mirror of https://github.com/python/cpython
530 lines
20 KiB
Python
530 lines
20 KiB
Python
"""Deep freeze
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The script may be executed by _bootstrap_python interpreter.
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Shared library extension modules are not available in that case.
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On Windows, and in cross-compilation cases, it is executed
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by Python 3.10, and 3.11 features are not available.
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"""
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import argparse
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import builtins
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import collections
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import contextlib
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import os
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import re
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import time
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import types
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from typing import Dict, FrozenSet, TextIO, Tuple
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import umarshal
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ROOT = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
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verbose = False
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# This must be kept in sync with Tools/cases_generator/generate_cases.py
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RESUME = 149
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def isprintable(b: bytes) -> bool:
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return all(0x20 <= c < 0x7f for c in b)
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def make_string_literal(b: bytes) -> str:
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res = ['"']
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if isprintable(b):
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res.append(b.decode("ascii").replace("\\", "\\\\").replace("\"", "\\\""))
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else:
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for i in b:
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res.append(f"\\x{i:02x}")
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res.append('"')
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return "".join(res)
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CO_FAST_LOCAL = 0x20
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CO_FAST_CELL = 0x40
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CO_FAST_FREE = 0x80
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next_code_version = 1
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def get_localsplus(code: types.CodeType):
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a = collections.defaultdict(int)
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for name in code.co_varnames:
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a[name] |= CO_FAST_LOCAL
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for name in code.co_cellvars:
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a[name] |= CO_FAST_CELL
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for name in code.co_freevars:
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a[name] |= CO_FAST_FREE
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return tuple(a.keys()), bytes(a.values())
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def get_localsplus_counts(code: types.CodeType,
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names: Tuple[str, ...],
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kinds: bytes) -> Tuple[int, int, int, int]:
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nlocals = 0
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ncellvars = 0
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nfreevars = 0
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assert len(names) == len(kinds)
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for name, kind in zip(names, kinds):
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if kind & CO_FAST_LOCAL:
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nlocals += 1
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if kind & CO_FAST_CELL:
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ncellvars += 1
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elif kind & CO_FAST_CELL:
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ncellvars += 1
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elif kind & CO_FAST_FREE:
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nfreevars += 1
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assert nlocals == len(code.co_varnames) == code.co_nlocals, \
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(nlocals, len(code.co_varnames), code.co_nlocals)
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assert ncellvars == len(code.co_cellvars)
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assert nfreevars == len(code.co_freevars)
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return nlocals, ncellvars, nfreevars
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PyUnicode_1BYTE_KIND = 1
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PyUnicode_2BYTE_KIND = 2
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PyUnicode_4BYTE_KIND = 4
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def analyze_character_width(s: str) -> Tuple[int, bool]:
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maxchar = ' '
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for c in s:
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maxchar = max(maxchar, c)
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ascii = False
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if maxchar <= '\xFF':
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kind = PyUnicode_1BYTE_KIND
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ascii = maxchar <= '\x7F'
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elif maxchar <= '\uFFFF':
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kind = PyUnicode_2BYTE_KIND
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else:
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kind = PyUnicode_4BYTE_KIND
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return kind, ascii
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def removesuffix(base: str, suffix: str) -> str:
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if base.endswith(suffix):
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return base[:len(base) - len(suffix)]
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return base
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class Printer:
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def __init__(self, file: TextIO) -> None:
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self.level = 0
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self.file = file
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self.cache: Dict[tuple[type, object, str], str] = {}
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self.hits, self.misses = 0, 0
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self.finis: list[str] = []
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self.inits: list[str] = []
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self.identifiers, self.strings = self.get_identifiers_and_strings()
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self.write('#include "Python.h"')
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self.write('#include "internal/pycore_object.h"')
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self.write('#include "internal/pycore_gc.h"')
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self.write('#include "internal/pycore_code.h"')
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self.write('#include "internal/pycore_frame.h"')
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self.write('#include "internal/pycore_long.h"')
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self.write("")
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def get_identifiers_and_strings(self) -> tuple[set[str], dict[str, str]]:
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filename = os.path.join(ROOT, "Include", "internal", "pycore_global_strings.h")
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with open(filename) as fp:
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lines = fp.readlines()
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identifiers: set[str] = set()
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strings: dict[str, str] = {}
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for line in lines:
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if m := re.search(r"STRUCT_FOR_ID\((\w+)\)", line):
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identifiers.add(m.group(1))
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if m := re.search(r'STRUCT_FOR_STR\((\w+), "(.*?)"\)', line):
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strings[m.group(2)] = m.group(1)
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return identifiers, strings
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@contextlib.contextmanager
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def indent(self) -> None:
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save_level = self.level
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try:
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self.level += 1
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yield
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finally:
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self.level = save_level
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def write(self, arg: str) -> None:
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self.file.writelines((" "*self.level, arg, "\n"))
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@contextlib.contextmanager
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def block(self, prefix: str, suffix: str = "") -> None:
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self.write(prefix + " {")
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with self.indent():
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yield
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self.write("}" + suffix)
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def object_head(self, typename: str) -> None:
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self.write(f".ob_base = _PyObject_HEAD_INIT(&{typename}),")
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def object_var_head(self, typename: str, size: int) -> None:
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self.write(f".ob_base = _PyVarObject_HEAD_INIT(&{typename}, {size}),")
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def field(self, obj: object, name: str) -> None:
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self.write(f".{name} = {getattr(obj, name)},")
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def generate_bytes(self, name: str, b: bytes) -> str:
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if b == b"":
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return "(PyObject *)&_Py_SINGLETON(bytes_empty)"
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if len(b) == 1:
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return f"(PyObject *)&_Py_SINGLETON(bytes_characters[{b[0]}])"
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self.write("static")
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with self.indent():
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with self.block("struct"):
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self.write("PyObject_VAR_HEAD")
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self.write("Py_hash_t ob_shash;")
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self.write(f"char ob_sval[{len(b) + 1}];")
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with self.block(f"{name} =", ";"):
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self.object_var_head("PyBytes_Type", len(b))
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self.write(".ob_shash = -1,")
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self.write(f".ob_sval = {make_string_literal(b)},")
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return f"& {name}.ob_base.ob_base"
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def generate_unicode(self, name: str, s: str) -> str:
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if s in self.strings:
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return f"&_Py_STR({self.strings[s]})"
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if s in self.identifiers:
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return f"&_Py_ID({s})"
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if len(s) == 1:
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c = ord(s)
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if c < 128:
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return f"(PyObject *)&_Py_SINGLETON(strings).ascii[{c}]"
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elif c < 256:
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return f"(PyObject *)&_Py_SINGLETON(strings).latin1[{c - 128}]"
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if re.match(r'\A[A-Za-z0-9_]+\Z', s):
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name = f"const_str_{s}"
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kind, ascii = analyze_character_width(s)
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if kind == PyUnicode_1BYTE_KIND:
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datatype = "uint8_t"
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elif kind == PyUnicode_2BYTE_KIND:
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datatype = "uint16_t"
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else:
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datatype = "uint32_t"
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self.write("static")
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with self.indent():
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with self.block("struct"):
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if ascii:
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self.write("PyASCIIObject _ascii;")
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else:
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self.write("PyCompactUnicodeObject _compact;")
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self.write(f"{datatype} _data[{len(s)+1}];")
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with self.block(f"{name} =", ";"):
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if ascii:
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with self.block("._ascii =", ","):
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self.object_head("PyUnicode_Type")
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self.write(f".length = {len(s)},")
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self.write(".hash = -1,")
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with self.block(".state =", ","):
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self.write(".kind = 1,")
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self.write(".compact = 1,")
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self.write(".ascii = 1,")
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self.write(".statically_allocated = 1,")
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self.write(f"._data = {make_string_literal(s.encode('ascii'))},")
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return f"& {name}._ascii.ob_base"
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else:
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with self.block("._compact =", ","):
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with self.block("._base =", ","):
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self.object_head("PyUnicode_Type")
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self.write(f".length = {len(s)},")
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self.write(".hash = -1,")
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with self.block(".state =", ","):
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self.write(f".kind = {kind},")
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self.write(".compact = 1,")
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self.write(".ascii = 0,")
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self.write(".statically_allocated = 1,")
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utf8 = s.encode('utf-8')
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self.write(f'.utf8 = {make_string_literal(utf8)},')
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self.write(f'.utf8_length = {len(utf8)},')
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with self.block(f"._data =", ","):
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for i in range(0, len(s), 16):
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data = s[i:i+16]
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self.write(", ".join(map(str, map(ord, data))) + ",")
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return f"& {name}._compact._base.ob_base"
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def generate_code(self, name: str, code: types.CodeType) -> str:
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global next_code_version
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# The ordering here matches PyCode_NewWithPosOnlyArgs()
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# (but see below).
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co_consts = self.generate(name + "_consts", code.co_consts)
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co_names = self.generate(name + "_names", code.co_names)
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co_filename = self.generate(name + "_filename", code.co_filename)
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co_name = self.generate(name + "_name", code.co_name)
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co_qualname = self.generate(name + "_qualname", code.co_qualname)
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co_linetable = self.generate(name + "_linetable", code.co_linetable)
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co_exceptiontable = self.generate(name + "_exceptiontable", code.co_exceptiontable)
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# These fields are not directly accessible
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localsplusnames, localspluskinds = get_localsplus(code)
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co_localsplusnames = self.generate(name + "_localsplusnames", localsplusnames)
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co_localspluskinds = self.generate(name + "_localspluskinds", localspluskinds)
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# Derived values
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nlocals, ncellvars, nfreevars = \
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get_localsplus_counts(code, localsplusnames, localspluskinds)
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co_code_adaptive = make_string_literal(code.co_code)
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self.write("static")
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with self.indent():
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self.write(f"struct _PyCode_DEF({len(code.co_code)})")
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with self.block(f"{name} =", ";"):
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self.object_var_head("PyCode_Type", len(code.co_code) // 2)
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# But the ordering here must match that in cpython/code.h
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# (which is a pain because we tend to reorder those for perf)
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# otherwise MSVC doesn't like it.
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self.write(f".co_consts = {co_consts},")
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self.write(f".co_names = {co_names},")
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self.write(f".co_exceptiontable = {co_exceptiontable},")
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self.field(code, "co_flags")
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self.field(code, "co_argcount")
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self.field(code, "co_posonlyargcount")
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self.field(code, "co_kwonlyargcount")
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# The following should remain in sync with _PyFrame_NumSlotsForCodeObject
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self.write(f".co_framesize = {code.co_stacksize + len(localsplusnames)} + FRAME_SPECIALS_SIZE,")
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self.field(code, "co_stacksize")
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self.field(code, "co_firstlineno")
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self.write(f".co_nlocalsplus = {len(localsplusnames)},")
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self.field(code, "co_nlocals")
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self.write(f".co_ncellvars = {ncellvars},")
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self.write(f".co_nfreevars = {nfreevars},")
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self.write(f".co_version = {next_code_version},")
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next_code_version += 1
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self.write(f".co_localsplusnames = {co_localsplusnames},")
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self.write(f".co_localspluskinds = {co_localspluskinds},")
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self.write(f".co_filename = {co_filename},")
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self.write(f".co_name = {co_name},")
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self.write(f".co_qualname = {co_qualname},")
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self.write(f".co_linetable = {co_linetable},")
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self.write(f"._co_cached = NULL,")
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self.write(f".co_code_adaptive = {co_code_adaptive},")
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first_traceable = 0
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for op in code.co_code[::2]:
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if op == RESUME:
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break
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first_traceable += 1
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self.write(f"._co_firsttraceable = {first_traceable},")
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name_as_code = f"(PyCodeObject *)&{name}"
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self.finis.append(f"_PyStaticCode_Fini({name_as_code});")
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self.inits.append(f"_PyStaticCode_Init({name_as_code})")
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return f"& {name}.ob_base.ob_base"
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def generate_tuple(self, name: str, t: Tuple[object, ...]) -> str:
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if len(t) == 0:
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return f"(PyObject *)& _Py_SINGLETON(tuple_empty)"
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items = [self.generate(f"{name}_{i}", it) for i, it in enumerate(t)]
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self.write("static")
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with self.indent():
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with self.block("struct"):
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self.write("PyGC_Head _gc_head;")
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with self.block("struct", "_object;"):
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self.write("PyObject_VAR_HEAD")
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if t:
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self.write(f"PyObject *ob_item[{len(t)}];")
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with self.block(f"{name} =", ";"):
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with self.block("._object =", ","):
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self.object_var_head("PyTuple_Type", len(t))
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if items:
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with self.block(f".ob_item =", ","):
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for item in items:
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self.write(item + ",")
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return f"& {name}._object.ob_base.ob_base"
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def _generate_int_for_bits(self, name: str, i: int, digit: int) -> None:
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sign = (i > 0) - (i < 0)
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i = abs(i)
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digits: list[int] = []
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while i:
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i, rem = divmod(i, digit)
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digits.append(rem)
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self.write("static")
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with self.indent():
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with self.block("struct"):
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self.write("PyObject ob_base;")
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self.write("uintptr_t lv_tag;")
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self.write(f"digit ob_digit[{max(1, len(digits))}];")
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with self.block(f"{name} =", ";"):
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self.object_head("PyLong_Type")
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self.write(f".lv_tag = TAG_FROM_SIGN_AND_SIZE({sign}, {len(digits)}),")
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if digits:
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ds = ", ".join(map(str, digits))
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self.write(f".ob_digit = {{ {ds} }},")
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def generate_int(self, name: str, i: int) -> str:
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if -5 <= i <= 256:
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return f"(PyObject *)&_PyLong_SMALL_INTS[_PY_NSMALLNEGINTS + {i}]"
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if i >= 0:
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name = f"const_int_{i}"
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else:
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name = f"const_int_negative_{abs(i)}"
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if abs(i) < 2**15:
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self._generate_int_for_bits(name, i, 2**15)
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else:
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connective = "if"
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for bits_in_digit in 15, 30:
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self.write(f"#{connective} PYLONG_BITS_IN_DIGIT == {bits_in_digit}")
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self._generate_int_for_bits(name, i, 2**bits_in_digit)
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connective = "elif"
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self.write("#else")
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self.write('#error "PYLONG_BITS_IN_DIGIT should be 15 or 30"')
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self.write("#endif")
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# If neither clause applies, it won't compile
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return f"& {name}.ob_base"
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def generate_float(self, name: str, x: float) -> str:
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with self.block(f"static PyFloatObject {name} =", ";"):
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self.object_head("PyFloat_Type")
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self.write(f".ob_fval = {x},")
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return f"&{name}.ob_base"
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def generate_complex(self, name: str, z: complex) -> str:
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with self.block(f"static PyComplexObject {name} =", ";"):
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self.object_head("PyComplex_Type")
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self.write(f".cval = {{ {z.real}, {z.imag} }},")
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return f"&{name}.ob_base"
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def generate_frozenset(self, name: str, fs: FrozenSet[object]) -> str:
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try:
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fs = sorted(fs)
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except TypeError:
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# frozen set with incompatible types, fallback to repr()
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fs = sorted(fs, key=repr)
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ret = self.generate_tuple(name, tuple(fs))
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self.write("// TODO: The above tuple should be a frozenset")
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return ret
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def generate_file(self, module: str, code: object)-> None:
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module = module.replace(".", "_")
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self.generate(f"{module}_toplevel", code)
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self.write(EPILOGUE.format(name=module))
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def generate(self, name: str, obj: object) -> str:
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# Use repr() in the key to distinguish -0.0 from +0.0
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key = (type(obj), obj, repr(obj))
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if key in self.cache:
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self.hits += 1
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# print(f"Cache hit {key!r:.40}: {self.cache[key]!r:.40}")
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return self.cache[key]
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self.misses += 1
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if isinstance(obj, (types.CodeType, umarshal.Code)) :
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val = self.generate_code(name, obj)
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elif isinstance(obj, tuple):
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val = self.generate_tuple(name, obj)
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elif isinstance(obj, str):
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val = self.generate_unicode(name, obj)
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elif isinstance(obj, bytes):
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val = self.generate_bytes(name, obj)
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elif obj is True:
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return "Py_True"
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elif obj is False:
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return "Py_False"
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elif isinstance(obj, int):
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val = self.generate_int(name, obj)
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elif isinstance(obj, float):
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val = self.generate_float(name, obj)
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elif isinstance(obj, complex):
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val = self.generate_complex(name, obj)
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elif isinstance(obj, frozenset):
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val = self.generate_frozenset(name, obj)
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elif obj is builtins.Ellipsis:
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return "Py_Ellipsis"
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elif obj is None:
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return "Py_None"
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else:
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raise TypeError(
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f"Cannot generate code for {type(obj).__name__} object")
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# print(f"Cache store {key!r:.40}: {val!r:.40}")
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self.cache[key] = val
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return val
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EPILOGUE = """
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PyObject *
|
|
_Py_get_{name}_toplevel(void)
|
|
{{
|
|
return Py_NewRef((PyObject *) &{name}_toplevel);
|
|
}}
|
|
"""
|
|
|
|
FROZEN_COMMENT_C = "/* Auto-generated by Programs/_freeze_module.c */"
|
|
FROZEN_COMMENT_PY = "/* Auto-generated by Programs/_freeze_module.py */"
|
|
|
|
FROZEN_DATA_LINE = r"\s*(\d+,\s*)+\s*"
|
|
|
|
|
|
def is_frozen_header(source: str) -> bool:
|
|
return source.startswith((FROZEN_COMMENT_C, FROZEN_COMMENT_PY))
|
|
|
|
|
|
def decode_frozen_data(source: str) -> types.CodeType:
|
|
values: list[int] = []
|
|
for line in source.splitlines():
|
|
if re.match(FROZEN_DATA_LINE, line):
|
|
values.extend([int(x) for x in line.split(",") if x.strip()])
|
|
data = bytes(values)
|
|
return umarshal.loads(data)
|
|
|
|
|
|
def generate(args: list[str], output: TextIO) -> None:
|
|
printer = Printer(output)
|
|
for arg in args:
|
|
file, modname = arg.rsplit(':', 1)
|
|
with open(file, "r", encoding="utf8") as fd:
|
|
source = fd.read()
|
|
if is_frozen_header(source):
|
|
code = decode_frozen_data(source)
|
|
else:
|
|
code = compile(fd.read(), f"<frozen {modname}>", "exec")
|
|
printer.generate_file(modname, code)
|
|
with printer.block(f"void\n_Py_Deepfreeze_Fini(void)"):
|
|
for p in printer.finis:
|
|
printer.write(p)
|
|
with printer.block(f"int\n_Py_Deepfreeze_Init(void)"):
|
|
for p in printer.inits:
|
|
with printer.block(f"if ({p} < 0)"):
|
|
printer.write("return -1;")
|
|
printer.write("return 0;")
|
|
printer.write(f"\nuint32_t _Py_next_func_version = {next_code_version};\n")
|
|
if verbose:
|
|
print(f"Cache hits: {printer.hits}, misses: {printer.misses}")
|
|
|
|
|
|
parser = argparse.ArgumentParser()
|
|
parser.add_argument("-o", "--output", help="Defaults to deepfreeze.c", default="deepfreeze.c")
|
|
parser.add_argument("-v", "--verbose", action="store_true", help="Print diagnostics")
|
|
group = parser.add_mutually_exclusive_group(required=True)
|
|
group.add_argument("-f", "--file", help="read rule lines from a file")
|
|
group.add_argument('args', nargs="*", default=(),
|
|
help="Input file and module name (required) in file:modname format")
|
|
|
|
@contextlib.contextmanager
|
|
def report_time(label: str):
|
|
t0 = time.time()
|
|
try:
|
|
yield
|
|
finally:
|
|
t1 = time.time()
|
|
if verbose:
|
|
print(f"{label}: {t1-t0:.3f} sec")
|
|
|
|
|
|
def main() -> None:
|
|
global verbose
|
|
args = parser.parse_args()
|
|
verbose = args.verbose
|
|
output = args.output
|
|
|
|
if args.file:
|
|
if verbose:
|
|
print(f"Reading targets from {args.file}")
|
|
with open(args.file, "rt", encoding="utf-8-sig") as fin:
|
|
rules = [x.strip() for x in fin]
|
|
else:
|
|
rules = args.args
|
|
|
|
with open(output, "w", encoding="utf-8") as file:
|
|
with report_time("generate"):
|
|
generate(rules, file)
|
|
if verbose:
|
|
print(f"Wrote {os.path.getsize(output)} bytes to {output}")
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|