57 lines
1.6 KiB
Nim
57 lines
1.6 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 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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sequtils,
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chronicles, eth/common/eth_types,
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../errors, ../validation,
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./interpreter/utils/utils_numeric
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logScope:
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topics = "vm memory"
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type
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Memory* = ref object
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bytes*: seq[byte]
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proc newMemory*: Memory =
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new(result)
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result.bytes = @[]
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proc len*(memory: Memory): int =
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result = memory.bytes.len
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proc extend*(memory: var Memory; startPos: Natural; size: Natural) =
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if size == 0:
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return
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var newSize = ceil32(startPos + size)
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if newSize <= len(memory):
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return
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var sizeToExtend = newSize - len(memory)
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memory.bytes = memory.bytes.concat(repeat(0.byte, sizeToExtend))
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proc newMemory*(size: Natural): Memory =
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result = newMemory()
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result.extend(0, size)
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proc read*(memory: var Memory, startPos: Natural, size: Natural): seq[byte] =
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# TODO: use an openarray[byte]
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result = memory.bytes[startPos ..< (startPos + size)]
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proc write*(memory: var Memory, startPos: Natural, value: openarray[byte]) =
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let size = value.len
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if size == 0:
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return
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#echo size
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#echo startPos
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validateLte(startPos + size, memory.len)
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if memory.len < startPos + size:
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memory.bytes = memory.bytes.concat(repeat(0.byte, memory.len - (startPos + size))) # TODO: better logarithmic scaling?
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for z, b in value:
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memory.bytes[z + startPos] = b
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