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| author | Benjamin Peterson <benjamin@python.org> | 2017-12-09 18:26:52 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2017-12-09 18:26:52 (GMT) |
| commit | 42aa93b8ff2f7879282b06efc73a31ec7785e602 (patch) | |
| tree | 92ee301e1f487a7f5aa8ec78a36ebc50d21d6ec9 /Misc | |
| parent | 28d8d14013ade0657fed4673f5fa3c08eb2b1944 (diff) | |
| download | cpython-42aa93b8ff2f7879282b06efc73a31ec7785e602.zip cpython-42aa93b8ff2f7879282b06efc73a31ec7785e602.tar.gz cpython-42aa93b8ff2f7879282b06efc73a31ec7785e602.tar.bz2 | |
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.
Diffstat (limited to 'Misc')
| -rw-r--r-- | Misc/NEWS.d/next/Core and Builtins/2017-11-26-14-38-44.bpo-31650.JWf_Im.rst | 3 | ||||
| -rw-r--r-- | Misc/python.man | 8 |
2 files changed, 11 insertions, 0 deletions
diff --git a/Misc/NEWS.d/next/Core and Builtins/2017-11-26-14-38-44.bpo-31650.JWf_Im.rst b/Misc/NEWS.d/next/Core and Builtins/2017-11-26-14-38-44.bpo-31650.JWf_Im.rst new file mode 100644 index 0000000..b653f0b --- /dev/null +++ b/Misc/NEWS.d/next/Core and Builtins/2017-11-26-14-38-44.bpo-31650.JWf_Im.rst @@ -0,0 +1,3 @@ +Implement PEP 552 (Deterministic pycs). Python now supports invalidating +bytecode cache files bashed on a source content hash rather than source +last-modified time. diff --git a/Misc/python.man b/Misc/python.man index b411029..0f38c5b 100644 --- a/Misc/python.man +++ b/Misc/python.man @@ -74,6 +74,11 @@ python \- an interpreted, interactive, object-oriented programming language ] .br [ +.B \--check-hash-based-pycs +\'default\'|\'always\'|\'never\' +] +.br + [ .B \-c .I command | @@ -123,6 +128,9 @@ Specify the command to execute (see next section). This terminates the option list (following options are passed as arguments to the command). .TP +.BI "\-\-check-hash-based-pycs " mode +Configure how Python evaluates the up-to-dateness of hash-based .pyc files. +.TP .B \-d Turn on parser debugging output (for expert only, depending on compilation options). |