diff options
Diffstat (limited to 'Python/import.c')
| -rw-r--r-- | Python/import.c | 126 |
1 files changed, 6 insertions, 120 deletions
diff --git a/Python/import.c b/Python/import.c index 1592045..8dd285f 100644 --- a/Python/import.c +++ b/Python/import.c @@ -27,97 +27,7 @@ typedef unsigned short mode_t; #endif -/* Magic word to reject .pyc files generated by other Python versions. - It should change for each incompatible change to the bytecode. - - The value of CR and LF is incorporated so if you ever read or write - a .pyc file in text mode the magic number will be wrong; also, the - Apple MPW compiler swaps their values, botching string constants. - - The magic numbers must be spaced apart at least 2 values, as the - -U interpeter flag will cause MAGIC+1 being used. They have been - odd numbers for some time now. - - There were a variety of old schemes for setting the magic number. - The current working scheme is to increment the previous value by - 10. - - Starting with the adoption of PEP 3147 in Python 3.2, every bump in magic - number also includes a new "magic tag", i.e. a human readable string used - to represent the magic number in __pycache__ directories. When you change - the magic number, you must also set a new unique magic tag. Generally this - can be named after the Python major version of the magic number bump, but - it can really be anything, as long as it's different than anything else - that's come before. The tags are included in the following table, starting - with Python 3.2a0. - - Known values: - Python 1.5: 20121 - Python 1.5.1: 20121 - Python 1.5.2: 20121 - Python 1.6: 50428 - Python 2.0: 50823 - Python 2.0.1: 50823 - Python 2.1: 60202 - Python 2.1.1: 60202 - Python 2.1.2: 60202 - Python 2.2: 60717 - Python 2.3a0: 62011 - Python 2.3a0: 62021 - Python 2.3a0: 62011 (!) - Python 2.4a0: 62041 - Python 2.4a3: 62051 - Python 2.4b1: 62061 - Python 2.5a0: 62071 - Python 2.5a0: 62081 (ast-branch) - Python 2.5a0: 62091 (with) - Python 2.5a0: 62092 (changed WITH_CLEANUP opcode) - Python 2.5b3: 62101 (fix wrong code: for x, in ...) - Python 2.5b3: 62111 (fix wrong code: x += yield) - Python 2.5c1: 62121 (fix wrong lnotab with for loops and - storing constants that should have been removed) - Python 2.5c2: 62131 (fix wrong code: for x, in ... in listcomp/genexp) - Python 2.6a0: 62151 (peephole optimizations and STORE_MAP opcode) - Python 2.6a1: 62161 (WITH_CLEANUP optimization) - Python 3000: 3000 - 3010 (removed UNARY_CONVERT) - 3020 (added BUILD_SET) - 3030 (added keyword-only parameters) - 3040 (added signature annotations) - 3050 (print becomes a function) - 3060 (PEP 3115 metaclass syntax) - 3061 (string literals become unicode) - 3071 (PEP 3109 raise changes) - 3081 (PEP 3137 make __file__ and __name__ unicode) - 3091 (kill str8 interning) - 3101 (merge from 2.6a0, see 62151) - 3103 (__file__ points to source file) - Python 3.0a4: 3111 (WITH_CLEANUP optimization). - Python 3.0a5: 3131 (lexical exception stacking, including POP_EXCEPT) - Python 3.1a0: 3141 (optimize list, set and dict comprehensions: - change LIST_APPEND and SET_ADD, add MAP_ADD) - Python 3.1a0: 3151 (optimize conditional branches: - introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE) - Python 3.2a0: 3160 (add SETUP_WITH) - tag: cpython-32 - Python 3.2a1: 3170 (add DUP_TOP_TWO, remove DUP_TOPX and ROT_FOUR) - tag: cpython-32 - Python 3.2a2 3180 (add DELETE_DEREF) - Python 3.3a0 3190 __class__ super closure changed - Python 3.3a0 3200 (__qualname__ added) - 3210 (added size modulo 2**32 to the pyc header) - Python 3.3a1 3220 (changed PEP 380 implementation) - Python 3.3a4 3230 (revert changes to implicit __class__ closure) -*/ - -/* MAGIC must change whenever the bytecode emitted by the compiler may no - longer be understood by older implementations of the eval loop (usually - due to the addition of new opcodes) -*/ -#define MAGIC (3230 | ((long)'\r'<<16) | ((long)'\n'<<24)) #define CACHEDIR "__pycache__" -/* Current magic word as global. */ -static long pyc_magic = MAGIC; /* See _PyImport_FixupExtensionObject() below */ static PyObject *extensions = NULL; @@ -516,7 +426,12 @@ PyImport_Cleanup(void) long PyImport_GetMagicNumber(void) { - return pyc_magic; + PyInterpreterState *interp = PyThreadState_Get()->interp; + PyObject *pyc_magic = PyObject_GetAttrString(interp->importlib, + "_RAW_MAGIC_NUMBER"); + if (pyc_magic == NULL) + return -1; + return PyLong_AsLong(pyc_magic); } @@ -1879,30 +1794,6 @@ PyImport_Import(PyObject *module_name) return r; } - -/* Module 'imp' provides Python access to the primitives used for - importing modules. -*/ - -static PyObject * -imp_make_magic(long magic) -{ - char buf[4]; - - buf[0] = (char) ((magic >> 0) & 0xff); - buf[1] = (char) ((magic >> 8) & 0xff); - buf[2] = (char) ((magic >> 16) & 0xff); - buf[3] = (char) ((magic >> 24) & 0xff); - - return PyBytes_FromStringAndSize(buf, 4); -} - -static PyObject * -imp_get_magic(PyObject *self, PyObject *noargs) -{ - return imp_make_magic(pyc_magic); -} - static PyObject * imp_extension_suffixes(PyObject *self, PyObject *noargs) { @@ -2049,10 +1940,6 @@ imp_load_dynamic(PyObject *self, PyObject *args) PyDoc_STRVAR(doc_imp, "(Extremely) low-level import machinery bits as used by importlib and imp."); -PyDoc_STRVAR(doc_get_magic, -"get_magic() -> string\n\ -Return the magic number for .pyc or .pyo files."); - PyDoc_STRVAR(doc_extension_suffixes, "extension_suffixes() -> list of strings\n\ Returns the list of file suffixes used to identify extension modules."); @@ -2075,7 +1962,6 @@ Release the interpreter's import lock.\n\ On platforms without threads, this function does nothing."); static PyMethodDef imp_methods[] = { - {"get_magic", imp_get_magic, METH_NOARGS, doc_get_magic}, {"extension_suffixes", imp_extension_suffixes, METH_NOARGS, doc_extension_suffixes}, {"lock_held", imp_lock_held, METH_NOARGS, doc_lock_held}, |