Get size of an account's code
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let address = c.stack.popAddress()
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push: c.getCodeSize(address)
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op extCodeCopy, inline = true:
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## 0x3c, Copy an account's code to memory.
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let address = c.stack.popAddress()
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let (memStartPos, codeStartPos, size) = c.stack.popInt(3)
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let (memPos, codePos, len) = (memStartPos.cleanMemRef, codeStartPos.cleanMemRef, size.cleanMemRef)
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c.gasMeter.consumeGas(
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c.gasCosts[ExtCodeCopy].m_handler(c.memory.len, memPos, len),
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reason="ExtCodeCopy fee")
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let codeBytes = c.getCode(address)
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c.memory.writePaddedResult(codeBytes, memPos, codePos, len)
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op returnDataSize, inline = true:
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## 0x3d, Get size of output data from the previous call from the current environment.
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push: c.returnData.len
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op returnDataCopy, inline = false, memStartPos, copyStartPos, size:
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## 0x3e, Copy output data from the previous call to memory.
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let (memPos, copyPos, len) = (memStartPos.cleanMemRef, copyStartPos.cleanMemRef, size.cleanMemRef)
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let gasCost = c.gasCosts[ReturnDataCopy].m_handler(c.memory.len, memPos, len)
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c.gasMeter.consumeGas(
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gasCost,
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reason="returnDataCopy fee")
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if copyPos + len > c.returnData.len:
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# TODO Geth additionally checks copyPos + len < 64
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# Parity uses a saturating addition
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# Yellow paper mentions μs[1] + i are not subject to the 2^256 modulo.
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raise newException(OutOfBoundsRead,
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"Return data length is not sufficient to satisfy request. Asked \n" &
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&"for data from index {copyStartPos} to {copyStartPos + size}. Return data is {c.returnData.len} in \n" &
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"length")
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c.memory.writePaddedResult(c.returnData, memPos, copyPos, len)
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# ##########################################
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# 40s: Block Information
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op blockhash, inline = true, blockNumber:
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## 0x40, Get the hash of one of the 256 most recent complete blocks.
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push: c.getBlockHash(blockNumber)
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op coinbase, inline = true:
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## 0x41, Get the block's beneficiary address.
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push: c.getCoinbase()
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op timestamp, inline = true:
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## 0x42, Get the block's timestamp.
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push: c.getTimestamp()
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op blocknumber, inline = true:
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## 0x43, Get the block's number.
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push: c.getBlockNumber()
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op difficulty, inline = true:
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## 0x44, Get the block's difficulty
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push: c.getDifficulty()
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op gasLimit, inline = true:
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## 0x45, Get the block's gas limit
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push: c.getGasLimit()
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op chainId, inline = true:
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## 0x46, Get current chain’s EIP-155 unique identifier.
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push: c.getChainId()
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op selfBalance, inline = true:
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## 0x47, Get current contract's balance.
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push: c.getBalance(c.msg.contractAddress)
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# ##########################################
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# 50s: Stack, Memory, Storage and Flow Operations
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op pop, inline = true:
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## 0x50, Remove item from stack.
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discard c.stack.popInt()
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op mload, inline = true, memStartPos:
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## 0x51, Load word from memory
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let memPos = memStartPos.cleanMemRef
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c.gasMeter.consumeGas(
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c.gasCosts[MLoad].m_handler(c.memory.len, memPos, 32),
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reason="MLOAD: GasVeryLow + memory expansion"
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)
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c.memory.extend(memPos, 32)
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push: c.memory.read(memPos, 32) # TODO, should we convert to native endianness?
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op mstore, inline = true, memStartPos, value:
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## 0x52, Save word to memory
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let memPos = memStartPos.cleanMemRef
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c.gasMeter.consumeGas(
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c.gasCosts[MStore].m_handler(c.memory.len, memPos, 32),
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reason="MSTORE: GasVeryLow + memory expansion"
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)
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c.memory.extend(memPos, 32)
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c.memory.write(memPos, value.toByteArrayBE) # is big-endian correct? Parity/Geth do convert
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op mstore8, inline = true, memStartPos, value:
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## 0x53, Save byte to memory
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let memPos = memStartPos.cleanMemRef
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c.gasMeter.consumeGas(
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c.gasCosts[MStore].m_handler(c.memory.len, memPos, 1),
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reason="MSTORE8: GasVeryLow + memory expansion"
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)
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c.memory.extend(memPos, 1)
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c.memory.write(memPos, [value.toByteArrayBE[31]])
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op sload, inline = true, slot:
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## 0x54, Load word from storage.
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push: c.getStorage(slot)
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template sstoreImpl(c: Computation, slot, newValue: Uint256) =
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let currentValue {.inject.} = c.getStorage(slot)
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let
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gasParam = GasParams(kind: Op.Sstore, s_currentValue: currentValue)
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(gasCost, gasRefund) = c.gasCosts[Sstore].c_handler(newValue, gasParam)
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c.gasMeter.consumeGas(gasCost, &"SSTORE: {c.msg.contractAddress}[{slot}] -> {newValue} ({currentValue})")
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if gasRefund > 0:
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c.gasMeter.refundGas(gasRefund)
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c.vmState.mutateStateDB:
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db.setStorage(c.msg.contractAddress, slot, newValue)
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op sstore, inline = false, slot, newValue:
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## 0x55, Save word to storage.
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checkInStaticContext(c)
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block:
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sstoreImpl(c, slot, newValue)
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template sstoreNetGasMeteringImpl(c: Computation, slot, newValue: Uint256) =
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let stateDB = c.vmState.readOnlyStateDB
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let currentValue {.inject.} = c.getStorage(slot)
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let
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gasParam = GasParams(kind: Op.Sstore,
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s_currentValue: currentValue,
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s_originalValue: stateDB.getCommittedStorage(c.msg.contractAddress, slot)
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)
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(gasCost, gasRefund) = c.gasCosts[Sstore].c_handler(newValue, gasParam)
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c.gasMeter.consumeGas(gasCost, &"SSTORE EIP2200: {c.msg.contractAddress}[{slot}] -> {newValue} ({currentValue})")
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if gasRefund != 0:
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c.gasMeter.refundGas(gasRefund)
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c.vmState.mutateStateDB:
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db.setStorage(c.msg.contractAddress, slot, newValue)
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op sstoreEIP2200, inline = false, slot, newValue:
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checkInStaticContext(c)
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const SentryGasEIP2200 = 2300 # Minimum gas required to be present for an SSTORE call, not consumed
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if c.gasMeter.gasRemaining <= SentryGasEIP2200:
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raise newException(OutOfGas, "Gas not enough to perform EIP2200 SSTORE")
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block:
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sstoreNetGasMeteringImpl(c, slot, newValue)
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op sstoreEIP1283, inline = false, slot, newValue:
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checkInStaticContext(c)
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block:
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sstoreNetGasMeteringImpl(c, slot, newValue)
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proc jumpImpl(c: Computation, jumpTarget: UInt256) =
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if jumpTarget >= c.code.len.u256:
|
||
raise newException(InvalidJumpDestination, "Invalid Jump Destination")
|
||
|
||
let jt = jumpTarget.truncate(int)
|
||
c.code.pc = jt
|
||
|
||
let nextOpcode = c.code.peek
|
||
if nextOpcode != JUMPDEST:
|
||
raise newException(InvalidJumpDestination, "Invalid Jump Destination")
|
||
# TODO: next check seems redundant
|
||
if not c.code.isValidOpcode(jt):
|
||
raise newException(InvalidInstruction, "Jump resulted in invalid instruction")
|
||
|
||
op jump, inline = true, jumpTarget:
|
||
## 0x56, Alter the program counter
|
||
jumpImpl(c, jumpTarget)
|
||
|
||
op jumpI, inline = true, jumpTarget, testedValue:
|
||
## 0x57, Conditionally alter the program counter.
|
||
if testedValue != 0:
|
||
jumpImpl(c, jumpTarget)
|
||
|
||
op pc, inline = true:
|
||
## 0x58, Get the value of the program counter prior to the increment corresponding to this instruction.
|
||
push: max(c.code.pc - 1, 0)
|
||
|
||
op msize, inline = true:
|
||
## 0x59, Get the size of active memory in bytes.
|
||
push: c.memory.len
|
||
|
||
op gas, inline = true:
|
||
## 0x5a, Get the amount of available gas, including the corresponding reduction for the cost of this instruction.
|
||
push: c.gasMeter.gasRemaining
|
||
|
||
op jumpDest, inline = true:
|
||
## 0x5b, Mark a valid destination for jumps. This operation has no effect on machine state during execution.
|
||
discard
|
||
|
||
op beginSub, inline = true:
|
||
## 0x5c, Marks the entry point to a subroutine
|
||
raise newException(OutOfGas, "Abort: Attempt to execute BeginSub opcode")
|
||
|
||
op returnSub, inline = true:
|
||
## 0x5d, Returns control to the caller of a subroutine.
|
||
if c.returnStack.len == 0:
|
||
raise newException(OutOfGas, "Abort: invalid returnStack during ReturnSub")
|
||
# Other than the check that the return stack is not empty, there is no
|
||
# need to validate the pc from 'returns', since we only ever push valid
|
||
# values onto it via jumpsub.
|
||
c.code.pc = c.returnStack.pop()
|
||
|
||
op jumpSub, inline = true, jumpTarget:
|
||
## 0x5e, Transfers control to a subroutine.
|
||
if jumpTarget >= c.code.len.u256:
|
||
raise newException(InvalidJumpDestination, "JumpSub destination exceeds code len")
|
||
|
||
let returnPC = c.code.pc
|
||
let jt = jumpTarget.truncate(int)
|
||
c.code.pc = jt
|
||
|
||
let nextOpcode = c.code.peek
|
||
if nextOpcode != BeginSub:
|
||
raise newException(InvalidJumpDestination, "Invalid JumpSub destination")
|
||
|
||
if c.returnStack.len == 1023:
|
||
raise newException(FullStack, "Out of returnStack")
|
||
|
||
c.returnStack.add returnPC
|
||
inc c.code.pc
|
||
|
||
# ##########################################
|
||
# 60s & 70s: Push Operations.
|
||
# 80s: Duplication Operations
|
||
# 90s: Exchange Operations
|
||
# a0s: Logging Operations
|
||
|
||
genPush()
|
||
genDup()
|
||
genSwap()
|
||
genLog()
|
||
|
||
# ##########################################
|
||
# f0s: System operations.
|
||
template genCreate(callName: untyped, opCode: Op): untyped =
|
||
op callName, inline = false:
|
||
checkInStaticContext(c)
|
||
let
|
||
endowment = c.stack.popInt()
|
||
memPos = c.stack.popInt().safeInt
|
||
|
||
when opCode == Create:
|
||
const callKind = evmcCreate
|
||
let memLen {.inject.} = c.stack.peekInt().safeInt
|
||
let salt = 0.u256
|
||
else:
|
||
const callKind = evmcCreate2
|
||
let memLen {.inject.} = c.stack.popInt().safeInt
|
||
let salt = c.stack.peekInt()
|
||
|
||
c.stack.top(0)
|
||
|
||
let gasParams = GasParams(kind: Create,
|
||
cr_currentMemSize: c.memory.len,
|
||
cr_memOffset: memPos,
|
||
cr_memLength: memLen
|
||
)
|
||
var gasCost = c.gasCosts[Create].c_handler(1.u256, gasParams).gasCost
|
||
when opCode == Create2:
|
||
gasCost = gasCost + c.gasCosts[Create2].m_handler(0, 0, memLen)
|
||
|
||
let reason = &"CREATE: GasCreate + {memLen} * memory expansion"
|
||
c.gasMeter.consumeGas(gasCost, reason = reason)
|
||
c.memory.extend(memPos, memLen)
|
||
c.returnData.setLen(0)
|
||
|
||
if c.msg.depth >= MaxCallDepth:
|
||
debug "Computation Failure", reason = "Stack too deep", maxDepth = MaxCallDepth, depth = c.msg.depth
|
||
return
|
||
|
||
if endowment != 0:
|
||
let senderBalance = c.getBalance(c.msg.contractAddress)
|
||
if senderBalance < endowment:
|
||
debug "Computation Failure", reason = "Insufficient funds available to transfer", required = endowment, balance = senderBalance
|
||
return
|
||
|
||
var createMsgGas = c.gasMeter.gasRemaining
|
||
if c.fork >= FkTangerine:
|
||
createMsgGas -= createMsgGas div 64
|
||
c.gasMeter.consumeGas(createMsgGas, reason="CREATE")
|
||
|
||
block:
|
||
let childMsg = Message(
|
||
kind: callKind,
|
||
depth: c.msg.depth + 1,
|
||
gas: createMsgGas,
|
||
sender: c.msg.contractAddress,
|
||
value: endowment,
|
||
data: c.memory.read(memPos, memLen)
|
||
)
|
||
|
||
var child = newComputation(c.vmState, childMsg, salt)
|
||
c.chainTo(child):
|
||
if not child.shouldBurnGas:
|
||
c.gasMeter.returnGas(child.gasMeter.gasRemaining)
|
||
|
||
if child.isSuccess:
|
||
c.merge(child)
|
||
c.stack.top child.msg.contractAddress
|
||
else:
|
||
c.returnData = child.output
|
||
|
||
genCreate(create, Create)
|
||
genCreate(create2, Create2)
|
||
|
||
proc callParams(c: Computation): (UInt256, UInt256, EthAddress, EthAddress, CallKind, int, int, int, int, MsgFlags) =
|
||
let gas = c.stack.popInt()
|
||
let destination = c.stack.popAddress()
|
||
let value = c.stack.popInt()
|
||
|
||
result = (gas,
|
||
value,
|
||
destination,
|
||
c.msg.contractAddress, # sender
|
||
evmcCall,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.msg.flags)
|
||
|
||
proc callCodeParams(c: Computation): (UInt256, UInt256, EthAddress, EthAddress, CallKind, int, int, int, int, MsgFlags) =
|
||
let gas = c.stack.popInt()
|
||
let destination = c.stack.popAddress()
|
||
let value = c.stack.popInt()
|
||
|
||
result = (gas,
|
||
value,
|
||
destination,
|
||
c.msg.contractAddress, # sender
|
||
evmcCallCode,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.msg.flags)
|
||
|
||
proc delegateCallParams(c: Computation): (UInt256, UInt256, EthAddress, EthAddress, CallKind, int, int, int, int, MsgFlags) =
|
||
let gas = c.stack.popInt()
|
||
let destination = c.stack.popAddress()
|
||
|
||
result = (gas,
|
||
c.msg.value, # value
|
||
destination,
|
||
c.msg.sender, # sender
|
||
evmcDelegateCall,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.msg.flags)
|
||
|
||
proc staticCallParams(c: Computation): (UInt256, UInt256, EthAddress, EthAddress, CallKind, int, int, int, int, MsgFlags) =
|
||
let gas = c.stack.popInt()
|
||
let destination = c.stack.popAddress()
|
||
|
||
result = (gas,
|
||
0.u256, # value
|
||
destination,
|
||
c.msg.contractAddress, # sender
|
||
evmcCall,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.stack.popInt().cleanMemRef,
|
||
c.stack.popInt().cleanMemRef,
|
||
emvcStatic) # is_static
|
||
|
||
template genCall(callName: untyped, opCode: Op): untyped =
|
||
op callName, inline = false:
|
||
## CALL, 0xf1, Message-Call into an account
|
||
## CALLCODE, 0xf2, Message-call into this account with an alternative account's code.
|
||
## DELEGATECALL, 0xf4, Message-call into this account with an alternative account's code, but persisting the current values for sender and value.
|
||
## STATICCALL, 0xfa, Static message-call into an account.
|
||
when opCode == Call:
|
||
if emvcStatic == c.msg.flags and c.stack[^3, Uint256] > 0.u256:
|
||
raise newException(StaticContextError, "Cannot modify state while inside of a STATICCALL context")
|
||
|
||
let (gas, value, destination, sender, callKind,
|
||
memInPos, memInLen, memOutPos, memOutLen, flags) = `callName Params`(c)
|
||
|
||
push: 0
|
||
|
||
let (memOffset, memLength) = if calcMemSize(memInPos, memInLen) > calcMemSize(memOutPos, memOutLen):
|
||
(memInPos, memInLen)
|
||
else:
|
||
(memOutPos, memOutLen)
|
||
|
||
# EIP2929
|
||
# This came before old gas calculator
|
||
# because it will affect `c.gasMeter.gasRemaining`
|
||
# and further `childGasLimit`
|
||
if c.fork >= FkBerlin:
|
||
c.vmState.mutateStateDB:
|
||
if not db.inAccessList(destination):
|
||
db.accessList(destination)
|
||
# The WarmStorageReadCostEIP2929 (100) is already deducted in the form of a constant `gasCall`
|
||
c.gasMeter.consumeGas(ColdAccountAccessCost - WarmStorageReadCost, reason = "EIP2929 gasCall")
|
||
|
||
let contractAddress = when opCode in {Call, StaticCall}: destination else: c.msg.contractAddress
|
||
var (gasCost, childGasLimit) = c.gasCosts[opCode].c_handler(
|
||
value,
|
||
GasParams(kind: opCode,
|
||
c_isNewAccount: not c.accountExists(contractAddress),
|
||
c_gasBalance: c.gasMeter.gasRemaining,
|
||
c_contractGas: gas,
|
||
c_currentMemSize: c.memory.len,
|
||
c_memOffset: memOffset,
|
||
c_memLength: memLength
|
||
))
|
||
|
||
# EIP 2046: temporary disabled
|
||
# reduce gas fee for precompiles
|
||
# from 700 to 40
|
||
#when opCode == StaticCall:
|
||
# if c.fork >= FkBerlin and destination.toInt <= MaxPrecompilesAddr:
|
||
# gasCost = gasCost - 660.GasInt
|
||
|
||
if gasCost >= 0:
|
||
c.gasMeter.consumeGas(gasCost, reason = $opCode)
|
||
|
||
c.returnData.setLen(0)
|
||
|
||
if c.msg.depth >= MaxCallDepth:
|
||
debug "Computation Failure", reason = "Stack too deep", maximumDepth = MaxCallDepth, depth = c.msg.depth
|
||
# return unused gas
|
||
c.gasMeter.returnGas(childGasLimit)
|
||
return
|
||
|
||
if gasCost < 0 and childGasLimit <= 0:
|
||
raise newException(OutOfGas, "Gas not enough to perform calculation (" & callName.astToStr & ")")
|
||
|
||
c.memory.extend(memInPos, memInLen)
|
||
c.memory.extend(memOutPos, memOutLen)
|
||
|
||
when opCode in {CallCode, Call}:
|
||
let senderBalance = c.getBalance(sender)
|
||
if senderBalance < value:
|
||
debug "Insufficient funds", available = senderBalance, needed = c.msg.value
|
||
# return unused gas
|
||
c.gasMeter.returnGas(childGasLimit)
|
||
return
|
||
|
||
block:
|
||
let msg = Message(
|
||
kind: callKind,
|
||
depth: c.msg.depth + 1,
|
||
gas: childGasLimit,
|
||
sender: sender,
|
||
contractAddress: contractAddress,
|
||
codeAddress: destination,
|
||
value: value,
|
||
data: c.memory.read(memInPos, memInLen),
|
||
flags: flags)
|
||
|
||
var child = newComputation(c.vmState, msg)
|
||
c.chainTo(child):
|
||
if not child.shouldBurnGas:
|
||
c.gasMeter.returnGas(child.gasMeter.gasRemaining)
|
||
|
||
if child.isSuccess:
|
||
c.merge(child)
|
||
c.stack.top(1)
|
||
|
||
c.returnData = child.output
|
||
let actualOutputSize = min(memOutLen, child.output.len)
|
||
if actualOutputSize > 0:
|
||
c.memory.write(memOutPos,
|
||
child.output.toOpenArray(0, actualOutputSize - 1))
|
||
|
||
genCall(call, Call)
|
||
genCall(callCode, CallCode)
|
||
genCall(delegateCall, DelegateCall)
|
||
genCall(staticCall, StaticCall)
|
||
|
||
op returnOp, inline = false, startPos, size:
|
||
## 0xf3, Halt execution returning output data.
|
||
let (pos, len) = (startPos.cleanMemRef, size.cleanMemRef)
|
||
|
||
c.gasMeter.consumeGas(
|
||
c.gasCosts[Return].m_handler(c.memory.len, pos, len),
|
||
reason = "RETURN"
|
||
)
|
||
|
||
c.memory.extend(pos, len)
|
||
c.output = c.memory.read(pos, len)
|
||
|
||
op revert, inline = false, startPos, size:
|
||
## 0xfd, Halt execution reverting state changes but returning data and remaining gas.
|
||
let (pos, len) = (startPos.cleanMemRef, size.cleanMemRef)
|
||
c.gasMeter.consumeGas(
|
||
c.gasCosts[Revert].m_handler(c.memory.len, pos, len),
|
||
reason = "REVERT"
|
||
)
|
||
|
||
c.memory.extend(pos, len)
|
||
c.output = c.memory.read(pos, len)
|
||
# setError(msg, false) will signal cheap revert
|
||
c.setError("REVERT opcode executed", false)
|
||
|
||
op selfDestruct, inline = false:
|
||
## 0xff Halt execution and register account for later deletion.
|
||
let beneficiary = c.stack.popAddress()
|
||
c.selfDestruct(beneficiary)
|
||
|
||
op selfDestructEip150, inline = false:
|
||
let beneficiary = c.stack.popAddress()
|
||
|
||
let gasParams = GasParams(kind: SelfDestruct,
|
||
sd_condition: not c.accountExists(beneficiary)
|
||
)
|
||
|
||
let gasCost = c.gasCosts[SelfDestruct].c_handler(0.u256, gasParams).gasCost
|
||
c.gasMeter.consumeGas(gasCost, reason = "SELFDESTRUCT EIP150")
|
||
c.selfDestruct(beneficiary)
|
||
|
||
op selfDestructEip161, inline = false:
|
||
checkInStaticContext(c)
|
||
|
||
let
|
||
beneficiary = c.stack.popAddress()
|
||
isDead = not c.accountExists(beneficiary)
|
||
balance = c.getBalance(c.msg.contractAddress)
|
||
|
||
let gasParams = GasParams(kind: SelfDestruct,
|
||
sd_condition: isDead and not balance.isZero
|
||
)
|
||
|
||
let gasCost = c.gasCosts[SelfDestruct].c_handler(0.u256, gasParams).gasCost
|
||
c.gasMeter.consumeGas(gasCost, reason = "SELFDESTRUCT EIP161")
|
||
c.selfDestruct(beneficiary)
|
||
|
||
# Constantinople's new opcodes
|
||
op shlOp, inline = true, shift, num:
|
||
let shiftLen = shift.safeInt
|
||
if shiftLen >= 256:
|
||
push: 0
|
||
else:
|
||
push: num shl shiftLen
|
||
|
||
op shrOp, inline = true, shift, num:
|
||
let shiftLen = shift.safeInt
|
||
if shiftLen >= 256:
|
||
push: 0
|
||
else:
|
||
# uint version of `shr`
|
||
push: num shr shiftLen
|
||
|
||
op sarOp, inline = true:
|
||
let shiftLen = c.stack.popInt().safeInt
|
||
let num = cast[Int256](c.stack.popInt())
|
||
if shiftLen >= 256:
|
||
if num.isNegative:
|
||
push: cast[Uint256]((-1).i256)
|
||
else:
|
||
push: 0
|
||
else:
|
||
# int version of `shr` then force the result
|
||
# into uint256
|
||
push: cast[Uint256](num shr shiftLen)
|
||
|
||
op extCodeHash, inline = true:
|
||
let address = c.stack.popAddress()
|
||
push: c.getCodeHash(address)
|
||
|
||
op balanceEIP2929, inline = true:
|
||
## 0x31, Get balance of the given account.
|
||
let address = c.stack.popAddress()
|
||
|
||
c.gasEip2929AccountCheck(address, gasFees[c.fork][GasBalance])
|
||
push: c.getBalance(address)
|
||
|
||
op extCodeHashEIP2929, inline = true:
|
||
let address = c.stack.popAddress()
|
||
c.gasEip2929AccountCheck(address, gasFees[c.fork][GasExtCodeHash])
|
||
push: c.getCodeHash(address)
|
||
|
||
op extCodeSizeEIP2929, inline = true:
|
||
## 0x3b, Get size of an account's code
|
||
let address = c.stack.popAddress()
|
||
c.gasEip2929AccountCheck(address, gasFees[c.fork][GasExtCode])
|
||
push: c.getCodeSize(address)
|
||
|
||
op extCodeCopyEIP2929, inline = true:
|
||
## 0x3c, Copy an account's code to memory.
|
||
let address = c.stack.popAddress()
|
||
let (memStartPos, codeStartPos, size) = c.stack.popInt(3)
|
||
let (memPos, codePos, len) = (memStartPos.cleanMemRef, codeStartPos.cleanMemRef, size.cleanMemRef)
|
||
|
||
c.gasMeter.consumeGas(
|
||
c.gasCosts[ExtCodeCopy].m_handler(c.memory.len, memPos, len),
|
||
reason="ExtCodeCopy fee")
|
||
|
||
c.gasEip2929AccountCheck(address, gasFees[c.fork][GasExtCode])
|
||
|
||
let codeBytes = c.getCode(address)
|
||
c.memory.writePaddedResult(codeBytes, memPos, codePos, len)
|
||
|
||
op selfDestructEIP2929, inline = false:
|
||
checkInStaticContext(c)
|
||
|
||
let
|
||
beneficiary = c.stack.popAddress()
|
||
isDead = not c.accountExists(beneficiary)
|
||
balance = c.getBalance(c.msg.contractAddress)
|
||
|
||
let gasParams = GasParams(kind: SelfDestruct,
|
||
sd_condition: isDead and not balance.isZero
|
||
)
|
||
|
||
var gasCost = c.gasCosts[SelfDestruct].c_handler(0.u256, gasParams).gasCost
|
||
|
||
c.vmState.mutateStateDB:
|
||
if not db.inAccessList(beneficiary):
|
||
db.accessList(beneficiary)
|
||
gasCost = gasCost + ColdAccountAccessCost
|
||
|
||
c.gasMeter.consumeGas(gasCost, reason = "SELFDESTRUCT EIP161")
|
||
c.selfDestruct(beneficiary)
|
||
|
||
op sloadEIP2929, inline = true, slot:
|
||
## 0x54, Load word from storage.
|
||
c.vmState.mutateStateDB:
|
||
let gasCost = if not db.inAccessList(c.msg.contractAddress, slot):
|
||
db.accessList(c.msg.contractAddress, slot)
|
||
ColdSloadCost
|
||
else:
|
||
WarmStorageReadCost
|
||
c.gasMeter.consumeGas(gasCost, reason = "sloadEIP2929")
|
||
|
||
push: c.getStorage(slot)
|
||
|
||
op sstoreEIP2929, inline = false, slot, newValue:
|
||
checkInStaticContext(c)
|
||
const SentryGasEIP2200 = 2300 # Minimum gas required to be present for an SSTORE call, not consumed
|
||
|
||
if c.gasMeter.gasRemaining <= SentryGasEIP2200:
|
||
raise newException(OutOfGas, "Gas not enough to perform EIP2200 SSTORE")
|
||
|
||
c.vmState.mutateStateDB:
|
||
if not db.inAccessList(c.msg.contractAddress, slot):
|
||
db.accessList(c.msg.contractAddress, slot)
|
||
c.gasMeter.consumeGas(ColdSloadCost, reason = "sstoreEIP2929")
|
||
|
||
block:
|
||
sstoreNetGasMeteringImpl(c, slot, newValue)
|