Current File : //usr/lib/python3/dist-packages/mypyc/ir/func_ir.py
"""Intermediate representation of functions."""
from typing import List, Optional, Sequence
from typing_extensions import Final
from mypy.nodes import FuncDef, Block, ArgKind, ARG_POS
from mypyc.common import JsonDict, get_id_from_name, short_id_from_name
from mypyc.ir.ops import (
DeserMaps, BasicBlock, Value, Register, Assign, AssignMulti, ControlOp, LoadAddress
)
from mypyc.ir.rtypes import RType, deserialize_type
from mypyc.namegen import NameGenerator
class RuntimeArg:
"""Description of a function argument in IR.
Argument kind is one of ARG_* constants defined in mypy.nodes.
"""
def __init__(
self, name: str, typ: RType, kind: ArgKind = ARG_POS, pos_only: bool = False) -> None:
self.name = name
self.type = typ
self.kind = kind
self.pos_only = pos_only
@property
def optional(self) -> bool:
return self.kind.is_optional()
def __repr__(self) -> str:
return 'RuntimeArg(name=%s, type=%s, optional=%r, pos_only=%r)' % (
self.name, self.type, self.optional, self.pos_only)
def serialize(self) -> JsonDict:
return {'name': self.name, 'type': self.type.serialize(), 'kind': int(self.kind.value),
'pos_only': self.pos_only}
@classmethod
def deserialize(cls, data: JsonDict, ctx: DeserMaps) -> 'RuntimeArg':
return RuntimeArg(
data['name'],
deserialize_type(data['type'], ctx),
ArgKind(data['kind']),
data['pos_only'],
)
class FuncSignature:
"""Signature of a function in IR."""
# TODO: Track if method?
def __init__(self, args: Sequence[RuntimeArg], ret_type: RType) -> None:
self.args = tuple(args)
self.ret_type = ret_type
def __repr__(self) -> str:
return 'FuncSignature(args=%r, ret=%r)' % (self.args, self.ret_type)
def serialize(self) -> JsonDict:
return {'args': [t.serialize() for t in self.args], 'ret_type': self.ret_type.serialize()}
@classmethod
def deserialize(cls, data: JsonDict, ctx: DeserMaps) -> 'FuncSignature':
return FuncSignature(
[RuntimeArg.deserialize(arg, ctx) for arg in data['args']],
deserialize_type(data['ret_type'], ctx),
)
FUNC_NORMAL: Final = 0
FUNC_STATICMETHOD: Final = 1
FUNC_CLASSMETHOD: Final = 2
class FuncDecl:
"""Declaration of a function in IR (without body or implementation).
A function can be a regular module-level function, a method, a
static method, a class method, or a property getter/setter.
"""
def __init__(self,
name: str,
class_name: Optional[str],
module_name: str,
sig: FuncSignature,
kind: int = FUNC_NORMAL,
is_prop_setter: bool = False,
is_prop_getter: bool = False) -> None:
self.name = name
self.class_name = class_name
self.module_name = module_name
self.sig = sig
self.kind = kind
self.is_prop_setter = is_prop_setter
self.is_prop_getter = is_prop_getter
if class_name is None:
self.bound_sig: Optional[FuncSignature] = None
else:
if kind == FUNC_STATICMETHOD:
self.bound_sig = sig
else:
self.bound_sig = FuncSignature(sig.args[1:], sig.ret_type)
# this is optional because this will be set to the line number when the corresponding
# FuncIR is created
self._line: Optional[int] = None
@property
def line(self) -> int:
assert self._line is not None
return self._line
@line.setter
def line(self, line: int) -> None:
self._line = line
@property
def id(self) -> str:
assert self.line is not None
return get_id_from_name(self.name, self.fullname, self.line)
@staticmethod
def compute_shortname(class_name: Optional[str], name: str) -> str:
return class_name + '.' + name if class_name else name
@property
def shortname(self) -> str:
return FuncDecl.compute_shortname(self.class_name, self.name)
@property
def fullname(self) -> str:
return self.module_name + '.' + self.shortname
def cname(self, names: NameGenerator) -> str:
partial_name = short_id_from_name(self.name, self.shortname, self._line)
return names.private_name(self.module_name, partial_name)
def serialize(self) -> JsonDict:
return {
'name': self.name,
'class_name': self.class_name,
'module_name': self.module_name,
'sig': self.sig.serialize(),
'kind': self.kind,
'is_prop_setter': self.is_prop_setter,
'is_prop_getter': self.is_prop_getter,
}
# TODO: move this to FuncIR?
@staticmethod
def get_id_from_json(func_ir: JsonDict) -> str:
"""Get the id from the serialized FuncIR associated with this FuncDecl"""
decl = func_ir['decl']
shortname = FuncDecl.compute_shortname(decl['class_name'], decl['name'])
fullname = decl['module_name'] + '.' + shortname
return get_id_from_name(decl['name'], fullname, func_ir['line'])
@classmethod
def deserialize(cls, data: JsonDict, ctx: DeserMaps) -> 'FuncDecl':
return FuncDecl(
data['name'],
data['class_name'],
data['module_name'],
FuncSignature.deserialize(data['sig'], ctx),
data['kind'],
data['is_prop_setter'],
data['is_prop_getter'],
)
class FuncIR:
"""Intermediate representation of a function with contextual information.
Unlike FuncDecl, this includes the IR of the body (basic blocks).
"""
def __init__(self,
decl: FuncDecl,
arg_regs: List[Register],
blocks: List[BasicBlock],
line: int = -1,
traceback_name: Optional[str] = None) -> None:
# Declaration of the function, including the signature
self.decl = decl
# Registers for all the arguments to the function
self.arg_regs = arg_regs
# Body of the function
self.blocks = blocks
self.decl.line = line
# The name that should be displayed for tracebacks that
# include this function. Function will be omitted from
# tracebacks if None.
self.traceback_name = traceback_name
@property
def line(self) -> int:
return self.decl.line
@property
def args(self) -> Sequence[RuntimeArg]:
return self.decl.sig.args
@property
def ret_type(self) -> RType:
return self.decl.sig.ret_type
@property
def class_name(self) -> Optional[str]:
return self.decl.class_name
@property
def sig(self) -> FuncSignature:
return self.decl.sig
@property
def name(self) -> str:
return self.decl.name
@property
def fullname(self) -> str:
return self.decl.fullname
@property
def id(self) -> str:
return self.decl.id
def cname(self, names: NameGenerator) -> str:
return self.decl.cname(names)
def __repr__(self) -> str:
if self.class_name:
return '<FuncIR {}.{}>'.format(self.class_name, self.name)
else:
return '<FuncIR {}>'.format(self.name)
def serialize(self) -> JsonDict:
# We don't include blocks in the serialized version
return {
'decl': self.decl.serialize(),
'line': self.line,
'traceback_name': self.traceback_name,
}
@classmethod
def deserialize(cls, data: JsonDict, ctx: DeserMaps) -> 'FuncIR':
return FuncIR(
FuncDecl.deserialize(data['decl'], ctx),
[],
[],
data['line'],
data['traceback_name'],
)
INVALID_FUNC_DEF: Final = FuncDef("<INVALID_FUNC_DEF>", [], Block([]))
def all_values(args: List[Register], blocks: List[BasicBlock]) -> List[Value]:
"""Return the set of all values that may be initialized in the blocks.
This omits registers that are only read.
"""
values: List[Value] = list(args)
seen_registers = set(args)
for block in blocks:
for op in block.ops:
if not isinstance(op, ControlOp):
if isinstance(op, (Assign, AssignMulti)):
if op.dest not in seen_registers:
values.append(op.dest)
seen_registers.add(op.dest)
elif op.is_void:
continue
else:
# If we take the address of a register, it might get initialized.
if (isinstance(op, LoadAddress)
and isinstance(op.src, Register)
and op.src not in seen_registers):
values.append(op.src)
seen_registers.add(op.src)
values.append(op)
return values
def all_values_full(args: List[Register], blocks: List[BasicBlock]) -> List[Value]:
"""Return set of all values that are initialized or accessed."""
values: List[Value] = list(args)
seen_registers = set(args)
for block in blocks:
for op in block.ops:
for source in op.sources():
# Look for uninitialized registers that are accessed. Ignore
# non-registers since we don't allow ops outside basic blocks.
if isinstance(source, Register) and source not in seen_registers:
values.append(source)
seen_registers.add(source)
if not isinstance(op, ControlOp):
if isinstance(op, (Assign, AssignMulti)):
if op.dest not in seen_registers:
values.append(op.dest)
seen_registers.add(op.dest)
elif op.is_void:
continue
else:
values.append(op)
return values
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