From 42aa93b8ff2f7879282b06efc73a31ec7785e602 Mon Sep 17 00:00:00 2001 From: Benjamin Peterson Date: Sat, 9 Dec 2017 10:26:52 -0800 Subject: closes bpo-31650: PEP 552 (Deterministic pycs) implementation (#4575) Python now supports checking bytecode cache up-to-dateness with a hash of the source contents rather than volatile source metadata. See the PEP for details. While a fairly straightforward idea, quite a lot of code had to be modified due to the pervasiveness of pyc implementation details in the codebase. Changes in this commit include: - The core changes to importlib to understand how to read, validate, and regenerate hash-based pycs. - Support for generating hash-based pycs in py_compile and compileall. - Modifications to our siphash implementation to support passing a custom key. We then expose it to importlib through _imp. - Updates to all places in the interpreter, standard library, and tests that manually generate or parse pyc files to grok the new format. - Support in the interpreter command line code for long options like --check-hash-based-pycs. - Tests and documentation for all of the above. --- Python/pythonrun.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'Python/pythonrun.c') diff --git a/Python/pythonrun.c b/Python/pythonrun.c index b5285754ab..26f74c80d0 100644 --- a/Python/pythonrun.c +++ b/Python/pythonrun.c @@ -1053,7 +1053,8 @@ run_pyc_file(FILE *fp, const char *filename, PyObject *globals, "Bad magic number in .pyc file"); return NULL; } - /* Skip mtime and size */ + /* Skip the rest of the header. */ + (void) PyMarshal_ReadLongFromFile(fp); (void) PyMarshal_ReadLongFromFile(fp); (void) PyMarshal_ReadLongFromFile(fp); if (PyErr_Occurred()) -- cgit v1.2.1