nimbus-eth1/tests/test_memory.nim

73 lines
3.1 KiB
Nim

# 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 unittest, macros, strformat, strutils, sequtils,
ttmath,
../src/[constants, opcode_values, errors, vm/memory]
proc memory32: Memory =
result = newMemory()
result.extend(0.u256, 32.u256)
proc memory128: Memory =
result = newMemory()
result.extend(0.u256, 128.u256)
suite "memory":
test "write":
var mem = memory32()
# Test that write creates 32byte string == value padded with zeros
mem.write(startPosition = 0.u256, size = 4.u256, value = @[1.byte, 0.byte, 1.byte, 0.byte])
check(mem.bytes == @[1.byte, 0.byte, 1.byte, 0.byte].concat(repeat(0.byte, 28)))
# test "write rejects invalid position":
# expect(ValidationError):
# var mem = memory32()
# mem.write(startPosition = -1.i256, size = 2.i256, value = @[1.byte, 0.byte])
# expect(ValidationError):
# TODO: work on 256
# var mem = memory32()
# echo "pow ", pow(2.i256, 255) - 1.i256
# mem.write(startPosition = pow(2.i256, 256), size = 2.i256, value = @[1.byte, 0.byte])
test "write rejects invalid size":
# expect(ValidationError):
# var mem = memory32()
# mem.write(startPosition = 0.i256, size = -1.i256, value = @[1.byte, 0.byte])
expect(ValidationError):
var mem = memory32()
mem.write(startPosition = 0.u256, size = pow(2.u256, 256), value = @[1.byte, 0.byte])
test "write rejects invalid value":
expect(ValidationError):
var mem = memory32()
mem.write(startPosition = 0.u256, size = 4.u256, value = @[1.byte, 0.byte])
test "write rejects valyes beyond memory size":
expect(ValidationError):
var mem = memory128()
mem.write(startPosition = 128.u256, size = 4.u256, value = @[1.byte, 0.byte, 1.byte, 0.byte])
test "extends appropriately extends memory":
var mem = newMemory()
# Test extends to 32 byte array: 0 < (start_position + size) <= 32
mem.extend(startPosition = 0.u256, size = 10.u256)
check(mem.bytes == repeat(0.byte, 32))
# Test will extend past length if params require: 32 < (start_position + size) <= 64
mem.extend(startPosition = 28.u256, size = 32.u256)
check(mem.bytes == repeat(0.byte, 64))
# Test won't extend past length unless params require: 32 < (start_position + size) <= 64
mem.extend(startPosition = 48.u256, size = 10.u256)
check(mem.bytes == repeat(0.byte, 64))
test "read returns correct bytes":
var mem = memory32()
mem.write(startPosition = 5.u256, size = 4.u256, value = @[1.byte, 0.byte, 1.byte, 0.byte])
check(mem.read(startPosition = 5.u256, size = 4.u256) == @[1.byte, 0.byte, 1.byte, 0.byte])
check(mem.read(startPosition = 6.u256, size = 4.u256) == @[0.byte, 1.byte, 0.byte, 0.byte])
check(mem.read(startPosition = 1.u256, size = 3.u256) == @[0.byte, 0.byte, 0.byte])