from eth._utils.numeric import ceil32
from typing import Tuple
from mythril.support.opcodes import OPCODES, STACK, GAS
from eth.constants import (
GAS_ECRECOVER,
GAS_SHA256WORD,
GAS_SHA256,
GAS_RIPEMD160,
GAS_RIPEMD160WORD,
GAS_IDENTITY,
GAS_IDENTITYWORD,
GAS_SHA3WORD,
GAS_SHA3,
)
[docs]def calculate_sha3_gas(length: int):
"""
:param length:
:return:
"""
gas_val = GAS_SHA3 + GAS_SHA3WORD * (ceil32(length) // 32)
return gas_val, gas_val
[docs]def calculate_native_gas(size: int, contract: str):
"""
:param size:
:param contract:
:return:
"""
gas_value = 0
word_num = ceil32(size) // 32
if contract == "ecrecover":
gas_value = GAS_ECRECOVER
elif contract == "sha256":
gas_value = GAS_SHA256 + word_num * GAS_SHA256WORD
elif contract == "ripemd160":
gas_value = GAS_RIPEMD160 + word_num * GAS_RIPEMD160WORD
elif contract == "identity":
gas_value = GAS_IDENTITY + word_num * GAS_IDENTITYWORD
else:
# TODO: Add gas for other precompiles, computation should be shifted to natives.py
# as some data isn't available here
pass
return gas_value, gas_value
[docs]def get_opcode_gas(opcode: str) -> Tuple[int, int]:
return OPCODES[opcode][GAS]
[docs]def get_required_stack_elements(opcode: str) -> int:
return OPCODES[opcode][STACK][0]