371 lines
12 KiB
Nim
371 lines
12 KiB
Nim
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# 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: Environmental Information
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## ==============================================
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##
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const
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kludge {.intdefine.}: int = 0
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breakCircularDependency {.used.} = kludge > 0
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import
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../../../errors,
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./oph_defs,
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sequtils,
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strformat,
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stint
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# ------------------------------------------------------------------------------
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# Kludge BEGIN
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# ------------------------------------------------------------------------------
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when not breakCircularDependency:
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import
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../../code_stream,
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../../stack,
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../../v2computation,
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../../v2memory,
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../../v2state,
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../gas_meter,
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../utils/v2utils_numeric,
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eth/common
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else:
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import macros
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# copied from stack.nim
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macro genTupleType(len: static[int], elemType: untyped): untyped =
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result = nnkTupleConstr.newNimNode()
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for i in 0 ..< len: result.add(elemType)
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# function stubs from stack.nim (to satisfy compiler logic)
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proc push[T](x: Stack; n: T) = discard
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proc popAddress(x: var Stack): UInt256 = 0.u256
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proc popInt(x: var Stack, n: static[int]): auto =
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var rc: genTupleType(n, UInt256)
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return rc
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# function stubs from v2computation.nim (to satisfy compiler logic)
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proc getBalance[T](c: Computation, address: T): Uint256 = 0.u256
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proc getOrigin(c: Computation): Uint256 = 0.u256
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proc getGasPrice(c: Computation): Uint256 = 0.u256
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proc getCodeSize[T](c: Computation, address: T): uint = 0
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proc getCode[T](c: Computation, address: T): seq[byte] = @[]
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# function stubs from v2utils_numeric.nim
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func cleanMemRef(x: UInt256): int = 0
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# function stubs from v2memory.nim
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proc len(mem: Memory): int = 0
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proc extend(mem: var Memory; startPos: Natural; size: Natural) = discard
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proc write(mem: var Memory, startPos: Natural, val: openarray[byte]) = discard
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# function stubs from code_stream.nim
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proc len(c: CodeStream): int = len(c.bytes)
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# ------------------------------------------------------------------------------
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# Kludge END
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# ------------------------------------------------------------------------------
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# ------------------------------------------------------------------------------
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# Private helpers
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# ------------------------------------------------------------------------------
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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 =
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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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# ------------------------------------------------------------------------------
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# Private, op handlers implementation
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# ------------------------------------------------------------------------------
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const
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addressOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x30, Get address of currently executing account.
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k.cpt.stack.push:
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k.cpt.msg.contractAddress
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balanceOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x31, Get balance of the given account.
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let address = k.cpt.stack.popAddress
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k.cpt.stack.push:
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k.cpt.getBalance(address)
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originOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x32, Get execution origination address.
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k.cpt.stack.push:
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k.cpt.getOrigin()
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callerOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x33, Get caller address.
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k.cpt.stack.push:
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k.cpt.msg.sender
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callValueOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x34, Get deposited value by the instruction/transaction
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## responsible for this execution
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k.cpt.stack.push:
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k.cpt.msg.value
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callDataLoadOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x35, Get input data of current environment
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let (startPos) = k.cpt.stack.popInt(1)
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let start = startPos.cleanMemRef
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if start >= k.cpt.msg.data.len:
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k.cpt.stack.push:
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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(k.cpt.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] = k.cpt.msg.data.toOpenArray(start, endRange)
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k.cpt.stack.push:
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value
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callDataSizeOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x36, Get size of input data in current environment.
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k.cpt.stack.push:
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k.cpt.msg.data.len.u256
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callDataCopyOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x37, Copy input data in current environment to memory.
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let (memStartPos, copyStartPos, size) = k.cpt.stack.popInt(3)
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# TODO tests: https://github.com/status-im/nimbus/issues/67
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let (memPos, copyPos, len) =
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(memStartPos.cleanMemRef, copyStartPos.cleanMemRef, size.cleanMemRef)
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when not breakCircularDependency:
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k.cpt.gasMeter.consumeGas(
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k.cpt.gasCosts[CallDataCopy].m_handler(k.cpt.memory.len, memPos, len),
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reason = "CallDataCopy fee")
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k.cpt.memory.writePaddedResult(k.cpt.msg.data, memPos, copyPos, len)
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codeSizeOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x38, Get size of code running in current environment.
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k.cpt.stack.push:
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k.cpt.code.len
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codeCopyOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x39, Copy code running in current environment to memory.
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let (memStartPos, copyStartPos, size) = k.cpt.stack.popInt(3)
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# TODO tests: https://github.com/status-im/nimbus/issues/67
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let (memPos, copyPos, len) =
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(memStartPos.cleanMemRef, copyStartPos.cleanMemRef, size.cleanMemRef)
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when not breakCircularDependency:
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k.cpt.gasMeter.consumeGas(
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k.cpt.gasCosts[CodeCopy].m_handler(k.cpt.memory.len, memPos, len),
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reason = "CodeCopy fee")
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k.cpt.memory.writePaddedResult(k.cpt.code.bytes, memPos, copyPos, len)
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gasPriceOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x3A, Get price of gas in current environment.
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k.cpt.stack.push:
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k.cpt.getGasPrice
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extCodeSizeOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x3b, Get size of an account's code
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let address = k.cpt.stack.popAddress()
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k.cpt.stack.push:
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k.cpt.getCodeSize(address)
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extCodeCopyOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x3c, Copy an account's code to memory.
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let address = k.cpt.stack.popAddress()
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let (memStartPos, codeStartPos, size) = k.cpt.stack.popInt(3)
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let (memPos, codePos, len) =
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(memStartPos.cleanMemRef, codeStartPos.cleanMemRef, size.cleanMemRef)
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when not breakCircularDependency:
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k.cpt.gasMeter.consumeGas(
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k.cpt.gasCosts[ExtCodeCopy].m_handler(k.cpt.memory.len, memPos, len),
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reason = "ExtCodeCopy fee")
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let codeBytes = k.cpt.getCode(address)
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k.cpt.memory.writePaddedResult(codeBytes, memPos, codePos, len)
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returnDataSizeOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x3d, Get size of output data from the previous call from the
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## current environment.
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k.cpt.stack.push:
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k.cpt.returnData.len
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returnDataCopyOp: Vm2OpFn = proc (k: Vm2Ctx) =
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## 0x3e, Copy output data from the previous call to memory.
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let (memStartPos, copyStartPos, size) = k.cpt.stack.popInt(3)
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let (memPos, copyPos, len) =
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(memStartPos.cleanMemRef, copyStartPos.cleanMemRef, size.cleanMemRef)
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when not breakCircularDependency:
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let gasCost = k.cpt.gasCosts[ReturnDataCopy].m_handler(
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k.cpt.memory.len, memPos, len)
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k.cpt.gasMeter.consumeGas(gasCost, reason = "returnDataCopy fee")
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if copyPos + len > k.cpt.returnData.len:
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raise newException(
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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}. "&
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&"Return data is {k.cpt.returnData.len} in \n" &
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"length")
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k.cpt.memory.writePaddedResult(k.cpt.returnData, memPos, copyPos, len)
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# ------------------------------------------------------------------------------
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# Public, op exec table entries
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# ------------------------------------------------------------------------------
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const
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vm2OpExecEnvInfo*: seq[Vm2OpExec] = @[
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(opCode: Address, ## 0x20, Address
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forks: Vm2OpAllForks,
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info: "Get address of currently executing account",
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exec: (prep: vm2OpIgnore,
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run: addressOp,
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post: vm2OpIgnore)),
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(opCode: Balance, ## 0x31, Balance
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forks: Vm2OpAllForks,
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info: "Get balance of the given account",
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exec: (prep: vm2OpIgnore,
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run: balanceOp,
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post: vm2OpIgnore)),
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(opCode: Origin, ## 0x32, Origination address
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forks: Vm2OpAllForks,
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info: "Get execution origination address",
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exec: (prep: vm2OpIgnore,
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run: originOp,
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post: vm2OpIgnore)),
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(opCode: Caller, ## 0x33, Caller address
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forks: Vm2OpAllForks,
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info: "Get caller address",
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exec: (prep: vm2OpIgnore,
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run: callerOp,
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post: vm2OpIgnore)),
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(opCode: CallValue, ## 0x34, Execution deposited value
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forks: Vm2OpAllForks,
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info: "Get deposited value by the instruction/transaction " &
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"responsible for this execution",
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exec: (prep: vm2OpIgnore,
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run: callValueOp,
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post: vm2OpIgnore)),
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(opCode: CallDataLoad, ## 0x35, Input data
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forks: Vm2OpAllForks,
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info: "Get input data of current environment",
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exec: (prep: vm2OpIgnore,
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run: callDataLoadOp,
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post: vm2OpIgnore)),
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(opCode: CallDataSize, ## 0x36, Size of input data
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forks: Vm2OpAllForks,
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info: "Get size of input data in current environment",
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exec: (prep: vm2OpIgnore,
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run: callDataSizeOp,
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post: vm2OpIgnore)),
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(opCode: CallDataCopy, ## 0x37, Copy input data to memory.
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forks: Vm2OpAllForks,
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info: "Copy input data in current environment to memory",
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exec: (prep: vm2OpIgnore,
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run: callDataCopyOp,
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post: vm2OpIgnore)),
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(opCode: CodeSize, ## 0x38, Size of code
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forks: Vm2OpAllForks,
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info: "Get size of code running in current environment",
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exec: (prep: vm2OpIgnore,
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run: codeSizeOp,
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post: vm2OpIgnore)),
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(opCode: CodeCopy, ## 0x39, Copy code to memory.
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forks: Vm2OpAllForks,
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info: "Copy code running in current environment to memory",
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exec: (prep: vm2OpIgnore,
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run: codeCopyOp,
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post: vm2OpIgnore)),
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(opCode: GasPrice, ## 0x3a, Gas price
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forks: Vm2OpAllForks,
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info: "Get price of gas in current environment",
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exec: (prep: vm2OpIgnore,
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run: gasPriceOp,
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post: vm2OpIgnore)),
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(opCode: ExtCodeSize, ## 0x3b, Account code size
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forks: Vm2OpAllForks,
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info: "Get size of an account's code",
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exec: (prep: vm2OpIgnore,
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run: extCodeSizeOp,
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post: vm2OpIgnore)),
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(opCode: ExtCodeCopy, ## 0x3c, Account code copy to memory.
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forks: Vm2OpAllForks,
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info: "Copy an account's code to memory",
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exec: (prep: vm2OpIgnore,
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run: extCodeCopyOp,
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post: vm2OpIgnore)),
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(opCode: ReturnDataSize, ## 0x3d, Previous call output data size
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forks: Vm2OpAllForks,
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info: "Get size of output data from the previous call " &
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"from the current environment",
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exec: (prep: vm2OpIgnore,
|
||
|
|
run: returnDataSizeOp,
|
||
|
|
post: vm2OpIgnore)),
|
||
|
|
|
||
|
|
(opCode: ReturnDataCopy, ## 0x3e, Previous call output data copy to memory
|
||
|
|
forks: Vm2OpAllForks,
|
||
|
|
info: "Copy output data from the previous call to memory",
|
||
|
|
exec: (prep: vm2OpIgnore,
|
||
|
|
run: returnDataCopyOp,
|
||
|
|
post: vm2OpIgnore))]
|
||
|
|
|
||
|
|
# ------------------------------------------------------------------------------
|
||
|
|
# End
|
||
|
|
# ------------------------------------------------------------------------------
|