def validate(self):
if self.value < SizeLimits.MIN_INT256:
raise OverflowException(
"Value is below lower bound for all numeric types", self)
if self.value > SizeLimits.MAX_UINT256:
raise OverflowException(
"Value exceeds upper bound for all numeric types", self)
def validate(self):
if self.value.as_tuple().exponent < -MAX_DECIMAL_PLACES:
raise InvalidLiteral("Vyper supports a maximum of ten decimal points", self)
if self.value < SizeLimits.MIN_INT128:
raise OverflowException("Value is below lower bound for decimal types", self)
if self.value > SizeLimits.MAX_INT128:
raise OverflowException("Value exceeds upper bound for decimal types", self)
def from_literal(cls, node: vy_ast.Constant) -> BaseTypeDefinition:
obj = super().from_literal(node)
lower, upper = cls._bounds
if node.value < lower:
raise OverflowException(f"Value is below lower bound for given type ({lower})", node)
if node.value > upper:
raise OverflowException(f"Value exceeds upper bound for given type ({upper})", node)
return obj
def validate_numeric_op(
self, node: Union[vy_ast.UnaryOp, vy_ast.BinOp,
vy_ast.AugAssign]) -> None:
if self._invalid_op and isinstance(node.op, self._invalid_op):
raise InvalidOperation(
f"Cannot perform {node.op.description} on {self}", node)
if isinstance(node.op, vy_ast.Pow):
if isinstance(node, vy_ast.BinOp):
left, right = node.left, node.right
elif isinstance(node, vy_ast.AugAssign):
left, right = node.target, node.value
else:
raise CompilerPanic(
f"Unexpected node type for numeric op: {type(node).__name__}"
)
value_bits = self._bits - (1 if self._is_signed else 0)
# constant folding ensures one of `(left, right)` is never a literal
if isinstance(left, vy_ast.Int):
if left.value >= 2**value_bits:
raise OverflowException(
"Base is too large, calculation will always overflow",
left)
elif left.value < -(2**value_bits):
raise OverflowException(
"Base is too small, calculation will always underflow",
left)
elif isinstance(right, vy_ast.Int):
if right.value < 0:
raise InvalidOperation("Cannot calculate a negative power",
right)
if right.value > value_bits:
raise OverflowException(
"Power is too large, calculation will always overflow",
right)
else:
msg = (
"Cannot apply an overflow check on exponentiation when both "
"the base and power are unknown at compile-time.")
if not self._is_signed:
msg = (
f"{msg} To perform this operation without an overflow check, use "
f"`pow_mod256({left.node_source_code}, {right.node_source_code})`"
)
raise InvalidOperation(msg, node)
def _validate_numeric_bounds(node: Union["BinOp", "UnaryOp"],
value: Union[decimal.Decimal, int]) -> None:
if isinstance(value, decimal.Decimal):
lower, upper = SizeLimits.MIN_INT128, SizeLimits.MAX_INT128
elif isinstance(value, int):
lower, upper = SizeLimits.MIN_INT256, SizeLimits.MAX_UINT256
else:
raise CompilerPanic(
f"Unexpected return type from {node._op}: {type(value)}")
if not lower <= value <= upper:
raise OverflowException(
f"Result of {node.op.description} ({value}) is outside bounds of all numeric types",
node,
)
def types_from_Constant(self, node):
# literal value (integer, string, etc)
types_list = []
for primitive in types.get_primitive_types().values():
try:
obj = primitive.from_literal(node)
types_list.append(obj)
except VyperException:
continue
if types_list:
return types_list
if isinstance(node, vy_ast.Num):
raise OverflowException(
"Numeric literal is outside of allowable range for number types", node,
)
raise InvalidLiteral(f"Could not determine type for literal value '{node.value}'", node)