gcc-python-plugin August 2011

gcc-python-plugin@lists.stg.fedorahosted.org

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gcc-python-plugin finds its first bug in itself
by David Malcolm 05 Aug '11

05 Aug '11

gcc-python-plugin [1] now provides a gcc-with-cpychecker harness that runs gcc with an additional pass that checks CPython API calls (internally, it's using the gcc python plugin to run a python script that does the work). I tried rebuilding the plugin using make CC=../other-build/gcc-with-cpychecker and it found a genuine bug in itself: within this code: 350 PyObject * 351 gcc_Pass_get_by_name(PyObject *cls, PyObject *args, PyObject *kwargs) 352 { 353 const char *name; 354 char *keywords[] = {"name", 355 NULL}; 356 struct opt_pass *result; 357 358 if (!PyArg_ParseTupleAndKeywords(args, kwargs, 359 "s|get_by_name", keywords, 360 &name)) { 361 return NULL; 362 } 363 [...snip...] it found this problem: gcc-python-pass.c: In function ‘gcc_Pass_get_by_name’: gcc-python-pass.c:358:37: error: unknown format char in "s|get_by_name": 'g' [-fpermissive] It turned out that I'd typo-ed the format code: I was erroneously using "|" (signifying that optional args follow), when I meant to use ":" (signifying that the rest of the string is the name of the function, for use in error messages) [2]. Fixed in git; there are a few false positives, which I'm working on fixing now. I'm in two minds about whether this (minor) milestone is one I should mention in public, but I guess it's proof that having a static checker for this kind of mistake is worthwhile :) Dave [1] https://fedorahosted.org/gcc-python-plugin/ [2] fwiw, the API that it's checking is here: http://docs.python.org/c-api/arg.html

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ANN: gcc-python-plugin 0.6
by David Malcolm 02 Aug '11

02 Aug '11

gcc-python-plugin is a plugin for GCC 4.6 onwards which embeds the CPython interpreter within GCC, allowing you to write new compiler warnings in Python, generate code visualizations, etc. Tarball releases are available at: https://fedorahosted.org/releases/g/c/gcc-python-plugin/ Prebuilt-documentation can be seen at: http://readthedocs.org/docs/gcc-python-plugin/en/latest/index.html Project homepage: https://fedorahosted.org/gcc-python-plugin/ What's new in v0.6: - It's now possible to create new gcc passes in Python, rather than just wire up callbacks to existing passes. See: http://readthedocs.org/docs/gcc-python-plugin/en/latest/passes.html#creatin… - GCC's callgraph information is now visible via a Python API. See: http://readthedocs.org/docs/gcc-python-plugin/en/latest/callgraph.html - GCC's Register Transfer Language is now visible via a Python API (albeit a rather primitive one so far). - Improvements to Python 3 support (the selftests are now built and run against the version of Python that the plugin was compiled against, rather than hardcoding Python 2.7; various Python 3 and --with-py-debug compatibility issues that this shook out are now fixed). - Various other minor fixes Enjoy! Dave

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gcc-python-plugin August 2011