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The C and C++ Include Header Files

cat -n /usr/include/python3.14/internal/pycore_magic_number.h

     1	#ifndef Py_INTERNAL_MAGIC_NUMBER_H
     2	#define Py_INTERNAL_MAGIC_NUMBER_H
     3	#ifdef __cplusplus
     4	extern "C" {
     5	#endif
     6	
     7	#ifndef Py_BUILD_CORE
     8	#  error "this header requires Py_BUILD_CORE define"
     9	#endif
    10	
    11	/*
    12	
    13	Magic number to reject .pyc files generated by other Python versions.
    14	It should change for each incompatible change to the bytecode.
    15	
    16	PYC_MAGIC_NUMBER must change whenever the bytecode emitted by the compiler may
    17	no longer be understood by older implementations of the eval loop (usually due
    18	to the addition of new opcodes).
    19	
    20	The value of CR and LF is incorporated so if you ever read or write
    21	a .pyc file in text mode the magic number will be wrong; also, the
    22	Apple MPW compiler swaps their values, botching string constants.
    23	
    24	There were a variety of old schemes for setting the magic number. Starting with
    25	Python 3.11, Python 3.n starts with magic number 2900+50n. Within each minor
    26	version, the magic number is incremented by 1 each time the file format changes.
    27	
    28	Known values:
    29	 Python 1.5:   20121
    30	 Python 1.5.1: 20121
    31	    Python 1.5.2: 20121
    32	    Python 1.6:   50428
    33	    Python 2.0:   50823
    34	    Python 2.0.1: 50823
    35	    Python 2.1:   60202
    36	    Python 2.1.1: 60202
    37	    Python 2.1.2: 60202
    38	    Python 2.2:   60717
    39	    Python 2.3a0: 62011
    40	    Python 2.3a0: 62021
    41	    Python 2.3a0: 62011 (!)
    42	    Python 2.4a0: 62041
    43	    Python 2.4a3: 62051
    44	    Python 2.4b1: 62061
    45	    Python 2.5a0: 62071
    46	    Python 2.5a0: 62081 (ast-branch)
    47	    Python 2.5a0: 62091 (with)
    48	    Python 2.5a0: 62092 (changed WITH_CLEANUP opcode)
    49	    Python 2.5b3: 62101 (fix wrong code: for x, in ...)
    50	    Python 2.5b3: 62111 (fix wrong code: x += yield)
    51	    Python 2.5c1: 62121 (fix wrong lnotab with for loops and
    52	                         storing constants that should have been removed)
    53	    Python 2.5c2: 62131 (fix wrong code: for x, in ... in listcomp/genexp)
    54	    Python 2.6a0: 62151 (peephole optimizations and STORE_MAP opcode)
    55	    Python 2.6a1: 62161 (WITH_CLEANUP optimization)
    56	    Python 2.7a0: 62171 (optimize list comprehensions/change LIST_APPEND)
    57	    Python 2.7a0: 62181 (optimize conditional branches:
    58	                         introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE)
    59	    Python 2.7a0  62191 (introduce SETUP_WITH)
    60	    Python 2.7a0  62201 (introduce BUILD_SET)
    61	    Python 2.7a0  62211 (introduce MAP_ADD and SET_ADD)
    62	    Python 3000:   3000
    63	                   3010 (removed UNARY_CONVERT)
    64	                   3020 (added BUILD_SET)
    65	                   3030 (added keyword-only parameters)
    66	                   3040 (added signature annotations)
    67	                   3050 (print becomes a function)
    68	                   3060 (PEP 3115 metaclass syntax)
    69	                   3061 (string literals become unicode)
    70	                   3071 (PEP 3109 raise changes)
    71	                   3081 (PEP 3137 make __file__ and __name__ unicode)
    72	                   3091 (kill str8 interning)
    73	                   3101 (merge from 2.6a0, see 62151)
    74	                   3103 (__file__ points to source file)
    75	    Python 3.0a4: 3111 (WITH_CLEANUP optimization).
    76	    Python 3.0b1: 3131 (lexical exception stacking, including POP_EXCEPT
    77	                          #3021)
    78	    Python 3.1a1: 3141 (optimize list, set and dict comprehensions:
    79	                        change LIST_APPEND and SET_ADD, add MAP_ADD #2183)
    80	    Python 3.1a1: 3151 (optimize conditional branches:
    81	                        introduce POP_JUMP_IF_FALSE and POP_JUMP_IF_TRUE
    82	                          #4715)
    83	    Python 3.2a1: 3160 (add SETUP_WITH #6101)
    84	    Python 3.2a2: 3170 (add DUP_TOP_TWO, remove DUP_TOPX and ROT_FOUR #9225)
    85	    Python 3.2a3  3180 (add DELETE_DEREF #4617)
    86	    Python 3.3a1  3190 (__class__ super closure changed)
    87	    Python 3.3a1  3200 (PEP 3155 __qualname__ added #13448)
    88	    Python 3.3a1  3210 (added size modulo 2**32 to the pyc header #13645)
    89	    Python 3.3a2  3220 (changed PEP 380 implementation #14230)
    90	    Python 3.3a4  3230 (revert changes to implicit __class__ closure #14857)
    91	    Python 3.4a1  3250 (evaluate positional default arguments before
    92	                       keyword-only defaults #16967)
    93	    Python 3.4a1  3260 (add LOAD_CLASSDEREF; allow locals of class to override
    94	                       free vars #17853)
    95	    Python 3.4a1  3270 (various tweaks to the __class__ closure #12370)
    96	    Python 3.4a1  3280 (remove implicit class argument)
    97	    Python 3.4a4  3290 (changes to __qualname__ computation #19301)
    98	    Python 3.4a4  3300 (more changes to __qualname__ computation #19301)
    99	    Python 3.4rc2 3310 (alter __qualname__ computation #20625)
   100	    Python 3.5a1  3320 (PEP 465: Matrix multiplication operator #21176)
   101	    Python 3.5b1  3330 (PEP 448: Additional Unpacking Generalizations #2292)
   102	    Python 3.5b2  3340 (fix dictionary display evaluation order #11205)
   103	    Python 3.5b3  3350 (add GET_YIELD_FROM_ITER opcode #24400)
   104	    Python 3.5.2  3351 (fix BUILD_MAP_UNPACK_WITH_CALL opcode #27286)
   105	    Python 3.6a0  3360 (add FORMAT_VALUE opcode #25483)
   106	    Python 3.6a1  3361 (lineno delta of code.co_lnotab becomes signed #26107)
   107	    Python 3.6a2  3370 (16 bit wordcode #26647)
   108	    Python 3.6a2  3371 (add BUILD_CONST_KEY_MAP opcode #27140)
   109	    Python 3.6a2  3372 (MAKE_FUNCTION simplification, remove MAKE_CLOSURE
   110	                        #27095)
   111	    Python 3.6b1  3373 (add BUILD_STRING opcode #27078)
   112	    Python 3.6b1  3375 (add SETUP_ANNOTATIONS and STORE_ANNOTATION opcodes
   113	                        #27985)
   114	    Python 3.6b1  3376 (simplify CALL_FUNCTIONs & BUILD_MAP_UNPACK_WITH_CALL
   115	                          #27213)
   116	    Python 3.6b1  3377 (set __class__ cell from type.__new__ #23722)
   117	    Python 3.6b2  3378 (add BUILD_TUPLE_UNPACK_WITH_CALL #28257)
   118	    Python 3.6rc1 3379 (more thorough __class__ validation #23722)
   119	    Python 3.7a1  3390 (add LOAD_METHOD and CALL_METHOD opcodes #26110)
   120	    Python 3.7a2  3391 (update GET_AITER #31709)
   121	    Python 3.7a4  3392 (PEP 552: Deterministic pycs #31650)
   122	    Python 3.7b1  3393 (remove STORE_ANNOTATION opcode #32550)
   123	    Python 3.7b5  3394 (restored docstring as the first stmt in the body;
   124	                        this might affected the first line number #32911)
   125	    Python 3.8a1  3400 (move frame block handling to compiler #17611)
   126	    Python 3.8a1  3401 (add END_ASYNC_FOR #33041)
   127	    Python 3.8a1  3410 (PEP570 Python Positional-Only Parameters #36540)
   128	    Python 3.8b2  3411 (Reverse evaluation order of key: value in dict
   129	                        comprehensions #35224)
   130	    Python 3.8b2  3412 (Swap the position of positional args and positional
   131	                        only args in ast.arguments #37593)
   132	    Python 3.8b4  3413 (Fix "break" and "continue" in "finally" #37830)
   133	    Python 3.9a0  3420 (add LOAD_ASSERTION_ERROR #34880)
   134	    Python 3.9a0  3421 (simplified bytecode for with blocks #32949)
   135	    Python 3.9a0  3422 (remove BEGIN_FINALLY, END_FINALLY, CALL_FINALLY, POP_FINALLY bytecodes #33387)
   136	    Python 3.9a2  3423 (add IS_OP, CONTAINS_OP and JUMP_IF_NOT_EXC_MATCH bytecodes #39156)
   137	    Python 3.9a2  3424 (simplify bytecodes for *value unpacking)
   138	    Python 3.9a2  3425 (simplify bytecodes for **value unpacking)
   139	    Python 3.10a1 3430 (Make 'annotations' future by default)
   140	    Python 3.10a1 3431 (New line number table format -- PEP 626)
   141	    Python 3.10a2 3432 (Function annotation for MAKE_FUNCTION is changed from dict to tuple bpo-42202)
   142	    Python 3.10a2 3433 (RERAISE restores f_lasti if oparg != 0)
   143	    Python 3.10a6 3434 (PEP 634: Structural Pattern Matching)
   144	    Python 3.10a7 3435 Use instruction offsets (as opposed to byte offsets).
   145	    Python 3.10b1 3436 (Add GEN_START bytecode #43683)
   146	    Python 3.10b1 3437 (Undo making 'annotations' future by default - We like to dance among core devs!)
   147	    Python 3.10b1 3438 Safer line number table handling.
   148	    Python 3.10b1 3439 (Add ROT_N)
   149	    Python 3.11a1 3450 Use exception table for unwinding ("zero cost" exception handling)
   150	    Python 3.11a1 3451 (Add CALL_METHOD_KW)
   151	    Python 3.11a1 3452 (drop nlocals from marshaled code objects)
   152	    Python 3.11a1 3453 (add co_fastlocalnames and co_fastlocalkinds)
   153	    Python 3.11a1 3454 (compute cell offsets relative to locals bpo-43693)
   154	    Python 3.11a1 3455 (add MAKE_CELL bpo-43693)
   155	    Python 3.11a1 3456 (interleave cell args bpo-43693)
   156	    Python 3.11a1 3457 (Change localsplus to a bytes object bpo-43693)
   157	    Python 3.11a1 3458 (imported objects now don't use LOAD_METHOD/CALL_METHOD)
   158	    Python 3.11a1 3459 (PEP 657: add end line numbers and column offsets for instructions)
   159	    Python 3.11a1 3460 (Add co_qualname field to PyCodeObject bpo-44530)
   160	    Python 3.11a1 3461 (JUMP_ABSOLUTE must jump backwards)
   161	    Python 3.11a2 3462 (bpo-44511: remove COPY_DICT_WITHOUT_KEYS, change
   162	                        MATCH_CLASS and MATCH_KEYS, and add COPY)
   163	    Python 3.11a3 3463 (bpo-45711: JUMP_IF_NOT_EXC_MATCH no longer pops the
   164	                        active exception)
   165	    Python 3.11a3 3464 (bpo-45636: Merge numeric BINARY_*INPLACE_* into
   166	                        BINARY_OP)
   167	    Python 3.11a3 3465 (Add COPY_FREE_VARS opcode)
   168	    Python 3.11a4 3466 (bpo-45292: PEP-654 except*)
   169	    Python 3.11a4 3467 (Change CALL_xxx opcodes)
   170	    Python 3.11a4 3468 (Add SEND opcode)
   171	    Python 3.11a4 3469 (bpo-45711: remove type, traceback from exc_info)
   172	    Python 3.11a4 3470 (bpo-46221: PREP_RERAISE_STAR no longer pushes lasti)
   173	    Python 3.11a4 3471 (bpo-46202: remove pop POP_EXCEPT_AND_RERAISE)
   174	    Python 3.11a4 3472 (bpo-46009: replace GEN_START with POP_TOP)
   175	    Python 3.11a4 3473 (Add POP_JUMP_IF_NOT_NONE/POP_JUMP_IF_NONE opcodes)
   176	    Python 3.11a4 3474 (Add RESUME opcode)
   177	    Python 3.11a5 3475 (Add RETURN_GENERATOR opcode)
   178	    Python 3.11a5 3476 (Add ASYNC_GEN_WRAP opcode)
   179	    Python 3.11a5 3477 (Replace DUP_TOP/DUP_TOP_TWO with COPY and
   180	                        ROT_TWO/ROT_THREE/ROT_FOUR/ROT_N with SWAP)
   181	    Python 3.11a5 3478 (New CALL opcodes)
   182	    Python 3.11a5 3479 (Add PUSH_NULL opcode)
   183	    Python 3.11a5 3480 (New CALL opcodes, second iteration)
   184	    Python 3.11a5 3481 (Use inline cache for BINARY_OP)
   185	    Python 3.11a5 3482 (Use inline caching for UNPACK_SEQUENCE and LOAD_GLOBAL)
   186	    Python 3.11a5 3483 (Use inline caching for COMPARE_OP and BINARY_SUBSCR)
   187	    Python 3.11a5 3484 (Use inline caching for LOAD_ATTR, LOAD_METHOD, and
   188	                        STORE_ATTR)
   189	    Python 3.11a5 3485 (Add an oparg to GET_AWAITABLE)
   190	    Python 3.11a6 3486 (Use inline caching for PRECALL and CALL)
   191	    Python 3.11a6 3487 (Remove the adaptive "oparg counter" mechanism)
   192	    Python 3.11a6 3488 (LOAD_GLOBAL can push additional NULL)
   193	    Python 3.11a6 3489 (Add JUMP_BACKWARD, remove JUMP_ABSOLUTE)
   194	    Python 3.11a6 3490 (remove JUMP_IF_NOT_EXC_MATCH, add CHECK_EXC_MATCH)
   195	    Python 3.11a6 3491 (remove JUMP_IF_NOT_EG_MATCH, add CHECK_EG_MATCH,
   196	                        add JUMP_BACKWARD_NO_INTERRUPT, make JUMP_NO_INTERRUPT virtual)
   197	    Python 3.11a7 3492 (make POP_JUMP_IF_NONE/NOT_NONE/TRUE/FALSE relative)
   198	    Python 3.11a7 3493 (Make JUMP_IF_TRUE_OR_POP/JUMP_IF_FALSE_OR_POP relative)
   199	    Python 3.11a7 3494 (New location info table)
   200	    Python 3.11b4 3495 (Set line number of module's RESUME instr to 0 per PEP 626)
   201	    Python 3.12a1 3500 (Remove PRECALL opcode)
   202	    Python 3.12a1 3501 (YIELD_VALUE oparg == stack_depth)
   203	    Python 3.12a1 3502 (LOAD_FAST_CHECK, no NULL-check in LOAD_FAST)
   204	    Python 3.12a1 3503 (Shrink LOAD_METHOD cache)
   205	    Python 3.12a1 3504 (Merge LOAD_METHOD back into LOAD_ATTR)
   206	    Python 3.12a1 3505 (Specialization/Cache for FOR_ITER)
   207	    Python 3.12a1 3506 (Add BINARY_SLICE and STORE_SLICE instructions)
   208	    Python 3.12a1 3507 (Set lineno of module's RESUME to 0)
   209	    Python 3.12a1 3508 (Add CLEANUP_THROW)
   210	    Python 3.12a1 3509 (Conditional jumps only jump forward)
   211	    Python 3.12a2 3510 (FOR_ITER leaves iterator on the stack)
   212	    Python 3.12a2 3511 (Add STOPITERATION_ERROR instruction)
   213	    Python 3.12a2 3512 (Remove all unused consts from code objects)
   214	    Python 3.12a4 3513 (Add CALL_INTRINSIC_1 instruction, removed STOPITERATION_ERROR, PRINT_EXPR, IMPORT_STAR)
   215	    Python 3.12a4 3514 (Remove ASYNC_GEN_WRAP, LIST_TO_TUPLE, and UNARY_POSITIVE)
   216	    Python 3.12a5 3515 (Embed jump mask in COMPARE_OP oparg)
   217	    Python 3.12a5 3516 (Add COMPARE_AND_BRANCH instruction)
   218	    Python 3.12a5 3517 (Change YIELD_VALUE oparg to exception block depth)
   219	    Python 3.12a6 3518 (Add RETURN_CONST instruction)
   220	    Python 3.12a6 3519 (Modify SEND instruction)
   221	    Python 3.12a6 3520 (Remove PREP_RERAISE_STAR, add CALL_INTRINSIC_2)
   222	    Python 3.12a7 3521 (Shrink the LOAD_GLOBAL caches)
   223	    Python 3.12a7 3522 (Removed JUMP_IF_FALSE_OR_POP/JUMP_IF_TRUE_OR_POP)
   224	    Python 3.12a7 3523 (Convert COMPARE_AND_BRANCH back to COMPARE_OP)
   225	    Python 3.12a7 3524 (Shrink the BINARY_SUBSCR caches)
   226	    Python 3.12b1 3525 (Shrink the CALL caches)
   227	    Python 3.12b1 3526 (Add instrumentation support)
   228	    Python 3.12b1 3527 (Add LOAD_SUPER_ATTR)
   229	    Python 3.12b1 3528 (Add LOAD_SUPER_ATTR_METHOD specialization)
   230	    Python 3.12b1 3529 (Inline list/dict/set comprehensions)
   231	    Python 3.12b1 3530 (Shrink the LOAD_SUPER_ATTR caches)
   232	    Python 3.12b1 3531 (Add PEP 695 changes)
   233	    Python 3.13a1 3550 (Plugin optimizer support)
   234	    Python 3.13a1 3551 (Compact superinstructions)
   235	    Python 3.13a1 3552 (Remove LOAD_FAST__LOAD_CONST and LOAD_CONST__LOAD_FAST)
   236	    Python 3.13a1 3553 (Add SET_FUNCTION_ATTRIBUTE)
   237	    Python 3.13a1 3554 (more efficient bytecodes for f-strings)
   238	    Python 3.13a1 3555 (generate specialized opcodes metadata from bytecodes.c)
   239	    Python 3.13a1 3556 (Convert LOAD_CLOSURE to a pseudo-op)
   240	    Python 3.13a1 3557 (Make the conversion to boolean in jumps explicit)
   241	    Python 3.13a1 3558 (Reorder the stack items for CALL)
   242	    Python 3.13a1 3559 (Generate opcode IDs from bytecodes.c)
   243	    Python 3.13a1 3560 (Add RESUME_CHECK instruction)
   244	    Python 3.13a1 3561 (Add cache entry to branch instructions)
   245	    Python 3.13a1 3562 (Assign opcode IDs for internal ops in separate range)
   246	    Python 3.13a1 3563 (Add CALL_KW and remove KW_NAMES)
   247	    Python 3.13a1 3564 (Removed oparg from YIELD_VALUE, changed oparg values of RESUME)
   248	    Python 3.13a1 3565 (Oparg of YIELD_VALUE indicates whether it is in a yield-from)
   249	    Python 3.13a1 3566 (Emit JUMP_NO_INTERRUPT instead of JUMP for non-loop no-lineno cases)
   250	    Python 3.13a1 3567 (Reimplement line number propagation by the compiler)
   251	    Python 3.13a1 3568 (Change semantics of END_FOR)
   252	    Python 3.13a5 3569 (Specialize CONTAINS_OP)
   253	    Python 3.13a6 3570 (Add __firstlineno__ class attribute)
   254	    Python 3.13b1 3571 (Fix miscompilation of private names in generic classes)
   255	    Python 3.14a1 3600 (Add LOAD_COMMON_CONSTANT)
   256	    Python 3.14a1 3601 (Fix miscompilation of private names in generic classes)
   257	    Python 3.14a1 3602 (Add LOAD_SPECIAL. Remove BEFORE_WITH and BEFORE_ASYNC_WITH)
   258	    Python 3.14a1 3603 (Remove BUILD_CONST_KEY_MAP)
   259	    Python 3.14a1 3604 (Do not duplicate test at end of while statements)
   260	    Python 3.14a1 3605 (Move ENTER_EXECUTOR to opcode 255)
   261	    Python 3.14a1 3606 (Specialize CALL_KW)
   262	    Python 3.14a1 3607 (Add pseudo instructions JUMP_IF_TRUE/FALSE)
   263	    Python 3.14a1 3608 (Add support for slices)
   264	    Python 3.14a2 3609 (Add LOAD_SMALL_INT and LOAD_CONST_IMMORTAL instructions, remove RETURN_CONST)
   265	    Python 3.14a4 3610 (Add VALUE_WITH_FAKE_GLOBALS format to annotationlib)
   266	    Python 3.14a4 3611 (Add NOT_TAKEN instruction)
   267	    Python 3.14a4 3612 (Add POP_ITER and INSTRUMENTED_POP_ITER)
   268	    Python 3.14a4 3613 (Add LOAD_CONST_MORTAL instruction)
   269	    Python 3.14a5 3614 (Add BINARY_OP_EXTEND)
   270	    Python 3.14a5 3615 (CALL_FUNCTION_EX always take a kwargs argument)
   271	    Python 3.14a5 3616 (Remove BINARY_SUBSCR and family. Make them BINARY_OPs)
   272	    Python 3.14a6 3617 (Branch monitoring for async for loops)
   273	    Python 3.14a6 3618 (Add oparg to END_ASYNC_FOR)
   274	    Python 3.14a6 3619 (Renumber RESUME opcode from 149 to 128)
   275	    Python 3.14a6 3620 (Optimize bytecode for all/any/tuple called on a genexp)
   276	    Python 3.14a7 3621 (Optimize LOAD_FAST opcodes into LOAD_FAST_BORROW)
   277	    Python 3.14a7 3622 (Store annotations in different class dict keys)
   278	    Python 3.14a7 3623 (Add BUILD_INTERPOLATION & BUILD_TEMPLATE opcodes)
   279	    Python 3.14b1 3624 (Don't optimize LOAD_FAST when local is killed by DELETE_FAST)
   280	    Python 3.14b3 3625 (Fix handling of opcodes that may leave operands on the stack when optimizing LOAD_FAST)
   281	    Python 3.14rc2 3626 (Fix missing exception handlers in logical expression)
   282	    Python 3.14rc3 3627 (Fix miscompilation of some module-level annotations)
   283	
   284	    Python 3.15 will start with 3650
   285	
   286	    Please don't copy-paste the same pre-release tag for new entries above!!!
   287	    You should always use the *upcoming* tag. For example, if 3.12a6 came out
   288	    a week ago, I should put "Python 3.12a7" next to my new magic number.
   289	
   290	Whenever PYC_MAGIC_NUMBER is changed, the ranges in the magic_values array in
   291	PC/launcher.c must also be updated.
   292	
   293	*/
   294	
   295	#define PYC_MAGIC_NUMBER 3627
   296	/* This is equivalent to converting PYC_MAGIC_NUMBER to 2 bytes
   297	   (little-endian) and then appending b'\r\n'. */
   298	#define PYC_MAGIC_NUMBER_TOKEN \
   299	    ((uint32_t)PYC_MAGIC_NUMBER | ((uint32_t)'\r' << 16) | ((uint32_t)'\n' << 24))
   300	
   301	
   302	#ifdef __cplusplus
   303	}
   304	#endif
   305	#endif  // !Py_INTERNAL_MAGIC_NUMBER_H