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parse_public_function.py
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parse_public_function.py
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import ast
from typing import (
Any,
List,
Union,
)
from vyper.exceptions import (
FunctionDeclarationException,
)
from vyper.parser.arg_clamps import (
make_arg_clamper,
)
from vyper.parser.context import (
Context,
VariableRecord,
)
from vyper.parser.expr import (
Expr,
)
from vyper.parser.function_definitions.utils import (
get_default_names_to_set,
get_nonreentrant_lock,
get_sig_statements,
)
from vyper.parser.global_context import (
GlobalContext,
)
from vyper.parser.lll_node import (
LLLnode,
)
from vyper.parser.parser_utils import (
getpos,
make_setter,
)
from vyper.parser.stmt import (
parse_body,
)
from vyper.signatures import (
sig_utils,
)
from vyper.signatures.function_signature import (
FunctionSignature,
)
from vyper.types.types import (
ByteArrayLike,
get_size_of_type,
)
from vyper.utils import (
MemoryPositions,
)
def get_public_arg_copier(total_size: int,
memory_dest: int,
offset: Union[int, List[Any]] = 4) -> List[Any]:
"""
Generate argument copier.
:param total_size: total memory size to copy
:param memory_dest: base memory address to start from
:param offset: starting offset, used for ByteArrays
"""
copier = ['calldatacopy', memory_dest, offset, total_size]
return copier
def validate_public_function(code: ast.FunctionDef,
sig: FunctionSignature,
global_ctx: GlobalContext) -> None:
""" Validate public function definition. """
# __init__ function may not have defaults.
if sig.is_initializer() and sig.total_default_args > 0:
raise FunctionDeclarationException(
"__init__ function may not have default parameters.",
code
)
# Check for duplicate variables with globals
for arg in sig.args:
if arg.name in global_ctx._globals:
raise FunctionDeclarationException(
"Variable name duplicated between "
"function arguments and globals: " + arg.name,
code
)
def parse_public_function(code: ast.FunctionDef,
sig: FunctionSignature,
context: Context) -> List[Any]:
"""
Parse a public function (FuncDef), and produce full function body.
:param sig: the FuntionSignature
:param code: ast of function
:return: full sig compare & function body
"""
validate_public_function(code, sig, context.global_ctx)
# Get nonreentrant lock
nonreentrant_pre, nonreentrant_post = get_nonreentrant_lock(sig, context.global_ctx)
clampers = []
# Generate copiers
copier: List[Any] = ['pass']
if not len(sig.base_args):
copier = ['pass']
elif sig.name == '__init__':
copier = ['codecopy', MemoryPositions.RESERVED_MEMORY, '~codelen', sig.base_copy_size]
context.memory_allocator.increase_memory(sig.max_copy_size)
clampers.append(copier)
# Add asserts for payable and internal
if not sig.payable:
clampers.append(['assert', ['iszero', 'callvalue']])
# Fill variable positions
default_args_start_pos = len(sig.base_args)
for i, arg in enumerate(sig.args):
if i < len(sig.base_args):
clampers.append(make_arg_clamper(
arg.pos,
context.memory_allocator.get_next_memory_position(),
arg.typ,
sig.name == '__init__',
))
if isinstance(arg.typ, ByteArrayLike):
mem_pos, _ = context.memory_allocator.increase_memory(32 * get_size_of_type(arg.typ))
context.vars[arg.name] = VariableRecord(arg.name, mem_pos, arg.typ, False)
else:
if sig.name == '__init__':
context.vars[arg.name] = VariableRecord(
arg.name,
MemoryPositions.RESERVED_MEMORY + arg.pos,
arg.typ,
False,
)
elif i >= default_args_start_pos: # default args need to be allocated in memory.
default_arg_pos, _ = context.memory_allocator.increase_memory(32)
context.vars[arg.name] = VariableRecord(
name=arg.name,
pos=default_arg_pos,
typ=arg.typ,
mutable=False,
)
else:
context.vars[arg.name] = VariableRecord(
name=arg.name,
pos=4 + arg.pos,
typ=arg.typ,
mutable=False,
location='calldata'
)
# Create "clampers" (input well-formedness checkers)
# Return function body
if sig.name == '__init__':
o = LLLnode.from_list(
['seq'] + clampers + [parse_body(code.body, context)], # type: ignore
pos=getpos(code),
)
# Is default function.
elif sig.is_default_func():
if len(sig.args) > 0:
raise FunctionDeclarationException(
'Default function may not receive any arguments.', code
)
o = LLLnode.from_list(
['seq'] + clampers + [parse_body(code.body, context)], # type: ignore
pos=getpos(code),
)
# Is a normal function.
else:
# Function with default parameters.
if sig.total_default_args > 0:
function_routine = f"{sig.name}_{sig.method_id}"
default_sigs = sig_utils.generate_default_arg_sigs(
code, context.sigs, context.global_ctx
)
sig_chain: List[Any] = ['seq']
for default_sig in default_sigs:
sig_compare, _ = get_sig_statements(default_sig, getpos(code))
# Populate unset default variables
set_defaults = []
for arg_name in get_default_names_to_set(sig, default_sig):
value = Expr(sig.default_values[arg_name], context).lll_node
var = context.vars[arg_name]
left = LLLnode.from_list(var.pos, typ=var.typ, location='memory',
pos=getpos(code), mutable=var.mutable)
set_defaults.append(make_setter(left, value, 'memory', pos=getpos(code)))
current_sig_arg_names = {x.name for x in default_sig.args}
base_arg_names = {arg.name for arg in sig.base_args}
copier_arg_count = len(default_sig.args) - len(sig.base_args)
copier_arg_names = list(current_sig_arg_names - base_arg_names)
# Order copier_arg_names, this is very important.
copier_arg_names = [x.name for x in default_sig.args if x.name in copier_arg_names]
# Variables to be populated from calldata/stack.
default_copiers: List[Any] = []
if copier_arg_count > 0:
# Get map of variables in calldata, with thier offsets
offset = 4
calldata_offset_map = {}
for arg in default_sig.args:
calldata_offset_map[arg.name] = offset
offset += (
32
if isinstance(arg.typ, ByteArrayLike)
else get_size_of_type(arg.typ) * 32
)
# Copy default parameters from calldata.
for arg_name in copier_arg_names:
var = context.vars[arg_name]
calldata_offset = calldata_offset_map[arg_name]
# Add clampers.
default_copiers.append(make_arg_clamper(
calldata_offset - 4,
var.pos,
var.typ,
))
# Add copying code.
_offset: Union[int, List[Any]] = calldata_offset
if isinstance(var.typ, ByteArrayLike):
_offset = ['add', 4, ['calldataload', calldata_offset]]
default_copiers.append(get_public_arg_copier(
memory_dest=var.pos,
total_size=var.size * 32,
offset=_offset,
))
default_copiers.append(0) # for over arching seq, POP
sig_chain.append([
'if', sig_compare,
['seq',
['seq'] + set_defaults if set_defaults else ['pass'],
['seq_unchecked'] + default_copiers if default_copiers else ['pass'],
['goto', function_routine]]
])
# Function with default parameters.
o = LLLnode.from_list(
[
'seq',
sig_chain,
[
'if', 0, # can only be jumped into
[
'seq',
['label', function_routine],
['seq'] + nonreentrant_pre + clampers + [
parse_body(c, context)
for c in code.body
] + nonreentrant_post + [['stop']]
],
],
], typ=None, pos=getpos(code))
else:
# Function without default parameters.
sig_compare, _ = get_sig_statements(sig, getpos(code))
o = LLLnode.from_list(
[
'if',
sig_compare,
['seq'] + nonreentrant_pre + clampers + [
parse_body(c, context)
for c
in code.body
] + nonreentrant_post + [['stop']]
], typ=None, pos=getpos(code))
return o