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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.
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33 changed files with 3364 additions and 2505 deletions
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@ -51,7 +51,8 @@ void _PyOS_ResetGetOpt(void)
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opt_ptr = L"";
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}
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int _PyOS_GetOpt(int argc, wchar_t **argv, wchar_t *optstring)
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int _PyOS_GetOpt(int argc, wchar_t **argv, wchar_t *optstring,
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const _PyOS_LongOption *longopts, int *longindex)
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{
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wchar_t *ptr;
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wchar_t option;
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@ -86,13 +87,41 @@ int _PyOS_GetOpt(int argc, wchar_t **argv, wchar_t *optstring)
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return 'V';
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}
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opt_ptr = &argv[_PyOS_optind++][1];
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}
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if ((option = *opt_ptr++) == L'\0')
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return -1;
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if (option == L'-') {
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// Parse long option.
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if (*opt_ptr == L'\0') {
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fprintf(stderr, "expected long option\n");
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return -1;
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}
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*longindex = 0;
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const _PyOS_LongOption *opt;
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for (opt = &longopts[*longindex]; opt->name; opt = &longopts[++(*longindex)]) {
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if (!wcscmp(opt->name, opt_ptr))
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break;
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}
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if (!opt->name) {
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fprintf(stderr, "unknown option %ls\n", argv[_PyOS_optind - 1]);
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return '_';
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}
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opt_ptr = L"";
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if (!opt->has_arg) {
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return opt->val;
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}
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if (_PyOS_optind >= argc) {
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fprintf(stderr, "Argument expected for the %ls options\n",
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argv[_PyOS_optind - 1]);
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return '_';
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}
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_PyOS_optarg = argv[_PyOS_optind++];
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return opt->val;
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}
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if (option == 'J') {
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if (_PyOS_opterr)
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fprintf(stderr, "-J is reserved for Jython\n");
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