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import dataclasses
from formatting import Formatter
import lexer as lx
import parsing
from typing import AbstractSet
NON_ESCAPING_FUNCTIONS = (
"Py_INCREF",
"_PyDictOrValues_IsValues",
"_PyObject_DictOrValuesPointer",
"_PyDictOrValues_GetValues",
"_PyObject_MakeInstanceAttributesFromDict",
"Py_DECREF",
"_Py_DECREF_SPECIALIZED",
"DECREF_INPUTS_AND_REUSE_FLOAT",
"PyUnicode_Append",
"_PyLong_IsZero",
"Py_SIZE",
"Py_TYPE",
"PyList_GET_ITEM",
"PyTuple_GET_ITEM",
"PyList_GET_SIZE",
"PyTuple_GET_SIZE",
"Py_ARRAY_LENGTH",
"Py_Unicode_GET_LENGTH",
"PyUnicode_READ_CHAR",
"_Py_SINGLETON",
"PyUnicode_GET_LENGTH",
"_PyLong_IsCompact",
"_PyLong_IsNonNegativeCompact",
"_PyLong_CompactValue",
"_Py_NewRef",
"_Py_IsImmortal",
"_Py_STR",
"_PyLong_Add",
"_PyLong_Multiply",
"_PyLong_Subtract",
"Py_NewRef",
"_PyList_ITEMS",
"_PyTuple_ITEMS",
"_PyList_AppendTakeRef",
"_Py_atomic_load_uintptr_relaxed",
"_PyFrame_GetCode",
"_PyThreadState_HasStackSpace",
)
ESCAPING_FUNCTIONS = (
"import_name",
"import_from",
)
def makes_escaping_api_call(instr: parsing.InstDef) -> bool:
if "CALL_INTRINSIC" in instr.name:
return True
tkns = iter(instr.tokens)
for tkn in tkns:
if tkn.kind != lx.IDENTIFIER:
continue
try:
next_tkn = next(tkns)
except StopIteration:
return False
if next_tkn.kind != lx.LPAREN:
continue
if tkn.text in ESCAPING_FUNCTIONS:
return True
if not tkn.text.startswith("Py") and not tkn.text.startswith("_Py"):
continue
if tkn.text.endswith("Check"):
continue
if tkn.text.startswith("Py_Is"):
continue
if tkn.text.endswith("CheckExact"):
continue
if tkn.text in NON_ESCAPING_FUNCTIONS:
continue
return True
return False
@dataclasses.dataclass
class InstructionFlags:
"""Construct and manipulate instruction flags"""
HAS_ARG_FLAG: bool = False
HAS_CONST_FLAG: bool = False
HAS_NAME_FLAG: bool = False
HAS_JUMP_FLAG: bool = False
HAS_FREE_FLAG: bool = False
HAS_LOCAL_FLAG: bool = False
HAS_EVAL_BREAK_FLAG: bool = False
HAS_DEOPT_FLAG: bool = False
HAS_ERROR_FLAG: bool = False
HAS_ESCAPES_FLAG: bool = False
def __post_init__(self) -> None:
self.bitmask = {name: (1 << i) for i, name in enumerate(self.names())}
@staticmethod
def fromInstruction(instr: parsing.InstDef) -> "InstructionFlags":
has_free = (
variable_used(instr, "PyCell_New")
or variable_used(instr, "PyCell_GET")
or variable_used(instr, "PyCell_SET")
)
return InstructionFlags(
HAS_ARG_FLAG=variable_used(instr, "oparg"),
HAS_CONST_FLAG=variable_used(instr, "FRAME_CO_CONSTS"),
HAS_NAME_FLAG=variable_used(instr, "FRAME_CO_NAMES"),
HAS_JUMP_FLAG=variable_used(instr, "JUMPBY"),
HAS_FREE_FLAG=has_free,
HAS_LOCAL_FLAG=(
variable_used(instr, "GETLOCAL") or variable_used(instr, "SETLOCAL")
)
and not has_free,
HAS_EVAL_BREAK_FLAG=variable_used(instr, "CHECK_EVAL_BREAKER"),
HAS_DEOPT_FLAG=variable_used(instr, "DEOPT_IF"),
HAS_ERROR_FLAG=(
variable_used(instr, "ERROR_IF")
or variable_used(instr, "error")
or variable_used(instr, "pop_1_error")
or variable_used(instr, "exception_unwind")
or variable_used(instr, "resume_with_error")
),
HAS_ESCAPES_FLAG=makes_escaping_api_call(instr),
)
@staticmethod
def newEmpty() -> "InstructionFlags":
return InstructionFlags()
def add(self, other: "InstructionFlags") -> None:
for name, value in dataclasses.asdict(other).items():
if value:
setattr(self, name, value)
def names(self, value: bool | None = None) -> list[str]:
if value is None:
return list(dataclasses.asdict(self).keys())
return [n for n, v in dataclasses.asdict(self).items() if v == value]
def bitmap(self, ignore: AbstractSet[str] = frozenset()) -> int:
flags = 0
assert all(hasattr(self, name) for name in ignore)
for name in self.names():
if getattr(self, name) and name not in ignore:
flags |= self.bitmask[name]
return flags
@classmethod
def emit_macros(cls, out: Formatter) -> None:
flags = cls.newEmpty()
for name, value in flags.bitmask.items():
out.emit(f"#define {name} ({value})")
for name, value in flags.bitmask.items():
out.emit(
f"#define OPCODE_{name[:-len('_FLAG')]}(OP) "
f"(_PyOpcode_opcode_metadata[OP].flags & ({name}))"
)
def variable_used(node: parsing.Node, name: str) -> bool:
"""Determine whether a variable with a given name is used in a node."""
return any(
token.kind == "IDENTIFIER" and token.text == name for token in node.tokens
)
def variable_used_unspecialized(node: parsing.Node, name: str) -> bool:
"""Like variable_used(), but skips #if ENABLE_SPECIALIZATION blocks."""
tokens: list[lx.Token] = []
skipping = False
for i, token in enumerate(node.tokens):
if token.kind == "CMACRO":
text = "".join(token.text.split())
# TODO: Handle nested #if
if text == "#if":
if i + 1 < len(node.tokens) and node.tokens[i + 1].text in (
"ENABLE_SPECIALIZATION",
"TIER_ONE",
):
skipping = True
elif text in ("#else", "#endif"):
skipping = False
if not skipping:
tokens.append(token)
return any(token.kind == "IDENTIFIER" and token.text == name for token in tokens)
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