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stack.py
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"""
Ethereum Virtual Machine (EVM) Stack Instructions
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. contents:: Table of Contents
:backlinks: none
:local:
Introduction
------------
Implementations of the EVM stack related instructions.
"""
from functools import partial
from ethereum_types.numeric import U256, Uint
from .. import Evm, stack
from ..exceptions import StackUnderflowError
from ..gas import GAS_BASE, GAS_VERY_LOW, charge_gas
from ..memory import buffer_read
def pop(evm: Evm) -> None:
"""
Remove item from stack.
Parameters
----------
evm :
The current EVM frame.
"""
# STACK
stack.pop(evm.stack)
# GAS
charge_gas(evm, GAS_BASE)
# OPERATION
pass
# PROGRAM COUNTER
evm.pc += Uint(1)
def push_n(evm: Evm, num_bytes: int) -> None:
"""
Pushes a N-byte immediate onto the stack.
Parameters
----------
evm :
The current EVM frame.
num_bytes :
The number of immediate bytes to be read from the code and pushed to
the stack.
"""
# STACK
pass
# GAS
charge_gas(evm, GAS_VERY_LOW)
# OPERATION
data_to_push = U256.from_be_bytes(
buffer_read(evm.code, U256(evm.pc + Uint(1)), U256(num_bytes))
)
stack.push(evm.stack, data_to_push)
# PROGRAM COUNTER
evm.pc += Uint(1) + Uint(num_bytes)
def dup_n(evm: Evm, item_number: int) -> None:
"""
Duplicate the Nth stack item (from top of the stack) to the top of stack.
Parameters
----------
evm :
The current EVM frame.
item_number :
The stack item number (0-indexed from top of stack) to be duplicated
to the top of stack.
"""
# STACK
pass
# GAS
charge_gas(evm, GAS_VERY_LOW)
if item_number >= len(evm.stack):
raise StackUnderflowError
data_to_duplicate = evm.stack[len(evm.stack) - 1 - item_number]
stack.push(evm.stack, data_to_duplicate)
# PROGRAM COUNTER
evm.pc += Uint(1)
def swap_n(evm: Evm, item_number: int) -> None:
"""
Swap the top and the `item_number` element of the stack, where
the top of the stack is position zero.
If `item_number` is zero, this function does nothing (which should not be
possible, since there is no `SWAP0` instruction).
Parameters
----------
evm :
The current EVM frame.
item_number :
The stack item number (0-indexed from top of stack) to be swapped
with the top of stack element.
"""
# STACK
pass
# GAS
charge_gas(evm, GAS_VERY_LOW)
if item_number >= len(evm.stack):
raise StackUnderflowError
evm.stack[-1], evm.stack[-1 - item_number] = (
evm.stack[-1 - item_number],
evm.stack[-1],
)
# PROGRAM COUNTER
evm.pc += Uint(1)
push1 = partial(push_n, num_bytes=1)
push2 = partial(push_n, num_bytes=2)
push3 = partial(push_n, num_bytes=3)
push4 = partial(push_n, num_bytes=4)
push5 = partial(push_n, num_bytes=5)
push6 = partial(push_n, num_bytes=6)
push7 = partial(push_n, num_bytes=7)
push8 = partial(push_n, num_bytes=8)
push9 = partial(push_n, num_bytes=9)
push10 = partial(push_n, num_bytes=10)
push11 = partial(push_n, num_bytes=11)
push12 = partial(push_n, num_bytes=12)
push13 = partial(push_n, num_bytes=13)
push14 = partial(push_n, num_bytes=14)
push15 = partial(push_n, num_bytes=15)
push16 = partial(push_n, num_bytes=16)
push17 = partial(push_n, num_bytes=17)
push18 = partial(push_n, num_bytes=18)
push19 = partial(push_n, num_bytes=19)
push20 = partial(push_n, num_bytes=20)
push21 = partial(push_n, num_bytes=21)
push22 = partial(push_n, num_bytes=22)
push23 = partial(push_n, num_bytes=23)
push24 = partial(push_n, num_bytes=24)
push25 = partial(push_n, num_bytes=25)
push26 = partial(push_n, num_bytes=26)
push27 = partial(push_n, num_bytes=27)
push28 = partial(push_n, num_bytes=28)
push29 = partial(push_n, num_bytes=29)
push30 = partial(push_n, num_bytes=30)
push31 = partial(push_n, num_bytes=31)
push32 = partial(push_n, num_bytes=32)
dup1 = partial(dup_n, item_number=0)
dup2 = partial(dup_n, item_number=1)
dup3 = partial(dup_n, item_number=2)
dup4 = partial(dup_n, item_number=3)
dup5 = partial(dup_n, item_number=4)
dup6 = partial(dup_n, item_number=5)
dup7 = partial(dup_n, item_number=6)
dup8 = partial(dup_n, item_number=7)
dup9 = partial(dup_n, item_number=8)
dup10 = partial(dup_n, item_number=9)
dup11 = partial(dup_n, item_number=10)
dup12 = partial(dup_n, item_number=11)
dup13 = partial(dup_n, item_number=12)
dup14 = partial(dup_n, item_number=13)
dup15 = partial(dup_n, item_number=14)
dup16 = partial(dup_n, item_number=15)
swap1 = partial(swap_n, item_number=1)
swap2 = partial(swap_n, item_number=2)
swap3 = partial(swap_n, item_number=3)
swap4 = partial(swap_n, item_number=4)
swap5 = partial(swap_n, item_number=5)
swap6 = partial(swap_n, item_number=6)
swap7 = partial(swap_n, item_number=7)
swap8 = partial(swap_n, item_number=8)
swap9 = partial(swap_n, item_number=9)
swap10 = partial(swap_n, item_number=10)
swap11 = partial(swap_n, item_number=11)
swap12 = partial(swap_n, item_number=12)
swap13 = partial(swap_n, item_number=13)
swap14 = partial(swap_n, item_number=14)
swap15 = partial(swap_n, item_number=15)
swap16 = partial(swap_n, item_number=16)