functions.py 文件源码

def raw_log(expr, args, kwargs, context):
    if not isinstance(args[0], ast.List) or len(args[0].elts) > 4:
        raise StructureException("Expecting a list of 0-4 topics as first argument", args[0])
    topics = []
    for elt in args[0].elts:
        arg = Expr.parse_value_expr(elt, context)
        if not is_base_type(arg.typ, 'bytes32'):
            raise TypeMismatchException("Expecting a bytes32 argument as topic", elt)
        topics.append(arg)
    if args[1].location == "memory":
        return LLLnode.from_list(["with", "_arr", args[1], ["log" + str(len(topics)), ["add", "_arr", 32], ["mload", "_arr"]] + topics],
                                 typ=None, pos=getpos(expr))
    placeholder = context.new_placeholder(args[1].typ)
    placeholder_node = LLLnode.from_list(placeholder, typ=args[1].typ, location='memory')
    copier = make_byte_array_copier(placeholder_node, LLLnode.from_list('_sub', typ=args[1].typ, location=args[1].location))
    return LLLnode.from_list(
        ["with", "_sub", args[1],
            ["seq",
                copier,
                ["log" + str(len(topics)), ["add", placeholder_node, 32], ["mload", placeholder_node]] + topics]],
    typ=None, pos=getpos(expr))