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parser.py
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parser.py
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import ast
from viper.exceptions import (
InvalidLiteralException,
StructureException,
TypeMismatchException,
VariableDeclarationException,
)
from viper.function_signature import (
FunctionSignature,
VariableRecord,
)
from viper.signatures.event_signature import (
EventSignature
)
from .stmt import Stmt
from .expr import Expr
from .parser_utils import LLLnode
from .parser_utils import (
get_length,
getpos,
make_byte_array_copier,
add_variable_offset,
base_type_conversion,
unwrap_location,
byte_array_to_num,
)
from viper.types import (
BaseType,
ByteArrayType,
ListType,
MappingType,
NullType,
StructType,
TupleType,
)
from viper.types import (
get_size_of_type,
is_base_type,
parse_type,
)
from viper.utils import (
MemoryPositions,
LOADED_LIMIT_MAP,
reserved_words,
string_to_bytes
)
from viper.utils import (
bytes_to_int,
calc_mem_gas,
is_varname_valid,
)
if not hasattr(ast, 'AnnAssign'):
raise Exception("Requires python 3.6 or higher for annotation support")
# Converts code to parse tree
def parse(code):
o = ast.parse(code)
decorate_ast_with_source(o, code)
o = resolve_negative_literals(o)
return o.body
# Parser for a single line
def parse_line(code):
o = ast.parse(code).body[0]
decorate_ast_with_source(o, code)
o = resolve_negative_literals(o)
return o
# Decorate every node of an AST tree with the original source code.
# This is necessary to facilitate error pretty-printing.
def decorate_ast_with_source(_ast, code):
class MyVisitor(ast.NodeVisitor):
def visit(self, node):
self.generic_visit(node)
node.source_code = code
MyVisitor().visit(_ast)
def resolve_negative_literals(_ast):
class RewriteUnaryOp(ast.NodeTransformer):
def visit_UnaryOp(self, node):
if isinstance(node.op, ast.USub) and isinstance(node.operand, ast.Num):
node.operand.n = 0 - node.operand.n
return node.operand
else:
return node
return RewriteUnaryOp().visit(_ast)
# Make a getter for a variable. This function gives an output that
# contains lists of 4-tuples:
# (i) the tail of the function name for the getter
# (ii) the code for the arguments that the function takes
# (iii) the code for the return
# (iv) the output type
#
# Here is an example:
#
# Input: my_variable: {foo: num, bar: decimal[5]}
#
# Output:
#
# [('__foo', '', '.foo', 'num'),
# ('__bar', 'arg0: num, ', '.bar[arg0]', 'decimal')]
#
# The getters will have code:
# def get_my_variable__foo() -> num: return self.foo
# def get_my_variable__bar(arg0: nun) -> decimal: return self.bar[arg0]
def _mk_getter_helper(typ, depth=0):
# Base type and byte array type: do not extend the getter function
# name, add no input arguments, add nothing to the return statement,
# output type is the base type
if isinstance(typ, BaseType):
return [("", "", "", repr(typ))]
elif isinstance(typ, ByteArrayType):
return [("", "", "", repr(typ))]
# List type: do not extend the getter name, add an input argument for
# the index in the list, add an item access to the return statement
elif isinstance(typ, ListType):
o = []
for funname, head, tail, base in _mk_getter_helper(typ.subtype, depth + 1):
o.append((funname, ("arg%d: num, " % depth) + head, ("[arg%d]" % depth) + tail, base))
return o
# Mapping type: do not extend the getter name, add an input argument for
# the key in the map, add a value access to the return statement
elif isinstance(typ, MappingType):
o = []
for funname, head, tail, base in _mk_getter_helper(typ.valuetype, depth + 1):
o.append((funname, ("arg%d: %r, " % (depth, typ.keytype)) + head, ("[arg%d]" % depth) + tail, base))
return o
# Struct type: for each member variable, make a separate getter, extend
# its function name with the name of the variable, do not add input
# arguments, add a member access to the return statement
elif isinstance(typ, StructType):
o = []
for k, v in typ.members.items():
for funname, head, tail, base in _mk_getter_helper(v, depth):
o.append(("__" + k + funname, head, "." + k + tail, base))
return o
else:
raise Exception("Unexpected type")
# Make a list of getters for a given variable name with a given type
def mk_getter(varname, typ):
funs = _mk_getter_helper(typ)
return ['@constant\ndef get_%s%s(%s) -> %s: return self.%s%s' % (varname, funname, head.rstrip(', '), base, varname, tail)
for (funname, head, tail, base) in funs]
def add_contract(code):
_defs = []
for item in code:
# Function definitions
if isinstance(item, ast.FunctionDef):
_defs.append(item)
else:
raise StructureException("Invalid contract reference", item)
return _defs
def add_globals_and_events(_defs, _events, _getters, _globals, item):
if item.value is not None:
raise StructureException('May not assign value whilst defining type', item)
elif isinstance(item.annotation, ast.Call) and item.annotation.func.id == "__log__":
if _globals or len(_defs):
raise StructureException("Events must all come before global declarations and function definitions", item)
_events.append(item)
elif not isinstance(item.target, ast.Name):
raise StructureException("Can only assign type to variable in top-level statement", item)
# Check if variable name is reserved or invalid
elif not is_varname_valid(item.target.id):
raise VariableDeclarationException("Variable name invalid or reserved: ", item.target)
# Check if global already exists, if so error
elif item.target.id in _globals:
raise VariableDeclarationException("Cannot declare a persistent variable twice!", item.target)
elif len(_defs):
raise StructureException("Global variables must all come before function definitions", item)
# If the type declaration is of the form public(<type here>), then proceed with
# the underlying type but also add getters
elif isinstance(item.annotation, ast.Call) and item.annotation.func.id == "public":
if len(item.annotation.args) != 1:
raise StructureException("Public expects one arg (the type)")
typ = parse_type(item.annotation.args[0], 'storage')
_globals[item.target.id] = VariableRecord(item.target.id, len(_globals), typ, True)
# Adding getters here
for getter in mk_getter(item.target.id, typ):
_getters.append(parse_line('\n' * (item.lineno - 1) + getter))
_getters[-1].pos = getpos(item)
else:
_globals[item.target.id] = VariableRecord(item.target.id, len(_globals), parse_type(item.annotation, 'storage'), True)
return _events, _globals, _getters
# Parse top-level functions and variables
def get_contracts_and_defs_and_globals(code):
_contracts = {}
_events = []
_globals = {}
_defs = []
_getters = []
for item in code:
# Contract references
if isinstance(item, ast.ClassDef):
if _events or _globals or _defs:
raise StructureException("External contract declarations must come before event declarations, global declarations, and function definitions", item)
_contracts[item.name] = add_contract(item.body)
# Statements of the form:
# variable_name: type
elif isinstance(item, ast.AnnAssign):
_events, _globals, _getters = add_globals_and_events(_defs, _events, _getters, _globals, item)
# Function definitions
elif isinstance(item, ast.FunctionDef):
_defs.append(item)
else:
raise StructureException("Invalid top-level statement", item)
return _contracts, _events, _defs + _getters, _globals
# Header code
initializer_list = ['seq', ['mstore', 28, ['calldataload', 0]]]
# Store limit constants at fixed addresses in memory.
initializer_list += [['mstore', pos, limit_size] for pos, limit_size in LOADED_LIMIT_MAP.items()]
initializer_lll = LLLnode.from_list(initializer_list, typ=None)
# Contains arguments, variables, etc
class Context():
def __init__(self, vars=None, globals=None, sigs=None, forvars=None, return_type=None, is_constant=False, is_payable=False, origcode=''):
# In-memory variables, in the form (name, memory location, type)
self.vars = vars or {}
self.next_mem = MemoryPositions.RESERVED_MEMORY
# Global variables, in the form (name, storage location, type)
self.globals = globals or {}
# ABI objects, in the form {classname: ABI JSON}
self.sigs = sigs or {}
# Variables defined in for loops, eg. for i in range(6): ...
self.forvars = forvars or {}
# Return type of the function
self.return_type = return_type
# Is the function constant?
self.is_constant = is_constant
# Is the function payable?
self.is_payable = is_payable
# Number of placeholders generated (used to generate random names)
self.placeholder_count = 1
# Original code (for error pretty-printing purposes)
self.origcode = origcode
# In Loop status. Wether body is currently evaluating within a for-loop or not.
self.in_for_loop = set()
def set_in_for_loop(self, name_of_list):
self.in_for_loop.add(name_of_list)
def remove_in_for_loop(self, name_of_list):
self.in_for_loop.remove(name_of_list)
# Add a new variable
def new_variable(self, name, typ):
if not is_varname_valid(name):
raise VariableDeclarationException("Variable name invalid or reserved: " + name)
if name in self.vars or name in self.globals:
raise VariableDeclarationException("Duplicate variable name: %s" % name)
self.vars[name] = VariableRecord(name, self.next_mem, typ, True)
pos = self.next_mem
self.next_mem += 32 * get_size_of_type(typ)
return pos
# Add an anonymous variable (used in some complex function definitions)
def new_placeholder(self, typ):
name = '_placeholder_' + str(self.placeholder_count)
self.placeholder_count += 1
return self.new_variable(name, typ)
# Get the next unused memory location
def get_next_mem(self):
return self.next_mem
# Is a function the initializer?
def is_initializer(code):
return code.name == '__init__'
# Get ABI signature
def mk_full_signature(code):
o = []
_contracts, _events, _defs, _globals = get_contracts_and_defs_and_globals(code)
for code in _events:
sig = EventSignature.from_declaration(code)
o.append(sig.to_abi_dict())
for code in _defs:
sig = FunctionSignature.from_definition(code)
if not sig.internal:
o.append(sig.to_abi_dict())
return o
def parse_events(sigs, _events):
for event in _events:
sigs[event.target.id] = EventSignature.from_declaration(event)
return sigs
def parse_external_contracts(external_contracts, _contracts):
for _contractname in _contracts:
_contract_defs = _contracts[_contractname]
_defnames = [_def.name for _def in _contract_defs]
contract = {}
if len(set(_defnames)) < len(_contract_defs):
raise VariableDeclarationException("Duplicate function name: %s" % [name for name in _defnames if _defnames.count(name) > 1][0])
for _def in _contract_defs:
sig = FunctionSignature.from_definition(_def)
contract[sig.name] = sig
external_contracts[_contractname] = contract
return external_contracts
def parse_other_functions(o, otherfuncs, _globals, sigs, external_contracts, origcode):
sub = ['seq', initializer_lll]
add_gas = initializer_lll.gas
for _def in otherfuncs:
sub.append(parse_func(_def, _globals, {**{'self': sigs}, **external_contracts}, origcode))
sub[-1].total_gas += add_gas
add_gas += 30
sig = FunctionSignature.from_definition(_def)
sig.gas = sub[-1].total_gas
sigs[sig.name] = sig
o.append(['return', 0, ['lll', sub, 0]])
return o
# Main python parse tree => LLL method
def parse_tree_to_lll(code, origcode):
_contracts, _events, _defs, _globals = get_contracts_and_defs_and_globals(code)
_names = [_def.name for _def in _defs] + [_event.target.id for _event in _events]
# Checks for duplicate funciton / event names
if len(set(_names)) < len(_names):
raise VariableDeclarationException("Duplicate function or event name: %s" % [name for name in _names if _names.count(name) > 1][0])
# Initialization function
initfunc = [_def for _def in _defs if is_initializer(_def)]
# Regular functions
otherfuncs = [_def for _def in _defs if not is_initializer(_def)]
sigs = {}
external_contracts = {}
# Create the main statement
o = ['seq']
if _events:
sigs = parse_events(sigs, _events)
if _contracts:
external_contracts = parse_external_contracts(external_contracts, _contracts)
# If there is an init func...
if initfunc:
o.append(['seq', initializer_lll])
o.append(parse_func(initfunc[0], _globals, {**{'self': sigs}, **external_contracts}, origcode))
# If there are regular functions...
if otherfuncs:
o = parse_other_functions(o, otherfuncs, _globals, sigs, external_contracts, origcode)
return LLLnode.from_list(o, typ=None)
# Checks that an input matches its type
def make_clamper(datapos, mempos, typ, is_init=False):
if not is_init:
data_decl = ['calldataload', ['add', 4, datapos]]
copier = lambda pos, sz: ['calldatacopy', mempos, ['add', 4, pos], sz]
else:
data_decl = ['codeload', ['add', '~codelen', datapos]]
copier = lambda pos, sz: ['codecopy', mempos, ['add', '~codelen', pos], sz]
# Numbers: make sure they're in range
if is_base_type(typ, 'num'):
return LLLnode.from_list(['clamp', ['mload', MemoryPositions.MINNUM], data_decl, ['mload', MemoryPositions.MAXNUM]],
typ=typ, annotation='checking num input')
# Booleans: make sure they're zero or one
elif is_base_type(typ, 'bool'):
return LLLnode.from_list(['uclamplt', data_decl, 2], typ=typ, annotation='checking bool input')
# Addresses: make sure they're in range
elif is_base_type(typ, 'address'):
return LLLnode.from_list(['uclamplt', data_decl, ['mload', MemoryPositions.ADDRSIZE]], typ=typ, annotation='checking address input')
# Bytes: make sure they have the right size
elif isinstance(typ, ByteArrayType):
return LLLnode.from_list(['seq',
copier(data_decl, 32 + typ.maxlen),
['assert', ['le', ['calldataload', ['add', 4, data_decl]], typ.maxlen]]],
typ=None, annotation='checking bytearray input')
# Lists: recurse
elif isinstance(typ, ListType):
o = []
for i in range(typ.count):
offset = get_size_of_type(typ.subtype) * 32 * i
o.append(make_clamper(datapos + offset, mempos + offset, typ.subtype, is_init))
return LLLnode.from_list(['seq'] + o, typ=None, annotation='checking list input')
# Otherwise don't make any checks
else:
return LLLnode.from_list('pass')
# Parses a function declaration
def parse_func(code, _globals, sigs, origcode, _vars=None):
if _vars is None:
_vars = {}
sig = FunctionSignature.from_definition(code)
# Check for duplicate variables with globals
for arg in sig.args:
if arg.name in _globals:
raise VariableDeclarationException("Variable name duplicated between function arguments and globals: " + arg.name)
# Create a context
context = Context(vars=_vars, globals=_globals, sigs=sigs,
return_type=sig.output_type, is_constant=sig.const, is_payable=sig.payable, origcode=origcode)
# Copy calldata to memory for fixed-size arguments
copy_size = sum([32 if isinstance(arg.typ, ByteArrayType) else get_size_of_type(arg.typ) * 32 for arg in sig.args])
context.next_mem += copy_size
if not len(sig.args):
copier = 'pass'
elif sig.name == '__init__':
copier = ['codecopy', MemoryPositions.RESERVED_MEMORY, '~codelen', copy_size]
else:
copier = ['calldatacopy', MemoryPositions.RESERVED_MEMORY, 4, copy_size]
clampers = [copier]
# Add asserts for payable and internal
if not sig.payable:
clampers.append(['assert', ['iszero', 'callvalue']])
if sig.internal:
clampers.append(['assert', ['eq', 'caller', 'address']])
# Fill in variable positions
for arg in sig.args:
clampers.append(make_clamper(arg.pos, context.next_mem, arg.typ, sig.name == '__init__'))
if isinstance(arg.typ, ByteArrayType):
context.vars[arg.name] = VariableRecord(arg.name, context.next_mem, arg.typ, False)
context.next_mem += 32 * get_size_of_type(arg.typ)
else:
context.vars[arg.name] = VariableRecord(arg.name, MemoryPositions.RESERVED_MEMORY + arg.pos, arg.typ, False)
# Create "clampers" (input well-formedness checkers)
# Return function body
if sig.name == '__init__':
o = LLLnode.from_list(['seq'] + clampers + [parse_body(code.body, context)], pos=getpos(code))
else:
method_id_node = LLLnode.from_list(sig.method_id, pos=getpos(code), annotation='%s' % sig.name)
o = LLLnode.from_list(['if',
['eq', ['mload', 0], method_id_node],
['seq'] + clampers + [parse_body(c, context) for c in code.body] + ['stop']
], typ=None, pos=getpos(code))
o.context = context
o.total_gas = o.gas + calc_mem_gas(o.context.next_mem)
o.func_name = sig.name
return o
# Parse a piece of code
def parse_body(code, context):
if not isinstance(code, list):
return parse_stmt(code, context)
o = []
for stmt in code:
o.append(parse_stmt(stmt, context))
return LLLnode.from_list(['seq'] + o, pos=getpos(code[0]) if code else None)
def external_contract_call_stmt(stmt, context):
contract_name = stmt.func.value.func.id
if contract_name not in context.sigs:
raise VariableDeclarationException("Contract not declared yet: %s" % contract_name)
method_name = stmt.func.attr
if method_name not in context.sigs[contract_name]:
raise VariableDeclarationException("Function not declared yet: %s (reminder: "
"function must be declared in the correct contract)" % method_name)
sig = context.sigs[contract_name][method_name]
contract_address = parse_expr(stmt.func.value.args[0], context)
inargs, inargsize = pack_arguments(sig, [parse_expr(arg, context) for arg in stmt.args], context)
sub = ['seq', ['assert', ['extcodesize', ['mload', contract_address]]],
['assert', ['ne', 'address', ['mload', contract_address]]]]
if context.is_constant:
sub.append(['assert', ['staticcall', 'gas', ['mload', contract_address], inargs, inargsize, 0, 0]])
else:
sub.append(['assert', ['call', 'gas', ['mload', contract_address], 0, inargs, inargsize, 0, 0]])
o = LLLnode.from_list(sub, typ=sig.output_type, location='memory', pos=getpos(stmt))
return o
def external_contract_call_expr(expr, context):
contract_name = expr.func.value.func.id
if contract_name not in context.sigs:
raise VariableDeclarationException("Contract not declared yet: %s" % contract_name)
method_name = expr.func.attr
if method_name not in context.sigs[contract_name]:
raise VariableDeclarationException("Function not declared yet: %s (reminder: "
"function must be declared in the correct contract)" % method_name)
sig = context.sigs[contract_name][method_name]
contract_address = parse_expr(expr.func.value.args[0], context)
inargs, inargsize = pack_arguments(sig, [parse_expr(arg, context) for arg in expr.args], context)
output_placeholder = context.new_placeholder(typ=sig.output_type)
if isinstance(sig.output_type, BaseType):
returner = output_placeholder
elif isinstance(sig.output_type, ByteArrayType):
returner = output_placeholder + 32
else:
raise TypeMismatchException("Invalid output type: %r" % sig.output_type, expr)
sub = ['seq', ['assert', ['extcodesize', ['mload', contract_address]]],
['assert', ['ne', 'address', ['mload', contract_address]]]]
if context.is_constant:
sub.append(['assert', ['staticcall', 'gas', ['mload', contract_address], inargs, inargsize,
output_placeholder, get_size_of_type(sig.output_type) * 32]])
else:
sub.append(['assert', ['call', 'gas', ['mload', contract_address], 0, inargs, inargsize,
output_placeholder, get_size_of_type(sig.output_type) * 32]])
sub.extend([0, returner])
o = LLLnode.from_list(sub, typ=sig.output_type, location='memory', pos=getpos(expr))
return o
# Parse an expression
def parse_expr(expr, context):
return Expr(expr, context).lll_node
# Create an x=y statement, where the types may be compound
def make_setter(left, right, location, pos=None):
# Basic types
if isinstance(left.typ, BaseType):
right = base_type_conversion(right, right.typ, left.typ, pos)
if location == 'storage':
return LLLnode.from_list(['sstore', left, right], typ=None)
elif location == 'memory':
return LLLnode.from_list(['mstore', left, right], typ=None)
# Byte arrays
elif isinstance(left.typ, ByteArrayType):
return make_byte_array_copier(left, right)
# Can't copy mappings
elif isinstance(left.typ, MappingType):
raise TypeMismatchException("Cannot copy mappings; can only copy individual elements", pos)
# Arrays
elif isinstance(left.typ, ListType):
# Cannot do something like [a, b, c] = [1, 2, 3]
if left.value == "multi":
raise Exception("Target of set statement must be a single item")
if not isinstance(right.typ, (ListType, NullType)):
raise TypeMismatchException("Setter type mismatch: left side is array, right side is %r" % right.typ, pos)
left_token = LLLnode.from_list('_L', typ=left.typ, location=left.location)
if left.location == "storage":
left = LLLnode.from_list(['sha3_32', left], typ=left.typ, location="storage_prehashed")
left_token.location = "storage_prehashed"
# Type checks
if not isinstance(right.typ, NullType):
if not isinstance(right.typ, ListType):
raise TypeMismatchException("Left side is array, right side is not", pos)
if left.typ.count != right.typ.count:
raise TypeMismatchException("Mismatched number of elements", pos)
# If the right side is a literal
if right.value == "multi":
if len(right.args) != left.typ.count:
raise TypeMismatchException("Mismatched number of elements", pos)
subs = []
for i in range(left.typ.count):
subs.append(make_setter(add_variable_offset(left_token, LLLnode.from_list(i, typ='num')),
right.args[i], location, pos=pos))
return LLLnode.from_list(['with', '_L', left, ['seq'] + subs], typ=None)
# If the right side is a null
elif isinstance(right.typ, NullType):
subs = []
for i in range(left.typ.count):
subs.append(make_setter(add_variable_offset(left_token, LLLnode.from_list(i, typ='num')),
LLLnode.from_list(None, typ=NullType()), location, pos=pos))
return LLLnode.from_list(['with', '_L', left, ['seq'] + subs], typ=None)
# If the right side is a variable
else:
right_token = LLLnode.from_list('_R', typ=right.typ, location=right.location)
subs = []
for i in range(left.typ.count):
subs.append(make_setter(add_variable_offset(left_token, LLLnode.from_list(i, typ='num')),
add_variable_offset(right_token, LLLnode.from_list(i, typ='num')), location, pos=pos))
return LLLnode.from_list(['with', '_L', left, ['with', '_R', right, ['seq'] + subs]], typ=None)
# Structs
elif isinstance(left.typ, (StructType, TupleType)):
if left.value == "multi":
raise Exception("Target of set statement must be a single item")
if not isinstance(right.typ, NullType):
if not isinstance(right.typ, left.typ.__class__):
raise TypeMismatchException("Setter type mismatch: left side is %r, right side is %r" % (left.typ, right.typ), pos)
if isinstance(left.typ, StructType):
for k in left.typ.members:
if k not in right.typ.members:
raise TypeMismatchException("Keys don't match for structs, missing %s" % k, pos)
for k in right.typ.members:
if k not in left.typ.members:
raise TypeMismatchException("Keys don't match for structs, extra %s" % k, pos)
else:
if len(left.typ.members) != len(right.typ.members):
raise TypeMismatchException("Tuple lengths don't match, %d vs %d" % (len(left.typ.members), len(right.typ.members)), pos)
left_token = LLLnode.from_list('_L', typ=left.typ, location=left.location)
if left.location == "storage":
left = LLLnode.from_list(['sha3_32', left], typ=left.typ, location="storage_prehashed")
left_token.location = "storage_prehashed"
if isinstance(left.typ, StructType):
keyz = sorted(list(left.typ.members.keys()))
else:
keyz = list(range(len(left.typ.members)))
# If the right side is a literal
if right.value == "multi":
if len(right.args) != len(keyz):
raise TypeMismatchException("Mismatched number of elements", pos)
subs = []
for i, typ in enumerate(keyz):
subs.append(make_setter(add_variable_offset(left_token, typ), right.args[i], location))
return LLLnode.from_list(['with', '_L', left, ['seq'] + subs], typ=None)
# If the right side is a null
elif isinstance(right.typ, NullType):
subs = []
for typ in keyz:
subs.append(make_setter(add_variable_offset(left_token, typ), LLLnode.from_list(None, typ=NullType()), location, pos=pos))
return LLLnode.from_list(['with', '_L', left, ['seq'] + subs], typ=None)
# If the right side is a variable
else:
right_token = LLLnode.from_list('_R', typ=right.typ, location=right.location)
subs = []
for typ in keyz:
subs.append(make_setter(add_variable_offset(left_token, typ), add_variable_offset(right_token, typ), location, pos=pos))
return LLLnode.from_list(['with', '_L', left, ['with', '_R', right, ['seq'] + subs]], typ=None)
else:
raise Exception("Invalid type for setters")
# Parse a statement (usually one line of code but not always)
def parse_stmt(stmt, context):
return Stmt(stmt, context).lll_node
def pack_logging_topics(event_id, args, topics_types, context):
topics = [event_id]
for pos, typ in enumerate(topics_types):
arg = args[pos]
input = parse_expr(arg, context)
if isinstance(typ, ByteArrayType) and (isinstance(arg, ast.Str) or (isinstance(arg, ast.Name) and arg.id not in reserved_words)):
if input.typ.maxlen > typ.maxlen:
raise TypeMismatchException("Topic input bytes are to big: %r %r" % (input.typ, typ))
if isinstance(arg, ast.Str):
bytez, bytez_length = string_to_bytes(arg.s)
if len(bytez) > 32:
raise InvalidLiteralException("Can only log a maximum of 32 bytes at a time.")
topics.append(bytes_to_int(bytez + b'\x00' * (32 - bytez_length)))
else:
size = context.vars[arg.id].size
topics.append(byte_array_to_num(input, arg, 'num256', size))
else:
input = unwrap_location(input)
input = base_type_conversion(input, input.typ, typ)
topics.append(input)
return topics
def pack_args_by_32(holder, maxlen, arg, typ, context, placeholder):
if isinstance(typ, BaseType):
input = parse_expr(arg, context)
input = base_type_conversion(input, input.typ, typ)
holder.append(LLLnode.from_list(['mstore', placeholder, input], typ=typ, location='memory'))
elif isinstance(typ, ByteArrayType):
bytez = b''
# String literals
if isinstance(arg, ast.Str):
if len(arg.s) > typ.maxlen:
raise TypeMismatchException("Data input bytes are to big: %r %r" % (len(arg.s), typ))
for c in arg.s:
if ord(c) >= 256:
raise InvalidLiteralException("Cannot insert special character %r into byte array" % c)
bytez += bytes([ord(c)])
bytez_length = len(bytez)
if len(bytez) > 32:
raise InvalidLiteralException("Can only log a maximum of 32 bytes at a time.")
holder.append(LLLnode.from_list(['mstore', placeholder, bytes_to_int(bytez + b'\x00' * (32 - bytez_length))], typ=typ, location='memory'))
# Variables
else:
input = parse_expr(arg, context)
if input.typ.maxlen > typ.maxlen:
raise TypeMismatchException("Data input bytes are to big: %r %r" % (input.typ, typ))
if arg.id in context.vars:
size = context.vars[arg.id].size
holder.append(LLLnode.from_list(['mstore', placeholder, byte_array_to_num(parse_expr(arg, context), arg, 'num256', size)], typ=typ, location='memory'))
elif isinstance(typ, ListType):
maxlen += (typ.count - 1) * 32
typ = typ.subtype
holder, maxlen = pack_args_by_32(holder, maxlen, arg.elts[0], typ, context, placeholder)
for j, arg2 in enumerate(arg.elts[1:]):
holder, maxlen = pack_args_by_32(holder, maxlen, arg2, typ, context, context.new_placeholder(BaseType(32)))
return holder, maxlen
# Pack logging data arguments
def pack_logging_data(types, args, context):
# Checks to see if there's any data
if not args:
return ['seq'], 0, 0
holder = ['seq']
maxlen = len(args) * 32
for i, (arg, typ) in enumerate(zip(args, types)):
holder, maxlen = pack_args_by_32(holder, maxlen, arg, typ, context, context.new_placeholder(BaseType(32)))
return holder, maxlen, holder[1].to_list()[1][0]
# Pack function arguments for a call
def pack_arguments(signature, args, context):
placeholder_typ = ByteArrayType(maxlen=sum([get_size_of_type(arg.typ) for arg in signature.args]) * 32 + 32)
placeholder = context.new_placeholder(placeholder_typ)
setters = [['mstore', placeholder, signature.method_id]]
needpos = False
for i, (arg, typ) in enumerate(zip(args, [arg.typ for arg in signature.args])):
if isinstance(typ, BaseType):
setters.append(make_setter(LLLnode.from_list(placeholder + 32 + i * 32, typ=typ), arg, 'memory'))
elif isinstance(typ, ByteArrayType):
setters.append(['mstore', placeholder + 32 + i * 32, '_poz'])
arg_copy = LLLnode.from_list('_s', typ=arg.typ, location=arg.location)
target = LLLnode.from_list(['add', placeholder + 32, '_poz'], typ=typ, location='memory')
setters.append(['with', '_s', arg, ['seq',
make_byte_array_copier(target, arg_copy),
['set', '_poz', ['add', 32, ['add', '_poz', get_length(arg_copy)]]]]])
needpos = True
else:
raise TypeMismatchException("Cannot pack argument of type %r" % typ)
if needpos:
return LLLnode.from_list(['with', '_poz', len(args) * 32, ['seq'] + setters + [placeholder + 28]],
typ=placeholder_typ, location='memory'), \
placeholder_typ.maxlen - 28
else:
return LLLnode.from_list(['seq'] + setters + [placeholder + 28], typ=placeholder_typ, location='memory'), \
placeholder_typ.maxlen - 28
def parse_to_lll(kode):
code = parse(kode)
return parse_tree_to_lll(code, kode)