def attribute(self):
# x.balance: balance of address x
if self.expr.attr == 'balance':
addr = Expr.parse_value_expr(self.expr.value, self.context)
if not is_base_type(addr.typ, 'address'):
raise TypeMismatchException("Type mismatch: balance keyword expects an address as input", self.expr)
return LLLnode.from_list(['balance', addr], typ=BaseType('int128', {'wei': 1}), location=None, pos=getpos(self.expr))
# x.codesize: codesize of address x
elif self.expr.attr == 'codesize' or self.expr.attr == 'is_contract':
addr = Expr.parse_value_expr(self.expr.value, self.context)
if not is_base_type(addr.typ, 'address'):
raise TypeMismatchException("Type mismatch: codesize keyword expects an address as input", self.expr)
if self.expr.attr == 'codesize':
eval_code = ['extcodesize', addr]
output_type = 'int128'
else:
eval_code = ['gt', ['extcodesize', addr], 0]
output_type = 'bool'
return LLLnode.from_list(eval_code, typ=BaseType(output_type), location=None, pos=getpos(self.expr))
# self.x: global attribute
elif isinstance(self.expr.value, ast.Name) and self.expr.value.id == "self":
if self.expr.attr not in self.context.globals:
raise VariableDeclarationException("Persistent variable undeclared: " + self.expr.attr, self.expr)
var = self.context.globals[self.expr.attr]
return LLLnode.from_list(var.pos, typ=var.typ, location='storage', pos=getpos(self.expr), annotation='self.' + self.expr.attr)
# Reserved keywords
elif isinstance(self.expr.value, ast.Name) and self.expr.value.id in ("msg", "block", "tx"):
key = self.expr.value.id + "." + self.expr.attr
if key == "msg.sender":
return LLLnode.from_list(['caller'], typ='address', pos=getpos(self.expr))
elif key == "msg.value":
if not self.context.is_payable:
raise NonPayableViolationException("Cannot use msg.value in a non-payable function", self.expr)
return LLLnode.from_list(['callvalue'], typ=BaseType('int128', {'wei': 1}), pos=getpos(self.expr))
elif key == "msg.gas":
return LLLnode.from_list(['gas'], typ='int128', pos=getpos(self.expr))
elif key == "block.difficulty":
return LLLnode.from_list(['difficulty'], typ='int128', pos=getpos(self.expr))
elif key == "block.timestamp":
return LLLnode.from_list(['timestamp'], typ=BaseType('int128', {'sec': 1}, True), pos=getpos(self.expr))
elif key == "block.coinbase":
return LLLnode.from_list(['coinbase'], typ='address', pos=getpos(self.expr))
elif key == "block.number":
return LLLnode.from_list(['number'], typ='int128', pos=getpos(self.expr))
elif key == "block.prevhash":
return LLLnode.from_list(['blockhash', ['sub', 'number', 1]], typ='bytes32', pos=getpos(self.expr))
elif key == "tx.origin":
return LLLnode.from_list(['origin'], typ='address', pos=getpos(self.expr))
else:
raise Exception("Unsupported keyword: " + key)
# Other variables
else:
sub = Expr.parse_variable_location(self.expr.value, self.context)
if not isinstance(sub.typ, StructType):
raise TypeMismatchException("Type mismatch: member variable access not expected", self.expr.value)
attrs = sorted(sub.typ.members.keys())
if self.expr.attr not in attrs:
raise TypeMismatchException("Member %s not found. Only the following available: %s" % (self.expr.attr, " ".join(attrs)), self.expr)
return add_variable_offset(sub, self.expr.attr, pos=getpos(self.expr))
def attribute(self):
# x.balance: balance of address x
if self.expr.attr == 'balance':
addr = Expr.parse_value_expr(self.expr.value, self.context)
if not is_base_type(addr.typ, 'address'):
raise TypeMismatchException(
"Type mismatch: balance keyword expects an address as input",
self.expr
)
if (
isinstance(self.expr.value, vy_ast.Name) and
self.expr.value.id == "self" and
version_check(begin="istanbul")
):
seq = ['selfbalance']
else:
seq = ['balance', addr]
return LLLnode.from_list(
seq,
typ=BaseType('uint256', {'wei': 1}),
location=None,
pos=getpos(self.expr),
)
# x.codesize: codesize of address x
elif self.expr.attr == 'codesize' or self.expr.attr == 'is_contract':
addr = Expr.parse_value_expr(self.expr.value, self.context)
if not is_base_type(addr.typ, 'address'):
raise TypeMismatchException(
"Type mismatch: codesize keyword expects an address as input",
self.expr,
)
if self.expr.attr == 'codesize':
eval_code = ['extcodesize', addr]
output_type = 'int128'
else:
eval_code = ['gt', ['extcodesize', addr], 0]
output_type = 'bool'
return LLLnode.from_list(
eval_code,
typ=BaseType(output_type),
location=None,
pos=getpos(self.expr),
)
# x.codehash: keccak of address x
elif self.expr.attr == 'codehash':
addr = Expr.parse_value_expr(self.expr.value, self.context)
if not is_base_type(addr.typ, 'address'):
raise TypeMismatchException(
"codehash keyword expects an address as input",
self.expr,
)
if not version_check(begin="constantinople"):
raise EvmVersionException(
"address.codehash is unavailable prior to constantinople ruleset",
self.expr
)
return LLLnode.from_list(
['extcodehash', addr],
typ=BaseType('bytes32'),
location=None,
pos=getpos(self.expr)
)
# self.x: global attribute
elif isinstance(self.expr.value, vy_ast.Name) and self.expr.value.id == "self":
if self.expr.attr not in self.context.globals:
raise VariableDeclarationException(
"Persistent variable undeclared: " + self.expr.attr,
self.expr,
)
var = self.context.globals[self.expr.attr]
return LLLnode.from_list(
var.pos,
typ=var.typ,
location='storage',
pos=getpos(self.expr),
annotation='self.' + self.expr.attr,
)
# Reserved keywords
elif (
isinstance(self.expr.value, vy_ast.Name) and
self.expr.value.id in ENVIRONMENT_VARIABLES
):
key = self.expr.value.id + "." + self.expr.attr
if key == "msg.sender":
if self.context.is_private:
raise ParserException("msg.sender not allowed in private functions.", self.expr)
return LLLnode.from_list(['caller'], typ='address', pos=getpos(self.expr))
elif key == "msg.value":
if not self.context.is_payable:
raise NonPayableViolationException(
"Cannot use msg.value in a non-payable function", self.expr,
)
return LLLnode.from_list(
['callvalue'],
typ=BaseType('uint256', {'wei': 1}),
pos=getpos(self.expr),
)
elif key == "msg.gas":
return LLLnode.from_list(
['gas'],
typ='uint256',
pos=getpos(self.expr),
)
elif key == "block.difficulty":
return LLLnode.from_list(
['difficulty'],
typ='uint256',
pos=getpos(self.expr),
)
elif key == "block.timestamp":
return LLLnode.from_list(
['timestamp'],
typ=BaseType('uint256', {'sec': 1}, True),
pos=getpos(self.expr),
)
elif key == "block.coinbase":
return LLLnode.from_list(['coinbase'], typ='address', pos=getpos(self.expr))
elif key == "block.number":
return LLLnode.from_list(['number'], typ='uint256', pos=getpos(self.expr))
elif key == "block.prevhash":
return LLLnode.from_list(
['blockhash', ['sub', 'number', 1]],
typ='bytes32',
pos=getpos(self.expr),
)
elif key == "tx.origin":
return LLLnode.from_list(['origin'], typ='address', pos=getpos(self.expr))
elif key == "chain.id":
if not version_check(begin="istanbul"):
raise EvmVersionException(
"chain.id is unavailable prior to istanbul ruleset",
self.expr
)
return LLLnode.from_list(['chainid'], typ='uint256', pos=getpos(self.expr))
else:
raise ParserException("Unsupported keyword: " + key, self.expr)
# Other variables
else:
sub = Expr.parse_variable_location(self.expr.value, self.context)
# contract type
if isinstance(sub.typ, ContractType):
return sub
if not isinstance(sub.typ, StructType):
raise TypeMismatchException(
"Type mismatch: member variable access not expected",
self.expr.value,
)
attrs = list(sub.typ.members.keys())
if self.expr.attr not in attrs:
raise TypeMismatchException(
f"Member {self.expr.attr} not found. Only the following available: "
f"{' '.join(attrs)}",
self.expr,
)
return add_variable_offset(sub, self.expr.attr, pos=getpos(self.expr))
